A high-pressure fuel pump includes a pressure-limiting valve that opens from a high-pressure region of the high-pressure fuel pump towards a compression chamber or towards a low-pressure region of the high-pressure fuel pump. The pressure-limiting valve includes a valve body with a valve seat surface that tapers against the opening direction of the pressure-limiting valve, a spherical valve element, and a valve spring, which presses the spherical valve element against the opening direction of the pressure-limiting valve towards the valve seat surface. When the pressure-limiting valve is closed, the valve element and the valve seat surface bear against one another over a contact line, and a gap is formed between the valve element and valve body, next to the contact line. This gap is asymmetrically narrower upstream of the contact line than downstream of the contact line.

An electronic fuel injection type diesel engine enables reduction in engine size. The electronic fuel injection type diesel engine is provided with: a combustion chamber inside a cylinder; a fuel injection chamber inside a cylinder head; a fuel injector that injects liquid fuel into the fuel injection chamber; a fuel accumulation unit that accumulates the liquid fuel injected from the fuel injector; and an electronic control unit that controls a timing and an amount of injection of the liquid fuel.

A multipoint fuel injection system comprises an injection system segment including a circumferentially extending outer support defining a fuel manifold with a plurality of manifold passages extending circumferentially therethrough. A first connector is included at a first circumferential end of the outer support and a second connector is included at a second circumferential end of the outer support opposite the first circumferential end. The first and second connectors are each configured to connect each manifold passage with a manifold passages of a respective outer support of a circumferentially adjacent injection system segment. The system includes a circumferentially extending inner support and a plurality of circumferentially spaced apart feed arms extending radially between the inner support and the outer support. A plurality of outlet openings extend in an axial direction from each feed arm for feeding respective injection nozzles.

Method and apparatus for adjustable fuel pressure module. In accordance with an embodiment of the present invention, an apparatus for regulating fuel pressure comprises a body configured to mate to a fuel filter housing, a spring seat assembly configured to seal an opening in the fuel filter housing according to a force applied by a pressure regulating spring acting on the spring seat assembly, and a pressure regulating spring adjusting assembly mounted to the body, configured to constrain an adjustable length of the pressure regulating spring, wherein the spring is constrained between the spring seat assembly and the pressure regulating spring adjusting assembly. A force exerted upon the spring seat assembly by the pressure regulating spring corresponds to a desirable fuel pressure. The spring seat assembly is configured to unseal the opening in the fuel filter housing responsive to a fuel pressure greater than the desirable fuel pressure.

An isolation mechanism for isolating a submerged pump in a storage vessel, where the isolation mechanism comprises a primary valve member and a secondary valve member, which are both biased in a fail-closed position. The isolation mechanism allows for redundancy for safety and reliability, and can be operated externally of the storage vessel. Furthermore, the isolation mechanism comprises venting and purging devices for safe operation of removal and installation of the pump in the storage vessel.

An electric gear pump comprising: a gerotor rotatable about an axis of rotation A; a support base for the gerotor; a cover which can be joined to the base; a feed duct and a delivery duct; electronic components of the control unit which are fastened on the outer surface of the cover; wherein the feed and delivery ducts are at least partly formed in the cover and comprise an axial section parallel to the axis A and a radial section parallel to the outer surface of the cover; wherein the outer surface of the cover comprises an inset portion; wherein at least a portion of the radial sections of the feed and delivery ducts is configured so as to project externally from the inset portion of the outer surface of the cover and form projecting support portions for the electronic components of the control unit.

A method for requirement-based servicing of an injector in a common-rail system in which, during ongoing operation of the engine, a current operating point is stored as a function of the rail pressure and of the fuel injection mass, and the current operating point is multiplied by a damage factor and is stored as a reference injection cycle as a function of the rail pressure as well as of the fuel injection mass. A total reference injection cycle is calculated by forming sums over the reference injection cycles, and a load factor is calculated as a function of the total reference injection cycle and the permissible injection cycles, and the load factor is set as decisive for the servicing recommendation of the injector.

An estimation unit estimates a fuel pressure on a discharge side of a high-pressure pump based on an amount of fuel injection with a fuel injection valve from a time point at which a detected fuel pressure changes from a higher status than a first pressure to a lower status, assuming that the fuel has not been discharged with the high-pressure pump. The determination unit determines that a relief valve is in an open status based on a dropping mode of the estimated fuel pressure and a dropping mode of the detected fuel pressure.

The invention relates to a device for supplying a gaseous fuel to an engine that comprises a gas accumulator for receiving highly pressurized gaseous fuel, a gas buffer for receiving medium pressurized gaseous fuel, a gas supply device for delivering a gaseous fuel into an engine combustion space, a first gas line that connects the gas accumulator to the gas buffer and whose gas flow can be regulated via a first valve, a second gas line that connects the gas accumulator to the gas buffer and whose gas flow can be regulated via a second valve, and a third gas line that connects the gas buffer to the gas supply device. The device is further characterized in that a compressor is arranged in the second gas line to increase a pressure of a gaseous fuel flowing from the gas accumulator to the gas buffer.

Provided is a high-pressure fuel supply pump capable of reducing a manufacturing cost of a part for holding a metal damper. The high-pressure fuel supply pump includes a pump body 1 having a pressurizing chamber 11 therein, a damper cover 14 forming a damper chamber 10 together with the pump body 1 on the upstream side of the pressurizing chamber 11, a metal damper 9 that is disposed in the damper cover 10 and formed by laminating two metal diaphragms, and a first holding member 9a that is disposed in the damper chamber 10 and presses and holds the metal damper 9 from one side. The first holding member 9a includes a first regulation portion that regulates the radial movement of the metal damper 9, and a second regulation portion that regulates the radial movement of the first holding member 9a in the damper chamber 10. At a position of the second regulation portion, a flow path is formed which allows the fuel in the damper chamber 10 to circulate to both surfaces of the metal damper 9.