Abstract: The invention relates to a fuel injection system for an internal combustion engine having a high pressure pump, a high pressure reservoir, a plurality of fuel injectors, a hydraulic pressure booster, and a control valve for actuating the hydraulic pressure booster. The hydraulic pressure booster is provided centrally for all of the fuel injectors. The central hydraulic pressure booster is disposed between the high pressure pump and the high pressure reservoir.

Abstract: A fuel system comprises a fuel line that supplies fuel to an engine at a fuel line pressure. A first fuel pump selectively supplies fuel to the fuel line at a first pressure. A second fuel pump selectively supplies fuel to the fuel line at a second pressure that is greater than the first pressure. A check valve having an inlet in communication with an exit port of the first fuel pump and an outlet in communication with the fuel line is positioned based on the fuel line pressure and the first pressure.

Abstract: An improved high viscosity fuel injection pressure reduction system and method is disclosed for use in an internal combustion engine. The system may include a first fuel line and a second fuel line. The first fuel line may be configured to be coupled upstream of a combustion chamber of the engine when the engine is operated with the first fuel and to provide a first pressurized volume when installed. Likewise, the second fuel line may be configured to be coupled upstream of the combustion chamber of the engine when the engine is operated with the second fuel and to provide a second pressurized volume when installed. The first and second volumes of the fuel lines may provide peak injection pressures lower than a desired pressure when the engine is operated with the first and second fuels, respectively.

Abstract: Proposed is a method for controlling and regulating an internal combustion engine (1), in which the rail pressure (pCR) is controlled via a suction throttle (4) on the low pressure side as a first pressure-adjusting element in a rail pressure control loop. The invention is characterized in that a rail pressure disturbance variable (VDRV) is generated in order to influence the rail pressure (pCR) via a pressure control valve (12) on the high pressure side as a second pressure re-adjusting element, by means of which fuel is redirected in a controlled manner from the rail (6) into a fuel tank (2), the rail pressure disturbance variable (VDRV) being calculated using a corrected target volume flow (Vk(SL)) of the pressure control valve (12).

Abstract: The invention relates to a pressure boosting system for at least one fuel injector of a high pressure injection system of an internal combustion engine, having a hydraulic pressure booster that is actuated by a control valve. The hydraulic pressure booster is configured with a pressure boosting piston, which comprises a first pressure booster piston part having a first diameter and a second pressure booster piston part having a second diameter, wherein the first diameter is greater than the second diameter. The pressure booster piston is disposed within a hydraulic reservoir chamber, onto which pressure is applied, together with the first pressure booster piston part having the greater diameter, wherein the accumulator chamber in turn is configured within a base body. The base body has a piston guide body for at least one of the pressure booster piston parts. The piston guide body is at least partially surrounded by an annular space, which is part of the hydraulic accumulator chamber.

Abstract: A fuel system for a vehicle has a fuel tank, a fuel line in communication with the fuel tank, a carburetor having an inlet side and an outlet side, a return line connected to the outlet side of the carburetor and communicating with the fuel tank, and a nozzle positioned in the return line. The fuel line is connected to the inlet side of said carburetor so as to pass fuel into a fuel bowl of the carburetor. The nozzle has an orifice formed therethrough. The orifice of the nozzle has a diameter of between 0.005 and 0.050 inches. The nozzle is in sealed relationship with an inner wall of the return line.

Abstract: A pressure regulator includes a housing at least partially defining a chamber. A tube defines a valve seat having an inlet disposed inside the chamber, an outlet, and a passageway extending from the inlet to the outlet. The passageway is characterized by a first portion and a second portion that is narrower than the first portion. A valve member is selectively movable between a closed position in which the valve member obstructs the inlet and an open position in which the valve member does not obstruct the inlet. A spring biases the valve member toward the closed position.

Abstract: An arrangement includes, but is not limited to an internal combustion engine, a pressure reducer that reduces gas pressure of gaseous fuel for the engine. The reducer connects on a high-pressure side to a gas tank and connects on the low-pressure side to a controllable gas injection valve regulating the gas flow. A high-pressure shutoff valve is on the high-pressure side and connected to the reducer to shut-off the gas flow from the gas tank. The high-pressure shutoff valve includes, but is not limited to a pilot valve with a small opening and a main valve with a large opening, and an electronic controller used at least for controlling the high-pressure valve and a gas injection valve. The pilot valve of the high-pressure valve opens in chronological order before the gas injection valve.

Abstract: A fuel injection system for an internal combustion engine comprises: a first fuel injector which is arranged within a housing unit; an accumulator volume for supplying fuel to the first fuel injector; a first fuel pump arrangement comprising a pumping plunger which is driven, in use, to cause pressurisation of fuel within a first pump chamber; a first metering valve which is operable to control fuel flow into the first pump chamber; a first fuel passage providing communication between the first pump chamber and the accumulator volume; and a first non-return valve located in the first fuel passage between the first pump chamber and the accumulator volume; wherein the first fuel injector communicates with the first fuel passage at a position between the first non-return valve and the accumulator volume; and wherein communication between the first fuel injector and the accumulator volume is uninterrupted.

Abstract: In known methods for carrying out a high-pressure start of an internal combustion engine, inconvenient starting behavior can sometimes occur. In a method for carrying out a high-pressure start of an internal combustion engine (1), a high-pressure pump (22) is used to feed fuel from a fuel tank (17) to a pressure accumulator (20) and a pressure adjuster (23) is used to control the pressure in the pressure accumulator (20), wherein the high-pressure pump (22) is operated before carrying out a fuel injection into a combustion chamber of the internal combustion engine (1), and the pressure adjuster (23) is activated in such a way that, during the operation of the high-pressure pump (22), the pressure build-up in the pressure accumulator (20) above a pressure limit value pTHRES, upon the exceedance of which the fuel injection is enabled, is delayed.

Abstract: A fuel delivery module includes a fuel filter housing and a cover. The fuel filter housing defines a cavity configured to receive at least a portion of a fuel filter. A first end portion of the fuel filter housing includes a flange configured to be disposed outside of and coupled to a fuel tank. A second end portion of the fuel filter housing is configured to be disposed within the fuel tank and includes an inlet connector configured to fluidically couple the cavity to a fuel pump. The cover is configured to be removably coupled to the first end portion of the fuel filter housing. The cover defines a first lumen and a second lumen. The first lumen is configured to fluidically couple the cavity to a fuel outlet line. The second lumen is configured to fluidically couple the cavity to a regulator.

Abstract: Disclosed is a fuel conveying device including a valve housing in which a pressure release valve and a non-return valve are arranged parallel to one another, the pressure release valve having a first inlet, which downstream of a valve seat opens into a valve chamber in which a valve body is movably arranged and which is in fluid connection with a second inlet for the non-return valve via a first outlet. The device improves the control response of the pressure release valve by providing the first outlet at the periphery of the valve chamber and in the axial direction with respect to a valve axis such that when the pressure release valve is open the flow from the valve chamber into the second inlet is a substantially radial flow.

Abstract: A method for adjusting fuel injection of an engine is disclosed. In one example, fuel injection timing is adjusted to account for fuels having different cetane numbers. Operation of the engine may be improved especially during conditions where combustion phase may vary.

Abstract: An internal combustion engine includes a fuel system having a first fuel rail with an integrated diverter portion coupled to a high-pressure pump and separated from a common rail portion by a flow restriction device. The first fuel rail includes a pressure sensor coupled to the diverter portion at one end and a control valve coupled to the common rail portion at the other end of the same fuel rail. In V-engine embodiments, a second fuel rail communicates with the integrated diverter portion of the first fuel rail. In one embodiment, components including the first and second fuel rails, a pressure sensor, and a pressure or volume control valve are externally mounted outside the engine valve cover.

Abstract: An engine control system includes a starting module, a position module, and a deactivation module. The starting module determines when a crankshaft starts to rotate and activates a control valve of a fuel pump when the crankshaft starts to rotate. The position module determines a position of the crankshaft and determines a position of a camshaft based on the position of the crankshaft. The camshaft drives the fuel pump. The deactivation module deactivates the control valve when the position module determines the position of the camshaft.

Abstract: An apparatus in a fuel path to assist in delivering fuel to an engine, the apparatus comprising: a fuel tank to contain a fuel and define a first end of the fuel path; a fuel rail to receive fuel and define a second end of the fuel path; a vacuum fuel pump to draw the liquid fuel from the fuel tank; a fuel injection pump to increase a pressure of the liquid fuel to an elevated fuel pressure before delivery of the fuel to the engine; and a check valve in the fuel path to retain fuel at the elevated fuel pressure in the fuel path. A fuel reservoir located between the vacuum fuel pump and the fuel injection pump in the fuel path, the check valve located within the fuel reservoir. The fuel injection pump is located downstream of the fuel reservoir. The fuel reservoir further comprises a fuel inlet and the check valve is located at the fuel inlet.

Abstract: A system and method provide dual level pressurization control of a fuel supply system based on whether fuel is being supplied to one or more secondary fuel loads. Fuel pump discharge backpressure is maintained above either a first minimum pressure value or a lower second minimum pressure value by determining whether fuel is being supplied to one or more secondary fuel loads. The fuel pump discharge pressure is maintained above the first minimum pressure value if it is determined that fuel is being supplied to the one or more secondary loads. The fuel pump discharge backpressure is maintained above the lower second minimum pressure value if it is determined that fuel is not being supplied to the one or more secondary loads.

Abstract: A fuel supply device for a gas engine is provided that includes a vaporizer, a primary regulator, a fuel changeover valve, a second inlet passage to which is introduced a second fuel fed out from a second fuel source, and a common outlet passage and can selectively connect the first and second inlet passages to the outlet passage, a common secondary regulator that regulates the pressure of the first fuel or second fuel so that it is at substantially atmospheric pressure and supplies it to a mixer, and a cutoff valve that opens/closes a fuel passage between the fuel changeover valve and the secondary regulator in response to operation/stopping of a gas engine, the vaporizer, the primary regulator, the fuel changeover valve, the cutoff valve, and the secondary regulator being integrally connected to each other to form a unit.

Abstract: A fuel supply equipment includes: a lid member provided with a fuel discharge pipe; a fuel pump held by the lid member and configured to suck in fuel within the fuel tank and discharge the fuel to an outside of the fuel tank from the fuel discharge pipe; a suction filter that filters the fuel within the fuel tank that will be sucked into the fuel pump; a fuel filter that removes foreign matter in the fuel discharged from the fuel pump; a pressure regulator configured to adjust a pressure of the fuel discharged from the fuel filter to a predetermined pressure and discharge excess fuel; a case configured to accommodate the fuel pump, the suction filter, the fuel filter, and the pressure regulator; and a supporting member provided to the lid member to support the case on the lid member.

Abstract: A fuel system that supplies fuel to an engine of a vehicle. The fuel system includes a pump that pumps fuel and a controller that selectively changes operation of the pump between an electronic returnless fuel system mode and a mechanical returnless fuel system mode. In the electronic returnless fuel system mode, the outlet of the pump is varied, and in the mechanical returnless fuel system mode, output of the pump is maintained approximately constant.

Abstract: A check valve for use with a pump is disclosed. The check valve may have a body at least partially defining a central bore with an open end and a closed end, and a spring guide separate from the body and disposed within the closed end of the central bore. The check valve may also have a spring located within the central bore and having a first end operatively engaged with the spring guide, and a valve element operatively engaged with a second end of the spring and being movable by a pressure differential to compress the spring. The spring guide may be moveable relative to the body.

Abstract: In an injection system having a device for metering fuel into an exhaust system of a Diesel engine, and a method for controlling the injection of fuel into the exhaust system, wherein the injection system has a high-pressure pump which feeds fuel to an accumulator under high pressure and injectors which inject fuel from the accumulator into the combustion chambers of the internal combustion engine, a fuel spray nozzle arranged in the exhaust system is in communication with the injection system via a fuel metering unit including a control valve and a metering valve and a pressure regulating valve is arranged between the control valve and the metering valve for controlling the pressure of the fuel being metered by the metering valve for injection into the exhaust system via the spray nozzle.

Abstract: A method and system for fuel delivery. The method and system may include one or more fuel storage tanks housing propane, one or more regulators through which fuel may flow and one or more fuel metering devices or systems. The flow of fuel from a fuel storage tank to an engine may be such that the engine runs in a clean and efficient manner.

Abstract: This fuel injector assembly (1) is used to inject fuel into a combustion chamber (52) of an engine. It comprises a needle control unit (14) adapted to actuate a needle (15) to deliver fuel to the chamber (52), an amplifier unit (13) adapted to increase the pressure of a quantity of fuel coming from an accumulator (3) of fuel under pressure and a cam (4) driven feeder unit (12) adapted to feed the accumulator (3) with fuel under pressure. No external pump is needed to feed the accumulator (3).

Abstract: At least one of a petroleum fuel and an alcohol fuel stored in a fuel tank is supplied to an internal combustion engine. Specifically, the fuel in the fuel tank is supplied to an injector by a fuel pump module. The injector injects the fuel into an intake pipe. An ECU adjusts a fuel injection quantity according to an alcohol concentration of the fuel. When the fuel-supply-pressure to the injector is less than or equal to a threshold pressure, the ECU determines the fuel pump module has a malfunction. Especially, the ECU varies the threshold pressure according to the alcohol concentration of the fuel.

Abstract: A fuel supply system that includes a fuel pump, a jet pump, a first device and a second device. The fuel pump has a first port, a second port and a third port. Each of the first and second ports is configured to discharge a pressurized fuel. The third port is configured to discharge a fuel vapor that may be produced within the fuel pump. The first port is coupled to an engine via a fuel supply passage. The first device is coupled between the second port and the jet pump and is operable to permit and prevent the supply of the pressurized fuel to the jet pump. The second device is coupled to the third port and is operable to permit and prevent the discharge of the fuel vapor to the outside of the second device.

Abstract: An embodiment of a direct injection assembly of the common-rail type provided with a fuel tank, a manifold, a high-pressure pump for feeding the fuel to the manifold, a low-pressure pump provided with an intake pipe and connected to the high-pressure pump by means of the intake pipe to feed the fuel taken from the tank to the high-pressure pump; and a shut-off valve of the ON/OFF type which is arranged along the intake pipe to adjust the delivery of the fuel fed to the high-pressure pump; and a pressure regulator, which is arranged along the intake pipe immediately upstream of the shut-off valve to keep the pressure of the fuel inside the intake pipe under a predetermined value.

Abstract: A fuel supply system includes a first non-return valve for a low-pressure delivery connection pipe and a second non-return valve for a pump supply pipe. The former non-return pipe does not allow fuel to flow from the low-pressure delivery pipe to the low-pressure supply pipe. The second non-return valve does not allow fuel to flow from pump supply pipe to the low-pressure supply pipe. Upon determining that air purging is necessary, an engine ECU operates a feed pump for approximately one second and then opens, for dummy injection, an in-cylinder injector and an intake manifold injector.

Abstract: The present invention includes a fuel supply apparatus having a pressure regulator for regulating a pressure of fuel supplied from a fuel pump to a target, such as an internal combustion engine of an automobile. The pressure regulator includes a first pressure chamber, a second pressure chamber and a third pressure chamber each configured to be able to receive a supply of the fuel from the fuel pump. A first diaphragm separates the first pressure chamber and the second pressure chamber from each other. A second diaphragm separates the second pressure chamber and the third pressure chamber from each other. The first pressure chamber has a discharge port that can discharge the fuel supplied into the first pressure chamber.

Abstract: A fuel supply system for an accumulator fuel injection system designed to inject fuel, as stored in an accumulator, into an internal combustion engine through a fuel injector The fuel supply system includes a feed pump working to pump the fuel out of a fuel tank and a fuel filter disposed between the feed pump and a high-pressure pump working to deliver the fuel to the accumulator. The fuel supply system also includes a return path and a control valve. When the pressure of the fuel between the fuel filter and the flow rate control valve exceeds a first set pressure, the control valve opens the return path to return the fuel from downstream to upstream of the feed pump to keep the pressure of fuel supplied to the flow rate control valve below the first set pressure, thereby controlling the flow rate of the fuel passing through the fuel filter.

Abstract: An engine having improved combustion characteristics is provided. The engine includes a fuel injection system that is variable between two operational states. In the first operating state, the fuel injectors provide a fuel spray having first spray pattern characteristics. When the system detects that an operation characteristic exceeds a threshold, the fuel injectors are displaced into a second operating state. In the second operating state, the fuel injectors provide a spray pattern having first spray pattern characteristics. The combustion cycle may be characterized by timing the fuel injection so that the fuel is sprayed into the cylinder early in the compression stroke. Further still, the combustion cycle may be characterized by controlling the fuel pressure so that the fuel pressure is inversely related to the load on the engine.

Abstract: A fuel supply apparatus of an internal combustion engine is provided which can discharge air bubbles or air from within fuel supply paths while increasing pressure within a common rail up to a predetermined pressure level before a start of the internal combustion engine, can reduce a period of time of cranking from when an ignition switch is switched on and which can reduce noise that occurs when the air bubbles or air are being discharged. The fuel supply apparatus is provided with a flow rate control valve that adjusts a flow rate of fuel supplied to the common rail and a pressure control valve that reduces the pressure within the common rail.

Abstract: In a method for controlling a fuel-supply system, a first supply unit supplies fuel from a storage container to a second supply unit. At least a partial quantity of the fuel quantity supplied by the first supply unit returns to the storage container as return quantity via a return line. The return quantity is determined as a function of the operating state of the fuel-supply system. The first supply unit is controlled at least as a function of the return quantity.

Abstract: A method is provided for operating an internal combustion engine arrangement and to an internal combustion engine arrangement, which includes, but is not limited to an internal combustion engine, which can be operated with gaseous fuel, a pressure reducer for reducing the gas pressure of the gaseous fuel, which is fed to the internal combustion engine.

Abstract: The present invention relates to systems and methods for pressurization of a fuel line of an engine. In one embodiment, a fuel charging system for an engine is provided. The fuel charging system includes a first fuel pump in fluid communication with a fuel tank to generate a first fluid pressure within a first fuel line. The fuel charging system also includes a second fluid pump having a reciprocating piston including a low pressure end and a high pressure end. The low pressure end is in fluid communication with the first fuel pump through the first fuel line and the high pressure end is in fluid communication with an engine fuel rail through a second fuel line. The reciprocating piston is driven by the first fluid pressure to generate a second fluid pressure within the second fuel line, wherein the second fluid pressure is greater than the first fluid pressure.

Abstract: An ECU reduces a fuel flow rate discharged from an electric pump to the filter when a fuel temperature and a fuel pressure in the filter detected by a sensor portion drop. Since a mechanical pump continues to be driven without respect to the fuel quantity discharged from the electric pumps when the fuel flow rate discharged from the electric pump is decreased, a suction pressure is generated at an inlet of the filter. The fuel in a recirculation passage is introduced into the filter through a branch passage. As the result, relatively high temperature fuel is introduced into the filter to melt a solidified fuel causing a clogging of the filter.

Abstract: A system and method provide dual level pressurization control of a fuel supply system based on whether fuel is being supplied to one or more secondary fuel loads. Fuel pump discharge backpressure is maintained above either a first minimum pressure value or a lower second minimum pressure value by determining whether fuel is being supplied to one or more secondary fuel loads. The fuel pump discharge pressure is maintained above the first minimum pressure value if it is determined that fuel is being supplied to the one or more secondary loads. The fuel pump discharge backpressure is maintained above the lower second minimum pressure value if it is determined that fuel is not being supplied to the one or more secondary loads.

Abstract: A shut-off valve of the flow rate of a fuel pump for an internal combustion engine; the shut-off valve is provided with: a tubular cylindrical body, which is closed on top, displays a cylindrical seat, the lower portion of which performs the function of fuel pipe, and comprises a number of radial through holes to allow the introduction of fuel within the cylindrical seat; a lower plate, which is arranged within the tubular cylindrical body and underneath the radial holes and has a central through hole which defines an outlet opening of the fuel; and a cylindrical shutter, which is coupled to the lower plate and is mobile between an open position, in which the outlet opening is in communication with the radial holes, and a closed position, in which the outlet opening is isolated from the radial holes.

Abstract: A fuel system comprises a fuel line that supplies fuel to an engine at a fuel line pressure. A first fuel pump selectively supplies fuel to the fuel line at a first pressure. A second fuel pump selectively supplies fuel to the fuel line at a second pressure that is greater than the first pressure. A check valve having an inlet in communication with an exit port of the first fuel pump and an outlet in communication with the fuel line is positioned based on the fuel line pressure and the first pressure.

Abstract: At abnormal pressure pulsation generating time, a piston of a pulsation reducing apparatus is displaced in a valve chamber due to an increase in a fuel pressure in an upstream side fuel passage, so that fluid communication between a valve chamber and a downstream side fuel passage is disabled, and fluid communication between a valve chamber side end part of a return passage and the valve chamber is enabled. Pressure pulsation is conducted into the return passage and is reduced by a damping effect of a pulsation reducing mechanism and a flow restricting effect of orifices. The fuel, which has passed through the orifices, is returned to the upstream side fuel passage through the return passage.

Abstract: A fuel injection system operates under a predetermined substantially constant pump speed and creates multi-pressure levels by diverting the fuel flow. Fuel pressure can be switched from one steady pressure level to another level on-demand instantly. This superimposes and overlaps typical fuel injection events in the linear operating ranges under different pressure levels, significantly increasing the fuel injection dynamic range. The dynamic range is further increased when another predetermined constant pump speed is assigned. Thus, the system saves fuel and reduces exhaust emission in city driving when gas pedal is released including idle. The same system can instantly deliver additional fuel on-demand for extra power beyond engine rating producing a sport-car-like performance.

Abstract: A method for controlling a mechanical solenoid valve of a high-pressure fuel pump to supply fuel to an engine is provided. The method includes: during an idle condition, adjusting a pull-in current of the mechanical solenoid valve utilized to control closing of the mechanical solenoid valve based on a fuel pressure downstream of the high-pressure fuel pump, wherein the pull-in current is reduced when possible while enabling the mechanical solenoid valve to close as indicated by an increase in the downstream fuel pressure.

Abstract: The inventive discharge rate and pressure control solenoid valve (1) is used for a circuit consisting of a low pressure part and a high-pressure part and controls the discharge rate of a low-pressure fluid with the aid of a sliding spool (18) in a liner (22) provided with at least one fluid feeding orifice (20) and one fluid exhausting orifice (21) respectively. Said spool (18) is electrically actuated by means of an electromagnet acting in an opposite direction to recoil means (26) for closing the passage between the feeding (20) and exhausting (21) orifices when a control current for the electromagnet is equal to zero and for gradually opening said passage according to a threshold value of the flow, the pressure control being applicable to a high-pressure fluid.

Abstract: A method of controlling an air to fuel ratio of an internal combustion engine may include receiving a request for a modification of a first flow of fuel to at least one combustion chamber, modifying the first flow of fuel in response to the request, receiving a first signal indicative of a first air supply condition, displacing a second flow of fuel in response to receiving the signal and controlling the modification of the first flow of fuel by the displacement of the second flow of fuel.

Abstract: A fuel-feeding device may preferably include a reservoir cup disposed in a fuel tank that contains liquid fuel therein, a fuel pump capable of feeding the liquid fuel contained in the reservoir cup to an engine, a pressure regulator capable of controlling a fuel pressure of the liquid fuel fed to the engine from the fuel pump, a jet pump arranged and constructed to receive a part of the pressurized liquid fuel pumped from the fuel pump via a fuel jet path, so as to introduce liquid fuel outside the reservoir cup into to the reservoir cup with the aid of flow of the pressurized liquid fuel, and a flow rate control valve disposed in the fuel jet path. The flow rate control valve is arranged and constructed to control a flow rate of the pressurized liquid fuel fed to the jet pump depending upon a pumping rate of the pressurized liquid fuel pumped from the fuel pump.

Abstract: A fuel supply system includes a pressure regulator (16) regulating the pressure of fuel supplied from a fuel pump (14). A valve device (18) is associated with the pressure regulator (16) for controlling the pressure of the fuel regulated by the pressure regulator (16). The valve device (18) supplies a part of the fuel as a control fluid to the pressure regulator (16). The part of the fuel supplied from the valve device (18) as the control fluid is not discharged into a fuel tank (12) when the pressure regulator (16) regulates the pressure of the fuel to have a higher value.

Abstract: A first fuel value (FL_Signal) indicative of the quantity of fuel presently in a fuel tank (34) and a second fuel value (FL_LOW_THLD) representing a quantity of fuel in the tank at which a maximum Injection Control Pressure (ICP) limit should be changed are processed by a processor (22). When the result of the processing discloses that the second fuel value is less than the first fuel value, the maximum ICP limit is reduced from a greater value (ICPC_NORMAL_LMX) to a lesser value (ICPC_FL_LMX).

Abstract: Secondary fuel filter (143) provided downstream of a fuel pump (92) has a smaller pore size than a primary fuel filter (141) provided upstream of the fuel pump. The secondary fuel filter is covered with a case member (171) and positioned along a center frame (23) of the vehicle. The secondary fuel filter is made of non-woven fabric and formed in a bag shape, and fuel is filtered by the secondary fuel filter as it passes from the interior to the outside of the filter.

Abstract: A fuel feed system of an engine is provided with a gas-fuel separating unit for separating oil mist generated in an engine case from air with a labyrinth, and an auto fuel cock is operated by pressure pulsation of the air from which the oil mist is separated by the gas-liquid separating unit. Thus, infiltration of the oil mist into the auto fuel cock is suppressed to the minimum, and a malfunction of the auto fuel cock caused by accumulation of the oil can be prevented. Additionally, a breather passage for feeding the air, from which the oil mist is separated by the gas-liquid separating unit, to a breathing unit is connected the auto fuel cock via a negative pressure tube. Thus, it is unnecessary to provide a specific passage for transmitting the pressure pulsation of the air in the engine case to the auto fuel cock.

Abstract: On-off valve intended to be arranged at the outlet of the gas accumulation reservoir in an electronic gas injection system for an internal combustion engine, presenting a valve member made of metallic material, co-operating with a valve seat made in a body, which is also made of metallic material, to ensure the good quality of tightness in all operative temperature and pressure conditions, with prolonged reliability in time.