Abstract: A pressure regulating valve has a valve chamber having an inlet for connecting to a pressure source, a discharge chamber communicating through a valve opening with the valve chamber, a valve member, a valve seat surrounding the valve opening, a valve closing spring which presses the valve member against the valve seat with an adjustable spring force, and a throttling surface arranged downstream of the valve opening so that between the valve member and an inner wall of the discharge chamber, a pressure is formed at the valve member which counteracts the spring force.

Abstract: A high pressure direct injection fuel system includes a low pressure fuel supply; a venturi pump including a variable orifice, first and second inlets and an outlet, the low pressure fuel supply connected to the first inlet of the venturi pump; a high pressure pump connected to the outlet of the venturi pump; a fuel rail connected to an outlet of the high pressure pump, the fuel rail including at least one fuel injector and a pressure sensor; a high pressure regulator connected to the fuel rail; a return flow line connected between the fuel rail and the second inlet of the venturi pump; and an electronic control unit connected to the pressure sensor and the high pressure regulator. The variable orifice venturi pump suppresses gas formation in the return fuel flow thereby allowing the use of a lower fuel supply pressure.

Abstract: A fuel vapour extraction system is described for an internal combustion engine (10) that is supplied with a volatile liquid fuel from a fuel storage tank (20). The engine (10) has an air intake system (12, 14, 16) and a liquid fuel injection system for dispensing fuel to mix with air to be burnt in the engine. The fuel vapour extraction system includes a volatizing chamber (30) connected to the fuel storage tank (20) by a valve (26) serving to maintain a constant liquid level of fuel in the chamber (30). A pipe (42) connected to one or more vacuum sources leads into the vapour space above the liquid level in the chamber (30) and maintains a reduced pressure in the volatizing chamber.

Abstract: A high-pressure pump for supplying fuel in a fuel injection system of an internal combustion engine, including a common rail injector system. The fuel injection system includes a low-pressure part that contains a fuel tank and a prefeed pump and a high-pressure part that contains a high-pressure pump and a common rail into which a fuel flow is fed from the high-pressure pump through a common conduit. The high-pressure pump system solves a problem in that there is an integrated demand-based quantity control for the fuel flow pumped by the high-pressure pump. The demand-based quantity control integrated with the high-pressure pump contributes to improving the overall engine efficiency, because the power consumption by the high-pressure pump drops as a result.

Abstract: A fuel supply unit for a vehicle includes a fuel tank, a fuel pump for providing a fuel supply system of the vehicle with fuel introduced from the fuel tank via a strainer disposed therein, a fuel return pipe for returning surplus fuel from the fuel supply system to the fuel tank and a spongy fuel-adsorbing member disposed between the strainer end a tip of the fuel return pipe.

Abstract: The present invention relates to an injection system for an internal combustion engine operating on self-igniting, liquefied petroleum gas and including at least one injector per cylinder for direct fuel injection into the combustion chamber, a fuel tank in which fuel is held at a feed pressure, and a high-pressure fuel pump delivering fuel to the injector, the pressurized parts of the injector system being connected with the fuel tank by means of pressure relief lines. In order to ensure safe operation in a simple manner the proposal is put forward that a heating device should be provided which will convert the liquefied gas, at least partially, into a gaseous phase, at least in certain sections of the pressurized parts of the injection system. The gas bubble produced during this process will convey the liquid phase of the liquefied petroleum gas into the fuel tank.

Abstract: The invention concerns a relief device for a high-pressure direct-injection pump supplying petrol to an automobile vehicle engine injector manifold, the pump being supplied with fuel by a low-pressure electric fuel pump communicating with a fuel tank and the high pressure delivered being regulated by a pressure regulator, said pressure regulator taking the form of a three-way valve supplying fuel to the manifold via the fuel pump below a predetermined engine rotation speed threshold and then supplying the manifold via the top part of the injection pump when the engine speed is above the predetermined threshold.

Abstract: The level measuring device (12) has a measuring tube (14) that is disposed in the fuel tank (10) and is filled by a partial flow of the fuel delivered to the injection system (44) of the engine (46) of the motor vehicle by a delivery unit (40) disposed in the fuel tank (10). On its one measurement input (26), a differential pressure sensor (24) is acted on by the hydrostatic pressure at the bottom end (30) of the measuring tube (14) and on its other measurement input (28), the sensor is acted on by the hydrostatic pressure at the bottom (16) of the fuel tank (10). When the delivery unit (40) is operating, a fuel column of a known height (lo) is produced in the measuring tube (14), so that the current level (h(t)) of the fuel tank (10) can be determined in an evaluation device (32) based on the output signal (u) of the differential pressure sensor (24).

Abstract: A fuel filter 10, constructing a supply unit 8, comprises a filter case 11 having an electric conductivity and a filter element 14. The filter case 11 is formed with an inside wall portion 11A and an outside wall portion 11B into a U shape in lateral cross section, so as to enlarge a contact area contacting with fuel in a fuel tank. The fuel discharged from the fuel pump 9 flows into a fluid chamber 15 of the fuel filter 10, and then be supplied from a fuel supply conduit 20 through a fuel flow passageway 12A to the outside. At this time, static electricity charged in the filter case 11 is discharged through its outer peripheral surface into the surrounding fuel having a slight electric conductivity.

Abstract: The invention relates to a device for a fuel system, having a pressure chamber that communicates with a fuel connection and having a diaphragm that is installed at its outer peripheral region in a housing and partitions off the pressure chamber. A preassembled unit can be fastened, with the diaphragm built into the housing, on the basic body and the diaphragm can come to rest on a stop provided on the basic body. The device is intended in particular for regulating a pressure in a fuel system.

Abstract: A filter head having a pump housing, a flow passage network, and a mounting bracket is adaptable to engage a replaceable filter cartridge. An electric pump is positioned within the pump housing. A Seal/isolator disposed between the pump housing and electric pump protects the electric pump from vibrations. After changing the filter cartridge, typically an air pocket forms creating a danger for a fuel injector or fuel injector pump. By using an electronic controller, an operator may remotely operate the electric pump to prime the filter cartridge. Also, the electronic controller may selectively determine whether the fluid flowing from the filter cartridge passes through the electric pump or instead passes directly into an outlet.

Abstract: A fuel pump module constructed to be disposed exteriorly of a vehicle fuel tank carries, as a single unit, an electric motor fuel pump and a pressure control device which controls the pressure of fuel delivered to an internal combustion engine from the fuel pump. Fuel supplied from the fuel tank to the module is drawn into the fuel pump which increases the pressure of the fuel and then discharges the fuel under pressure from an outlet of the fuel pump which communicates with the pressure control device carried by the module and an outlet of the module which in turn, communicates with the engine. The pressure control device may be either a pressure relief valve, which functions to limit the maximum pressure of the fuel delivered to the engine, or a fuel pressure regulator, such as a bypass pressure regulator, which bypasses to a point upstream of the fuel pump inlet fuel delivered from the fuel pump in excess of the engine's fuel demand.

Abstract: A device for delivering fuel from a fuel tank includes reserve cup, which can be inserted into the fuel tank and fixed there in place in an end position, in which the device is assembled in the fuel tank, and a fuel delivery pump positioned in the reserve cup. For automatic drainage of the reserve cup during disassembly of the fuel delivery device from the fuel tank the reserve cup has a drain opening which is blocked by a blocking element in the end position of the reserve cup in the fuel tank, and is released for fuel drainage when the cup is lifted from its end position on the bottom of the fuel tank.

Abstract: A fuel filter (10) has a filter case (11), and a return path (25) is provided on the upper surface of the filter case (11). Return fuel discharged from a pressure regulator is supplied to the return path (25). The return path (25) having a closed lower end is provided with branch paths (26). The return fuel supplied to the return path (25) passes through the branch paths (26) and flows down into fuel reservoir along the outside peripheral surface of the filter case (11). Electrical charge on the surface of the filter case (11) is reduced when the return fuel flows along the outside peripheral surface of the filter case (11). Kinetic energy of the return fuel is reduced by the energy absorbing effect of the return path (25), the energy distributing effect of the branch paths (26), and the energy absorbing effect when the return fuel flows down along the outside peripheral surface of the filter case. Thus, fuel return sound waves from the returning fuel dropping into the fuel reservoir are reduced.

Abstract: A surge pot intended for mounting in a fuel tank has a walling with a circumferential elastic insert. In this way, the surge pot has in a mounting position a small cross section with which it can be passed through a mounting opening in the fuel tank. After the mounting, the elastic insert is pressed outward so that the surge pot can receive a particularly large amount of fuel.

Abstract: The invention relates to a overflow valve for a device (1) for pumping fuel, in which the device (1) has a supply container for fuel for an internal combustion engine of a motor vehicle, a catchment (6) disposed in the supply container, a fuel pumping assembly (19) that aspirates from the catchment (6) and communicates on the pressure side with the engine, a return line (2) from the engine or a direct branch (33) from the pressure line (20) to the supply container, and a fluid entrainment pump (3) communicating with the return line (2) or the branch and disposed in the supply container, by which pump fuel is pumped into the catchment (6), and the overflow valve (22) closes or opens a overflow opening (4) to the fluid entrainment pump (3). The overflow valve has a spirally shaped spring (12), which holds a closing member (7) and presses it vertically in the direction onto the overflow opening (4).

Abstract: A safety system is provided for a vehicular fuel line installation which includes a fuel tank, an engine and delivery and return lines extending between the tank and the engine. A pump is operatively associated with the delivery line to feed fuel from the tank to the engine. Safety valves are provided in the delivery line at the pump and at the engine as well as in the return line at the tank and at the engine. A fuel filter is disposed in the delivery line and flexible hose sections may be disposed in the delivery line and/or the return line, and safety valves are disposed at opposite ends of the fuel filter and the flexible hose sections.

Abstract: A control valve for an injection valve for injecting fuel into an internal combustion engine is described. The injection valve has a control chamber which is connected via an inlet throttle to a high-pressure accumulator, and which can be connected via the control valve and an outlet throttle to an unpressurized return line to a fuel tank. The pressure prevailing in the control chamber acts on a movable nozzle body which is provided with a nozzle needle which releases and seals injection holes as the nozzle body moves. The control valve is constructed adjoining the control chamber, with the result that the pressure prevailing in the control chamber at a first operating surface also acts on the valve body of the control valve. The control valve has a valve chamber which is disposed opposite the control chamber and is connected to the control chamber via the outlet throttle and has a second operating surface, which is smaller than the first operating surface.

Abstract: The invention relates to a device for a fuel supply system, having a pressure chamber that communicates with a fuel connection, and having a diaphragm built in on its outer peripheral region in a basic body which partitions off the pressure chamber, wherein the diaphragm is fastened in the peripheral region with a spring ring that is under initial tension and is retained on the basic body.

Abstract: A fuel delivery system 10 includes a fuel rail 22 to supply fuel to at least one fuel injector 26, a high pressure fuel pump 20 to provide fuel to the fuel rail 22, a fuel regulator 28 to regulate fuel pressure at the fuel rail 22, and flow restriction structure 30, 32 disposed in a fuel return line 34 between the fuel regulator 28 and the high pressure fuel pump 20. The flow restriction structure 30, 32 is constructed and arranged to substantially prevent bubbles from reaching the high pressure fuel pump 20 when the high pressure fuel pump is providing fuel in a certain flow range to the fuel rail 22. The flow restriction structure defines at least one flow restricting orifice.

Abstract: Apparatus for feeding fuel to an engine is disclosed including a storage tank and a supply tank, the storage tank having a substantially greater volume than the supply tank, a filter, a first conduit for feeding the fuel from the storage tank to the filter to provide filtered fuel, a second conduit for feeding the filtered fuel from the filter to the supply tank, a third conduit for supplying the filtered fuel from the supply tank to the engine, and a fourth conduit for recirculating excess fuel from the supply tank to the storage tank.

Abstract: In a high pressure fuel pumping apparatus 3, a drain passage 12 for fuel having leaked from the inside of a fuel sealing metallic bellows 26, and another drain passage 13 for a high pressure fuel regulator 8 for regulating the pressure discharged from the high pressure fuel pumping apparatus are merged at a merging point. A lead type of check valve 17 is located upstream in the drain passage 12 between the merging point 14 and the fuel sealing metallic bellows 26, and a ball type of check valve 18 is located downstream in the drain passage 12.

Abstract: A temperature distribution of fuel flowing through a delivery pipe is detected by two fuel temperature sensors provided in the delivery pipe and a fuel tank. When this temperature distribution exceeds an allowable range, adjusted pressure pumping processing in which an amount of fuel corresponding to an injection amount is pumped is stopped and quantitative pressure pumping processing is begun. In quantitative pressure pumping, a rate of fuel flowing through the delivery pipe is increased to an amount exceeding an amount of fuel injected from injectors. With this feature, an amount of fuel flowing through the delivery pipe is greatly increased, a temperature rise rate due to thermal energy from the engine is lowered, and the range of temperature distribution of fuel is narrowed down as a whole. Therefore, differences in output torque among the cylinders is reduced, and variations in the revolution of the engine are suppressed or prevented.

Abstract: To guard against electrostatic discharge in a pressure regulator, a flange of a fuel delivery module for connecting a tank with a fuel feed line of an engine, having a pressure regulator for regulating the pressure in the fuel feed line, and having at least one hookup for an external electrical potential, is characterized in that the flange is embodied in at least some portions of weakly electrically conductive material, in such a way that the hookup is connected conductively with the pressure regulator via the weakly electrically conductive material.

Abstract: A two stage pressure relief valve for releasing a fluid under pressure includes a body having a bore extending from an inlet and terminating in an outlet. A first chamber which communicates with the inlet and a second chamber which communicates with the first chamber and the outlet are provided and are dimensioned such that the cross sectional area of the second chamber is greater than that of the first chamber. An operator seat is disposed within the body and an operator is moveably disposed within the bore and engages the operator seat. The operator includes a blocking surface which blocks at least a portion of the flow of fluid. When the pressure of the fluid exceeds a threshold pressure, the operator is unseated whereby fluid flows at a first flow volume such that at least a portion of the fluid impinges the blocking surface causing the blocking surface to move within the second chamber whereby fluid flows at a second flow volume. The second flow volume being greater than the first flow volume.

Abstract: An apparatus for drawing off fuel for a motor vehicle tank, the apparatus being of the type comprising a secondary reserve (20) suitable for being placed in a main tank (10), main pump (30) suitable for drawing fuel from the reserve (20), and auxiliary pump (40) of the jet pump type suitable for drawing fuel from the main tank and for transferring it to the secondary reserve (20). The body (41) of the jet pump (40) is angularly positioned to be vertical, with its outlet facing upwards.

Abstract: A hydro-mechanical device and methods therefor, for receiving fuel from a variable displacement fuel pump of a fuel-supply system and delivering the fuel to a common rail of the fuel-supply system, regulates the fuel-pressure in the fuel-supply system, at least in part, based on the output of the fuel pump such that optimal engine performance can be maintained under varying operating conditions.

Abstract: A unit for supplying fuel to an endothermal engine, the unit comprising a manifold to which injectors are connected in order to supply fuel to the engine, a high pressure pumping device which has its output connected to the manifold and its intake connected to an extraction pump adapted to transfer fuel from the storage tank to this device and a pressure regulator adapted to regulate the pressure of the fuel supplied to the pumping device by supplying surplus fuel along a bleed duct communicating with the tank, the pumping device having at least one piston moving axially within a respective cylinder in order to define a variable volume pumping chamber.

Abstract: In a fuel delivery device for a motor vehicle a delivery pump (15) is provided in addition to a fuel pump (14). The delivery pump (15) serves to fill a surge baffle (5) and to drive a sucking jet pump (6). The fuel pump (14) draws in fuel from the surge baffle (5) and delivers it to an internal combustion engine (2). For this purpose, the fuel pump (14) is arranged in a feed line (3) in the vicinity of the internal combustion engine (2). A return line (4) leads from the internal combustion engine into the surge baffle (5).

Abstract: A chamber structure is provided which is able to flow down fuel smoothly at a desired flow rate. A chamber main body is fixed onto an inner bottom 1a of a fuel tank of a vehicle, and a suction port of a fuel pump is inserted into an inside of the chamber main body. A through hole is formed in a peripheral wall of the chamber main body. A fuel tank side through hole for connecting an inside of the fuel tank and a negative pressure chamber being connected to the first through hole is arranged in a vicinity of the inner bottom of the fuel tank. An inlet port for passing return fuel into the inside of the fuel tank is faced to the negative pressure chamber. A recirculation funnel which has an upper end opening directed to the inside of the chamber main body at a position lower than an upper edge of the chamber main body is formed to extend upward from the negative pressure chamber.

Abstract: A marine fuel tank pump comprises a container for assembly into a marine fuel tank. An electric fuel pump is housed in the container. The pump has an inlet receiving fuel from the tank and an outlet. A pressure release is operatively associated with the outlet for releasing pressure from the outlet into the fuel tank when the pump is deenergized.

Abstract: The fuel supplying apparatus of the invention includes a fuel injector 1 injecting a fuel; a fuel tank 2; fuel paths 4 and 5 connecting the fuel injector 1 and the fuel tank 2; a low-pressure fuel pump 10 provided in the upstream; a high-pressure fuel pump 3 which is provided between the low-pressure fuel pump 10 and the fuel injector 1, a cylinder having a hole 41a, and a plunger 43 arranged reciprocally movably in the hole 41a, sucks and pressurizes the fuel through a suction port 5c into the fuel pressurizing chamber 45, discharges the pressurized fuel from a discharge port 4d, and pressure-transfers the fuel to the fuel injector 1; and a high-pressure regulator, which is provided between the high-pressure fuel pump 3 of the fuel path 4 and adjusts pressure of the fuel discharged from the high-pressure fuel pump 3.

Abstract: A system for delivering fuel to a motor vehicle engine includes a fuel sending unit and a self-cleaning filter. The fuel sending unit is in fluid communication with the engine, which in the preferred embodiment is a fuel injected engine. A fuel regulator is provided interbetween the fuel sending unit and the engine which delivers a first portion of the fuel to the engine. A second portion of the fuel is delivered to the filter for the sending unit through a reverse path for purging the filter of debris collected from the fuel.

Abstract: A fuel supply system has a fuel tank in which a sub-tank and a jet pump are installed. The jet pump has a fuel supply passage into which fuel returned from an engine of a vehicle is supplied, and a fuel injection passage having an injection hole at a fuel downstream end thereof. The fuel supply passage and the fuel injection passage are perpendicular to each other and are communicated with each other so that passage axes thereof do not cross each other. Therefore, fuel introduced into the fuel injection passage from the fuel supply passage swirls in the fuel injection passage. As a result, fuel injected into a fuel inlet passage of the sub-tank from the injection hole uniformly disperses over an entire cross-section of the fuel inlet passage, forming a fuel membrane. Therefore, fuel is continuously introduced into the sub-tank in opposition to a water head pressure of fuel in the sub-tank.

Abstract: A fuel filter and pressure regulator assembly includes a housing, an inlet tube, an outlet and return tube each made of stainless steel. An annular filter element is disposed within the housing and abuts at one end a pressure regulator element which is mounted within an O-ring retainer that is fixed within the housing. A resilient device, such as a wave washer or O-ring, is compressed as the assembly is assembled. In operation, fuel flows in through the inlet tube which is radially offset at a first end of the housing and into an annular space around the annular filter element. The fuel then flows through the filter media and the filter element and out of the outlet tube which is aligned with a hollow core of the filter media. If fuel pressure is too high, the fuel then flows through the pressure regulator, out of the return tube and back to the fuel tank.

Abstract: A fuel supply system for providing fuel from a fuel source to a combustion chamber of an engine is disclosed. The fuel supply system includes a vapor separator in which vapor is separated from fuel supplied from the fuel source. A pre-pressurizing pump pressurizes fuel from the vapor separator to a first pressure and delivers it to a high pressure pump. The high pressure pump pressurizes the fuel to a pressure above the first pressure and delivers it to a fuel rail to which is connected a fuel injector for delivering fuel into the combustion chamber. A fuel return line extends from the fuel rail for returning undelivered fuel back to the fuel system. A valve controls the flow of fuel through the return line and maintains the fuel at high pressure in the fuel rail. A fuel cooler is provided along the return fuel line.

Abstract: A fuel supply system for an internal combustion engine is provided with a fuel tank for liquid fuel, from which a fuel supply line leads to a fuel injection device, and an evaporating and condensing device for low-boiling fuel components, connected to the fuel tank. Also provided is an intermediary tank connected downstream from the evaporating and condensing device, for condensate, from which tank a condensate line leads to a control valve that regulates supply to the injection device. A residual fuel line for the high-boiling fuel produced in the evaporating and condensing device ends in an additional tank, from which a residual fuel supply line runs to a reversing valve mounted in the fuel supply line. The reversing valve is controlled so that the high-boiling fuel is supplied from the residual fuel supply line into the fuel supply line going to an injection device of the engine.

Abstract: According to the present invention, there is provided a fuel reserving device for reserving fuel therein. The device comprises a fuel tank for reserving fuel therein, and a fuel vapor tank for reserving fuel vapor therein. The fuel vapor is fed from said fuel tank to said fuel vapor tank and returned from said fuel vapor tank to said fuel tank. The fuel vapor is not returned from said fuel vapor tank to said fuel tank when a pressure in said fuel tank would be higher than a predetermined pressure if the fuel vapor was returned from said fuel vapor tank to said fuel tank.

Abstract: The invention provides a device for eliminating cavitation in the excess fuel return orifice(s) in the compression chamber of a fuel injection pump of an internal combustion engine after the end of the injection stage, said injection pump being connected firstly to a feed duct including a first check valve having low headloss enabling fuel to reach the compression chamber, and secondly to an excess fuel return duct,wherein the return duct comprises in parallel and close to the return orifice of the injection pump, a second check valve that is rated to cause the pressure in said return orifice of the injection pump to rise, and a two-port valve that is normally open and that is caused to close by the appearance of pressure in the return orifice greater than the pressure which obtains in the feed duct upstream from said first check valve.

Abstract: A fuel chamber provided in a fuel tank for an automotive vehicle in order to effectively prevent a temperature of a fuel within a fuel tank from ascending not so as to generate a vapor due to a fuel returned to the fuel chamber end from an engine is mainly disclosed. In a typical fuel chamber, a fuel chamber main body, a jet nozzle member having a front end portion inserted into a hole portion communicating an inner portion with an outer portion of the fuel chamber main body, a cover body forming a pressure reduction chamber decompressed in response to that the jet nozzle member injects a return fuel to the fuel chamber main body through the hole portion, and a tubular circulating member circulating a fuel within the fuel chamber main body are provided. The fuel stored within the fuel tank is introduced into the fuel chamber main body and the fuel within the fuel chamber main body is circulated in response to that the jet nozzle member injects the return fuel into the fuel chamber main body.

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: In a high pressure fuel injection system, fuel is pumped up from a fuel tank by a low pressure pump and further pressurized by a high pressure pump. Pressurized fuel is accumulated in a common rail connected to injectors which inject fuel into an engine. A high pressure regulator is connected to the common rail to mechanically relieve excessive fuel pressure in the common rail or to electronically reduce the fuel pressure when required. An electronic control unit controls operation of the high pressure pump, the high pressure regulator and the injectors according to engine operating conditions which are fed to the unit from various sensors. The fuel pressure in the common rail is decreased by operation of the high pressure pump and the high pressure regulator either rapidly or gradually according to engine operating conditions.

Abstract: The invention relates to a high-pressure pump for fuel delivery in fuel injection systems of internal combustion engines, which includes a tank, a pre-feed pump, and the high-pressure pump. The pre-feed pump aspirates a total fuel flow from the tank and this total fuel flow is divided into a lubricating flow, which is conveyed through the high-pressure pump for the purpose of lubrication, and a delivery flow, which is acted on with high pressure by the high-pressure pump and is delivered to a common distributor rail. The fuel injection system prevents damage that could occur during operation. Damage is prevented because the total fuel flow is conveyed through the high-pressure pump for the purpose of lubrication, wherein a metering unit for the total fuel flow is provided in the high-pressure pump or in a return and assures that only a predetermined delivery flow is acted on with high pressure in the high-pressure pump.

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: The base assembly of a fuel filter assembly includes a base member and a bimetallic disc. The base member has a fuel supply inlet for receiving a flow of new fuel from a fuel tank and an inlet plenum in fluid communication with the fuel supply inlet and the filter cartridge. The base member also has an excess fuel inlet for receiving a flow of excess fuel from the fuel injection pump, an excess fuel outlet in fluid communication with the fuel tank, and a fuel passage providing fluid communication between the excess fuel inlet and the excess fuel outlet. The bimetallic disc is disposed in the fuel passage adjacent an opening in the wall separating the fuel passage from the inlet plenum. The edge portion of the bimetallic disc is flexed away from the wall to open the opening when the temperature of the excess fuel is below a predetermined value, warming the new fuel to prevent formation of wax crystals.

Abstract: An engine is mounted in an engine compartment of a vehicle, and a cooling fan driven directly by the engine is disposed on the front of the engine. A fuel piping structure is located between an exhaust manifold and the cooling fan so that air from the fan passes over and cools the fuel piping structure, and carries the heat of the exhaust manifold rearwardly away from the fuel piping structure.

Abstract: A fuel supply device for an engine has a pump module comprising a fuel pump and a fuel filter. The pump module is housed within a sub-tank mounted in a fuel tank. The fuel filter is shaped arcuately in section and fitted around the outer circular periphery of the fuel pump. The sub-tank has a concave space on its outer periphery. The concave space and its above space accommodate therein a part of electrical connector, a fuel level gauge, electrical lead wires for the electrical connector and the fuel level gauge, a jet pump and a connecting pipe for the jet pump and a fuel return port. This arrangement reduces the diameter of the fuel supply device and facilitates mounting work of the fuel supply device in a limited space in the fuel tank.

Abstract: A fuel system is described which comprises a high pressure fuel pump arranged to supply fuel under pressure to a plurality of injectors. A backleak connection line is arranged to return fuel from the injectors to a fuel reservoir. A venturi pump is connected to the backleak connection line and is arranged to draw fuel from the line to reduce the fuel pressure therein.

Abstract: A dual tank fuel system has primary and secondary fuel tanks, with the primary tank including a filler pipe to receive fuel and a discharge line to deliver fuel to an engine, and with a balance pipe interconnecting the primary tank and the secondary tank. The balance pipe opens close to the bottom of each tank to direct fuel from the primary tank to the secondary tank as the primary tank is filled, and to direct fuel from the secondary tank to the primary tank as fuel is discharged from the primary tank through the discharge line. A vent line has branches connected to each tank to direct fuel vapor from the tanks as the tanks are filled, and to admit air to the tanks as fuel is delivered to the engine.