Abstract: The present invention relates to a fuel pump assembly for a motor vehicle, the assembly being characterized by the fact that it comprises a damping device (42) formed on the outlet of a pump (20) by a sleeve made of compressible material.

Abstract: A fuel control system is provided. Fuel is delivered into a main canister from a low-pressure pump, where it gathers in a reservoir or bottom area. The fuel in the reservoir is taken up by a small high-pressure pump inside the housing, which drives the fuel to the fuel injectors of an engine. The low-pressure pump has a flow rate exceeding that of the high-pressure pump. A vapor trap captures accumulating fuel vapor. Volumetric excess fuel and vapor are vented back to the fuel tank and atmospheric pressure. Vapor lock is reduced or avoided, and particulate and water filters are provided to avoid contamination.

Abstract: A filter element is made of a mold body of filter materials and sandwiched between protrusions of a pump casing and a flange, so that the filter element may be assembled easily with the pump casing and the flange. The filter element is disposed within a fuel tank together with a fuel pump and a pressure regulator. Fuel discharged from the fuel pump is led laterally through fuel communication passages along the fuel inlet side surface of the filter element, so that the fuel may flow uniformly across the filter element.

Abstract: A fuel-feeding unit for supplying a fuel from a fuel tank is described which has a particularly compact structure. The described fuel-feeding unit has a fuel pump driven by an electrical motor, a low pressure side preliminary fuel filter and a high pressure side main fuel filter arranged in a housing. The housing has a central compartment for the electrical motor and a circular compartment surrounding the central compartment in which the main fuel filter is located. The housing is closed and sealed by means of a housing cover that has a fuel outlet connector and an E-connector for electrical power lines. The pump impeller of the fuel pump arranged in a pump compartment inside the housing has a diameter which is larger than the diameter of the central compartment and the fuel is fed from the fuel pump directly into the circular compartment.

Abstract: A feeding device for fuel having an electric motor, a feed pump which is driven by the electric motor, a filter arranged in a fuel stream of the feed pump, a housing accommodating the electric motor, the feed pump and the filter, a fuel tank for a fuel supply and provided with a tank flange which forms a cover, tubular connections for guiding a fuel stream in a feeding direction and to the tank flange, the tubular connections being composed of an electrically conductive plastic and producing a throughgoing electrical ground connection of all components through which a fuel flows.

Abstract: A new fuel metering system for selectively controlling the rack pressure and the volume of fuel available to a diesel engine. The inventive device includes a fuel inlet line in fluid communication with a fuel pump outlet line for receiving fuel flowing from the fuel pump, a metering valve coupled in fluid communication with the fuel inlet line, the metering valve having a valve member for controlling the flow of fuel therethrough, the metering valve being coupled in fluid communication with a return line for receiving the metered fuel flowing through the metering valve, and a solenoid valve coupled in fluid communication with the metering valve and the fuel inlet line, the solenoid valve being operable to open and close fuel flow through the metering valve.

Abstract: A passive fuel delivery module adapted for installation in fuel tanks of vehicles. The passive fuel delivery module maintains a minimum fuel reserve in a fuel reserve reservoir for the fuel pump and includes primary and secondary fuel filters for filtering both the tank fuel and reservoir fuel. The passive fuel delivery module further includes a suspension mechanism which enables the fuel delivery module to vertically displace with the bottom surface of the fuel tank.

Abstract: A fuel filter assembly 16 for a fuel system for an internal combustion engine 10 which comprises a fuel filter housing 16 supporting a filter material 20 in a filter chamber 18 for disposition in a fuel line between a fuel tank 12 and an injector pump 14, and a fuel reservoir 22 disposed downstream from the filter chamber 18 for storing a volume of fuel. The assembly is characterized by an inlet valve 24 controlling fuel flow between the filter chamber 18 and the reservoir 22 for maintaining a predetermined volume of fuel in the reservoir 22 to provide a substantially constant fuel pressure to the injector pump 14. A float 26 is disposed in the reservoir 22 for opening the valve 24 in response to the fuel being below the predetermined volume and closing the valve 24 in response to the fuel being above the predetermined volume.

Abstract: A fuel supply apparatus having a cross sectional area S.sub.0 of a first low pressure fuel passage which is connected to a high pressure pump and which has a pressure regulator, a cross sectional area S.sub.1 of an orifice formed between the first low pressure fuel passage and a second low pressure fuel passage, and a cross sectional area S.sub.2 of the second low pressure fuel passage for supplying the low pressure fuel to the first low pressure fuel passage. Those cross sectional areas are set to satisfy a relationship of S.sub.1 <S.sub.0 <S.sub.2 such that the pressure pulsation generated at the pressure regulator is reduced, and the noise produced by the fuel supply apparatus is reduced.

Abstract: A vehicular fuel supplying apparatus comprising an in-tank type fuel pump mounted within the fuel tank from an opening in a bottom wall of a fuel tank. A fuel flowing out prevention valve 21 is connected between a discharge port 7a of a fuel pump 7 and a vehicle body side pipe 16 to an engine. A valve 25 seating on a seal surface and having a coil spring 28 is disposed within the fuel flowing out prevention valve 21 to provide a valve function, the valve opening pressure of the fuel flowing out prevention valve 21 from the side of the fuel pump is set to be greater than a total maximum value of a fuel head pressure inside of the fuel tank and an internal pressure of the fuel tank and is set smaller than a fuel discharge pressure at the fuel pump 7.

Abstract: A fuel delivery system for vehicles with more than one fuel tank or a single tank with separate sections under at least some fuel level conditions. The system has an electric fuel pump disposed in the fuel container and a jet pump connected to the electric fuel pump with fuel pickups connected to the jet pump through a siphon. The electric fuel pump powers the jet pump to fill the siphon with liquid fuel and draw fuel through the pickups which are spaced apart in separate sections of the fuel container. When the siphon is completely filled with liquid fuel and the jet pump is operating, any difference in the heads or fuel levels in the sections of the fuel container will cause fuel to flow through the siphon from the section with the greater head to the other section of the tank. This flow, due to the difference in pressure associated with different fuel levels, continues until the fuel levels and, hence, the pressures are substantially the same in each section of the container.

Abstract: A fuel pump module disposed within a vehicle fuel tank has a fuel pump therein to draw fuel from the fuel tank and deliver that fuel under pressure to the vehicle engine, and a jet pump driven by the fuel pump to lower the pressure within the module to draw fuel from the fuel tank through a filtered inlet of the module when the fuel pump is operating. When the fuel pump is not operating, such as when the vehicle is not in use, the jet pump ceases to operate and the pressure within the module returns to that of the fuel tank. When the level of fuel in the fuel tank is lower than that within the fuel pump module and the pump is turned off, a portion of the fuel within the module returns to the fuel tank through the filtered inlet of the module thereby dislodging at least some of the contaminants trapped by the filter.

Abstract: A fuel module including a fuel filter located on a valve block 10 and having a replaceable filter insert 14 in a filter housing 11. The fuel module also has a manually-operable feed pump 31, a connection 8, located on the valve block 10, for fuel supply, a connection C for fuel return, two connections A, D for a mechanical feed pump and a connection E to the injector pump, the manually-operable feed pump 31 containing two identically-constructed valves 23, 24.

Abstract: A control system for a fuel delivery system regulates fuel pressure on the filtered side of a fuel filter and relieves excessive primary pump flow from the unfiltered side of the filter. The valve also selectively provides warm fuel to de-wax the fuel filter after a cold start. Once wax build-up is no longer an issue, the warm fuel is directed to a fuel cooler or a heat sink, such as the fuel tank. The control system prioritizes the maintenance of filtered fuel pressure over maximizing fuel returned for cooling. Also, the fuel filter is protected from excessive fuel pressure differential.

Abstract: A fuel feeding module has a fuel pump, a coarse fuel filter, a fine fuel filter, a storage cup to be arranged on a bottom of a fuel tank, the fuel pump with the coarse fuel filter being surrounded by the storage cup, the storage cup having a wall which at least in portions is formed double-walled, the individual walls together forming a completely enclosed intermediate chamber in which the fine fuel filter is arranged, the intermediate chamber having a supply connection connected with a pressure connection of the fuel pump in a region of the fine filter and also having a discharge connection in a region of the fine filter.

Abstract: A fuel supply system for an engine powering an outboard motor is disclosed. The fuel supply system includes a first pump for delivering fuel from a fuel supply to a fuel reservoir located at the motor. Another pump delivers fuel from the reservoir to a charge former. The rate of fuel delivery into the reservoir is regulated by a valve based upon the level of the fuel within the reservoir. A flow rate sensor is provided for sensing the fuel flow rate into the reservoir. The fuel system is arranged to limit a change in sensed fuel flow rate when a position of the motor is changed, such as when the motor is trimmed.

Abstract: A fuel injection system for internal combustion engines, having a high-pressure pump, whose pump work chamber can be made to communicate on the intake side with a fuel tank via a supply line and on the compression side with a common rail via a high-pressure line, from which common rail a plurality of injection lines lead away to the individual injection valves, and having one pressure valve each in the supply line and the high-pressure line, by way of which a return flow of fuel out of the pump work chamber into the supply line and out of the high-pressure line into the pump work chamber is prevented. The pressure valve of the supply line and the pressure valve of the high-pressure line are disposed in a common valve combination.

Abstract: A flow valve for a fuel supply system is arranged in a supply line leading to an internal combustion engine and, in a basic position upon the start of the internal combustion engine, closes a branch line which leads to a sucking-jet pump. For this purpose the flow valve has a closure member which is displaceable substantially transverse to the direction of flow by the flow of the fuel.

Abstract: A cover for a fuel tank opening is molded with insulating resin and a plurality of terminal pins is directly inserted thereinto. A lower housing portion, made of conductive resin and containing a fuel filter element, is weld-connected to the fuel tank side of the cover. A fuel pump is held under the cover. When electricity is supplied to the fuel pump via an electric connector, fuel is discharged from the fuel pump and this discharged fuel is filtered by a fuel filter. Static electricity generated in the fuel filter dissipates through the lower housing portion made of conductive resin. This construction enables suppression of electrostatic voltage generated in the fuel filter. Moreover, a plurality of connector terminals are directly inserted into the upper housing cover portion of the fuel filter housing at the time of molding, which can therefore supply electric power to the fuel pump with a simplified construction.

Abstract: In a fuel removal device including a fuel pickup pot for disposition in a vehicle fuel tank, the fuel pickup pot has integrally formed therewith two receptacles extending from the bottom of the pickup pot, one for receiving a filter with a fuel suction line and the other for receiving a fuel return line.

Abstract: A fuel supply system is installed inside a fuel tank as part of a cover closing an opening of the fuel tank. The fuel filter is integrally fixed to the cover and a fuel pump is mounted via the fuel filter. The fuel filter is in the shape of a partial annulus disposed in a certain angular range. Such system parts as a pressure regulator, an electric connector, a fuel level gauge and a fuel pipe are contained in the remaining angular range of the fuel pump periphery where the fuel filter is not disposed.

Abstract: A fuel supply system of an internal combustion engine includes, a fuel return branch connection positioned downstream of a fuel filter. The branch connection returns part of the fuel which passed the fuel filter back into the fuel tank. An end of the fuel return connection is extended to the bottom of the fuel tank. A throttle part for controlling returned fuel flow is positioned in the branch connection. Because part of fuel which passed the fuel filter is returned into the fuel tank, fuel in the fuel tank is repeatedly filtered by the fuel filter. Thus, removal of dust in the fuel is improved and total fuel flow passing through the fuel pump is increased. This improves cooling of the fuel pump and thus helps prevent vapor generation while also improving durability of the pump.

Abstract: A fuel delivery system (200) is provided for removing air from fuel delivered to a diesel engine, and includes a primary water separation filter (16), and a secondary air separation filter (18). The air separation filter (18) is located downstream from the water separation filter (16) for delivering substantially gas-free fuel to the engine at a positive pressure in a volumetric rate exceeding engine fuel demand. The air separation filter includes a vessel (58), a fuel inlet into the vessel (300), a fuel outlet (424) leading to the engine, an inlet side fuel return discharge (294), an outlet side fuel return discharge (428) leading to the fuel tank, and a filter cartridge (58) including filter element (94) presenting numerous small openings therein for permitting the passage of fuel therethrough but screening out bubbles entrapped in the fuel. As the bubbles are trapped on the element, they float upwardly for discharge through gas discharge port (294).

Abstract: A fuel control system is provided. Fuel is delivered into a main canister from a low-pressure pump, where it gathers in a reservoir or bottom area. The fuel in the reservoir is taken up by a small high-pressure pump inside the housing, which drives the fuel to the fuel injectors of an engine. The low-pressure pump has a flow rate exceeding that of the high-pressure pump. A vapor trap captures accumulating fuel vapor. Volumetric excess fuel and vapor are vented back to the fuel tank and atmospheric pressure. Vapor lock is reduced or avoided, and particulate and water filters are provided to avoid contamination.

Abstract: A fuel/vapor separator apparatus for de-vaporizing fuel entrained with vapor has a hollow canister defining a separation chamber. The canister has an input port for receiving the fuel entrained with vapor, an output port in communication with the engine for removal of the de-vapored fuel from the chamber, and a vapor port for removal of the released vapor from the chamber. A screen element is located in the separation chamber of the canister between the input port and the output port for agitating the fuel to release the vapor from the fuel. The apparatus has a valving arrangement for connecting the vapor port to the reservoir. The valving arrangement has at least three ports. The vapor port of the canister is in communication with the first port of the valving arrangement. The reservoir is in communication with the second port of the valving arrangement, and ambient air is in communication with the third port.

Abstract: A fuel delivery system for delivering fuel from a fuel tank to an internal combustion engine includes a fuel pump disposed within the tank and an accumulator communicating between the fuel pump and the engine for storing a volume of fuel under pressure. The system also includes a fuel pump control means for controlling the output of fuel flow from the fuel pump. The control means selectively causes the fuel pump output flow to either supply fuel to both the engine and the accumulator or bypass fuel at a lower pressure while fuel is supplied by the accumulator alone, thereby reducing the average power demand of the pump.

Abstract: An arrangement for pumping fuel out of a supply tank to an internal combustion engine having an electrically driven pumping unit which is disposed in a ram pot inserted into the supply tank. The ram pot is filled with fuel from the tank by means of a jet pump provided on its bottom; the intake opening of the jet pump is preceded by a filter that is formed by at least one ring of teeth axially protruding from the bottom of the ram pot, which enclose an intake chamber into which the intake opening of the jet pump protrudes.

Abstract: A device for supplying an internal combustion engine of a motor vehicle with a fuel from a supply container has a fuel feeding aggregate arrangable in the supply container for supplying the fuel through a feeding line, a fuel filter through which the fuel passes, a holder mountable on the supply container, with the fuel filter arranged on the holder and having a clean-side outlet and feeding line integrated in the holder, and a connecting pipe which is arranged outside of the holder and to which the clean-side outlet of the filter is connected through the integrated feeding line.

Abstract: The invention concerns an internal-combustion engine with fuel injection, in particular a single-cylinder diesel engine, in which the fuel-injection pump (3) is connected to the fuel pressure line (23) by a constant-pressure valve assembly comprising a feed valve (28) and a pressure-relief valve (29) mounted with its direction of flow opposite to the feed direction. Both valves (28, 29) are fitted next to each other and off the cylinder axis in a separate valve housing located directly on top of the pump cylinder (5).

Abstract: A low-pressure fuel filter is disposed in a fuel-return pipe from the fuel pressure regulator. In a portion of the fuel-return pipe between the fuel pressure regulator and a fuel element of the low-pressure fuel filter, a bypass device which includes, for example, a jet pump or an aperture may be provided so that fuel can flow back to the fuel tank, bypassing the fuel filter when the fuel filter is blocked.

Abstract: A combination check and vent valve assembly for an automotive engine fuel system. The valve assembly has a fuel passage through a housing with an inlet communicating with a fuel pump outlet and an outlet to supply fuel to the engine. A check valve is disposed within the fuel passage which is normally closed when the fuel pump is not operating, and will open when the inlet fuel pressure exceeds the outlet fuel pressure. A normally closed vent valve is disposed within the fuel passage upstream of the check valve and serves as a moveable seat for the check valve, which will open when the valve assembly outlet fuel pressure is greater by a predetermined value than the fuel pump outlet pressure to bleed fuel through the passage and to the pump to reduce the outlet fuel pressure to a predetermined minimum pressure.

Abstract: A simple and compact fuel supply system which prevents generation of fuel vapor in a delivery pipe of an engine includes a check valve is disposed at a down stream portion of a fuel pressure relieving member or a fuel pressure regulator to seal the fuel delivery pipe when the engine stops so that the pressure in the delivery pipe increases as fuel vapor is generated and, consequently, generation of the fuel vapor is automatically suppressed. Transmission of a pressure wave from the delivery pipe caused while injectors are operating is prevented by the check valve so that harsh noise, which is otherwise caused by resonant vibration of fuel supply pipes and related members, is suppressed.

Abstract: A method and apparatus are disclosed for measuring atmospheric pressure in conjunction with an air-fuel ratio sensor of the type comprising a concentration cell with atmospheric air and exhaust electrodes on opposite sides of a solid-state electrolyte having oxygen ion conductivity. During an atmospheric pressure measuring cycle, oxygen ions are pumped from the atmospheric air electrode to the exhaust electrode, in a quantity which is either predetermined at a fixed value, or is sufficient to bring the cell to an equilibrium state. Atmospheric pressure is then calculated from measured emf of the cell, using an experimentally derived functional relationship. In a second embodiment, ions are pumped until a predetermined change of the concentration cell emf is achieved, and atmospheric pressure is determined based on the amount of time required to achieve such change. The atmospheric pressure measuring mode is operated on a time shared basis with the air-fuel ration detection mode.

Abstract: A device presenting a high-pressure pump, and a low-pressure pump connected pstream from the first. To prevent damage in the event of a fault on the device, the connection between the low- and high-pressure pumps is provided with a cutoff valve which is closed in the event of a fault on the low-pressure pump to prevent the intake of solid particles by the high-pressure pump. Also, in the event of a fault on one of the injectors, detected on the basis of the operating conditions of the engine, the low-pressure pump is disconnected to prevent seriously damaging the engine.

Abstract: A motor vehicle fuel system is provided. The fuel system includes a fuel tank which has an upper wall portion and defines a first interior volume for storing fuel therein. The first interior volume includes a first ullage space adjacent the upper wall portion. The fuel system of the present invention also includes a generally cup-shaped vapor reservoir carried within the first interior volume. The reservoir has vertically extending sides, a horizontally extending top and an open bottom operative to define a second interior volume open to the bottom of the fuel tank. The second interior volume includes a second ullage space in fluid communication with the first ullage space. Fluid communication between the first and second ullage spaces is effected by providing a small bleed orifice and a large orifice arranged in parallel fluid relationship with the small bleed orifice in the top of the reservoir.

Abstract: An arrangement limits a fuel supply from a fuel pressure reservoir by way of a controllable injection valve into the combustion space of an internal-combustion engine. The fuel flow is interrupted as a function of the forces applied to a spring-prestressed valve separating piston in the event of an outlet-side pressure drop. A reliable limiting of the maximal injected fuel quantity is achieved by providing a flow-through opening penetrating the separating piston with a closing device. This flow-through opening can be closed as a function of the displacing direction of the separating piston. If the displacing device closes the flow-through opening in the starting position, during the injection phase and in the piston end position, the limiting valve will continuously interrupt the fuel flow in the case of an outlet-side pressure drop.

Abstract: A value for a quantity of fuel remaining in a fuel tank is stored when a key switch is switched off. Refueling while an engine is stopped is detected when a difference between a remaining fuel quantity value for when the key switch is switched on and the stored remaining fuel quantity value for when switched off is equal to or greater than a predetermined proportion of the stored remaining fuel quantity value for when switched off. When refueling has been carried out, the fuel property is newly detected based on engine operating conditions, while when refueling has not been carried out, the fuel property is considered to be unchanged, and a fuel supply quantity is controlled in accordance with a fuel property for the previous time.

Abstract: This disclosure relates to a discrete fuel filter having a tubular filter cartridge in its own socket in a filter housing. The socket is mounted in fluid communication with the inlet of a fuel rail for an internal combustion engine. In another embodiment, a fuel pressure regulator is operatively connected to be in fluid communication with the output of the filter and the input of the fuel rail. In each application the unfiltered fuel flows through the filter media from the input of the filter housing to the outlet of the filter housing.

Abstract: A flow control valve for an internal combustion engine fuel delivery system that includes a valve body having a fuel inlet for connection to a fuel supply and a fuel outlet for connection to the fuel pump, so that the pump can draw fuel under vacuum from the supply through the valve and deliver fuel to an engine. A valve element is disposed within the valve body between the inlet and the outlet, and springs urge the valve element to a closed position within the valve body. A diaphragm is also disposed within the valve body between the valve element and the fuel outlet, and is coupled to the valve element such that suction vacuum applied by a fuel pump to the valve body outlet operates the diaphragm to open the valve element against forces applied by the valve springs to permit flow of fuel from the supply through the valve to the pump.

Abstract: The fuel-filter housing for an automotive vehicle is built into an air filter or the fuel tank or the fuel-tank venting filter so that its cover is available on an outer wall of the component into which it is built for removal and replacement of the filter cartridge. Any leakage is collected in the component in which the filter housing is mounted.

Abstract: An integral pressure damper is designed for use with an internal combustion engine having a fuel return line and a fuel rail in a fuel system that requires a damper. The integral pressure damper comprises a fitting securable to the fuel return line, and a damper assembly securable to the fitting. The fitting is securable to the return line. The present invention allows the flexibility of attaching the return line to the fuel rail using braze or any other suitable attachment process, before the damper is attached to the return line. The damper is subsequently secured to the fitting, such as by crimping a housing of the damper to the outside of the fitting, or by crimping the fitting to the outside of the housing.

Abstract: A fuel delivery system for a fuel injected automotive internal combustion engine has a fuel pump mounted within a fuel tank for pumping fuel through a fuel line to an engine mounted fuel rail which delivers fuel to a plurality of fuel injectors. Attached on the output side of the fuel pump in the fuel line is a pressure valve for controlling fuel flow from the pump to the rail and from the rail to the pump. The pressure valve has a housing for containing a check valve, which opens upon the fuel pump delivering a predetermined pressure to the fuel line, and a pressure relief valve, which opens to allow fuel flow from the fuel line to the output side of the fuel pump when the fuel line is overpressurized. The relief valve has a predetermined set point greater than that of the check valve is mounted in parallel therewith so that pressure in the fuel line is maintained at an appropriate level during long deceleration periods, as well as when the engine is off.

Abstract: An arrangement for supplying an internal combustion engine with fuel has a supply container with an opening, a feed pump insertable into the supply container through the opening, a closure part closing the opening and provided with a pressure regulator having a pressure chamber with a connection to a pressure side of the feed pump to an internal combustion engine and to an unloading chamber. The pressure regulator has a spring-loaded closing member controlling the connection with the unloading chamber and cooperating with a seat so that after exceeding of a predetermined pressure in the pressure chamber the connection of the pressure chamber to the unloading chamber is released. The closure part is composed of a synthetic plastic material and having a flange-like base body which closes the opening. The base body is provided with a depression and a pipe which is formed of one piece with the base body and extends into the depression to form the connection of the pressure chamber with the unloading chamber.

Abstract: A fuel injection control mechanism for use in a fuel system is adapted to be connected between a fuel injection pump and a fuel injector. The mechanism includes a main passage, a chamber, a primary valve connecting the main passage to the chamber, a piston disposed within the chamber, a spring biasing the piston toward the primary valve and an adjustment compartment. A wall separates the chamber from the adjustment compartment, and a removable cap encloses the adjustment compartment. Apparatus is provided for adjusting the biasing force of the spring and travel limits of the piston. Adjustment can be accomplished to vary fluid characteristics in the fuel delivered to the injector without the need to disassemble the mechanism or disconnect the mechanism from the fuel system.

Abstract: A metering system is provided which controls the amount of fuel supplied to the combustion chambers of a multi-cylinder internal combustion engine comprising a fuel pump for supplying fuel at low pressure to a first and a second group of unit fuel injectors, a first solenoid-operated fuel control valve controlling the flow of fuel to the first set of injectors and a second solenoid-operated fuel control valve controlling the flow of fuel to the second set of injectors. The system may also include first and second solenoid-operated timing fluid control valves associated with the first and the second group of injectors, respectively. The injectors are capable of being in the fuel receiving mode, establishing a metering period, and the timing receiving mode, establishing a timing period, at the same time to increase the amount of time available for metering both timing fluid and fuel.

Abstract: In a fuel delivery system that includes a pump for supplying fuel under pressure from a supply to an internal combustion engine and a pressure regulator for returning excess fuel from the engine to the supply, a check valve is positioned between the pump and the engine for preventing back-flow of fuel from the engine to the pump. The valve has a flow passage with a central axis and a valve seat orientated away from the pump. A valve element is positioned within the passage for axial motion against a coil spring as a function of fuel flow from the pump. A first portion of passage surrounding the valve element has a cross section to fluid flow that increases substantially monotonically from the seat for an axial distance that at least corresponds to maximum travel of the valve element against the spring.

Abstract: Normally, the fuel pressure in a forward-flow fuel pipe leading to an internal-combustion engine is controlled in such a manner that a pressure regulator branches off a partial flow into a return-flow pipe which leads without pressure into a fuel tank. Normally, the branch-off pipe as well as the pressure regulator are arranged close to the internal-combustion engine in a closed-off engine compartment, for example, of a motor vehicle. However, as a result, not only the fuel flow returned by way of the return-flow pipe will heat up but, as a result of the waste heat of the internal-combustion engine, also the fuel volume situated in the fuel tank. As a remedy, it is suggested to arrange the branch-off pipe as well as the pressure regulator outside the engine compartment close to the fuel tank. A reversing valve as well as a rinsing pipe are also suggested in order to rinse, after the start of the internal-combustion engine, the injection strip with the complete fuel flow delivered by the pump.

Abstract: This invention describes a fuel system for an internal combustion engine of the diesel type which is completely compatible with methanol and other low cetane liquid fuels. The fuel system is also capable of handling methanol liquid fuel, and other low cetane highly corrosive liquid fuels, of materials fully compatible with the fuel and adapted for long term durability use. Further, a fuel system is disclosed that is free of particulates of less than one micron in size thereby providing superior long term durability protection against scoring within the fuel pump and fuel delivery injectors. The invention also provides a fuel system comprising primary and secondary fuel filters, a fuel pump, and the fuel injectors designed to provide acceptable durability and reliability despite the lack of lubricity in methanol and similar fuels.

Abstract: A fuel handling system for an internal combustion engine having a reservoir for receiving fuel under low pressure from a remote gas tank and a fuel pump for delivering the fuel under high pressure to a fuel injector of the engine while providing vapor separation. The reservoir has an inlet for receiving fuel from the tank, an outlet for removing fuel from the reservoir and delivering it to the engine, a fuel return for returning fuel not used by the engine, a drain for removing water, and a vapor vent for removing fuel vapors from a gas dome above the liquid within the reservoir. The inlet has a valve controlled by a float in the reservoir for admitting fuel to maintain the level of liquid in the reservoir so that the pump is supplied with fuel. To remove fuel, a fuel pickup is coupled to an inlet of the pump which has its outlet coupled to the reservoir outlet. The pickup has a diaphragm for filtering fuel entering the pump while preferably preventing the admission of gas or water.

Abstract: A fluid flow check valve assembly having a tubular valve housing with opposite inlet and outlet end portions and a movable valve member therebetween. The valve member has an end sealing portion engageable with an inlet seating portion of the housing and a flexible annular lip seal portion engageable with the inner wall of the housing. When the assembly is in a first pre-assembly condition which exists prior to insertion of the end of a mating outlet tube into the housing, the valve member assumes a mid-portion in the housing spaced away from the inlet seating portion. In this pre-assembled condition, the valve member's lip seal portion is seated against the inner wall of the housing thereby blocking fluid flow through the check valve assembly. The insertion of an outlet tube into the housing moves the valve member from the preassembly mid-position toward the inlet end of the housing and into a second one-way controlled flow condition.