A fuel system for an internal combustion engine includes a fuel injector having a nozzle with first and second sets of spray orifices formed therein. The fuel injector also includes a first and a second outlet check movable to open and close the first and second sets of spray orifices. Spray plume ducts are supported at fixed orientations relative to a nozzle of the fuel injector, and each are oriented in-line with a center axis defined by one of the spray orifices. The spray plume ducts may be directly attached to the fuel injector or to a duct carrier mounted to an engine head.

A fuel system for an internal combustion engine includes a fuel injector having a nozzle with first and second sets of spray orifices formed therein. The fuel injector also includes a first and a second outlet check movable to open and close the first and second sets of spray orifices. Spray plume ducts are supported at fixed orientations relative to a nozzle of the fuel injector, and each are oriented in-line with a center axis defined by one of the spray orifices. The spray plume ducts may be directly attached to the fuel injector or to a duct carrier mounted to an engine head.

Various embodiments include a high-pressure fuel pump for a fuel injection system comprising: a housing defining a housing bore with a pressure chamber in a first end region and a leakage chamber in a second end region; a pump piston, during operation of the high-pressure fuel pump moved in translation between the pressure chamber and the leakage chamber along an axis; wherein the leakage chamber includes a leakage collecting region and an equalizing region arranged in circular annular fashion around the pump piston guiding section and extending parallel to the axis from the leakage collecting region toward the pressure chamber; and a low-pressure damper arranged in the equalizing region, the low-pressure damper comprising an annular piston damper and an annular piston guided to move along the axis within an annular bushing.

A fuel supply system, having a low-pressure region, a high-pressure region, a pumping device, a low-pressure pump, and a high-pressure pump A pressure accumulator system is provided between the pumping device and injectors and has distributor units. Between the low-pressure pump and the high-pressure pump, a fuel distributor block is provided, which has a fuel leakage collection line for fuel leakage supplied to the fuel distributor block that has a choke and a bypass around the choke and a leakage sensor in the bypass. The choke is dimensioned such that all fuel leakage flows through the choke if the fuel leakage conducted via the fuel leakage collection line is less than a limit value, and fuel leakage flows through the bypass and across the leakage sensor if the fuel leakage conducted via the fuel leakage collection line is greater than the limit value.

Various embodiments include a high-pressure fuel pump for a fuel injection system comprising: a housing defining a housing bore with a pressure chamber in a first end region and a leakage chamber in a second end region; a pump piston, during operation of the high-pressure fuel pump moved in translation between the pressure chamber and the leakage chamber along an axis; wherein the leakage chamber includes a leakage collecting region and an equalizing region arranged in circular annular fashion around the pump piston guiding section and extending parallel to the axis from the leakage collecting region toward the pressure chamber; and a low-pressure damper arranged in the equalizing region, the low-pressure damper comprising an annular piston damper and an annular piston guided to move along the axis within an annular bushing.

An accumulator clamp for an accumulator assembly in an engine assembly is disclosed. The accumulator assembly further includes an accumulator body and a fuel line adapter connected thereto, and the accumulator assembly is mountable into a cylinder head accumulator bore of a cylinder head. The accumulator clamp includes a clamp body having a clamp accumulator bore receiving an end of the accumulator body, and a bolt bore on either side of the clamp accumulator bore for receiving threaded portions of accumulator mounting bolts that secure the accumulator assembly to the cylinder head. The bolt bores include bolt slots through the walls of the accumulator body so that the threaded portions of the accumulator mounting bolts are insertable into and removable from the bolt bores through the bolt slots to allow installation and removal of the accumulator assembly without disassembling components of the engine assembly around the cylinder head.

A fuel supply system having a low pressure region, a pumping device to deliver fuel from the low pressure region to a high pressure region. In the high pressure region between the pumping device and injectors there is a pressure storage system that is permanently under high pressure. The pressure storage system has a plurality of distributor units each with at least three connections connected in series. A respective injector connection of each distributor unit is connected to at least one injector each via a high pressure line that is under high pressure at times dependent on the injection cycle. Each distributor unit of the pressure storage system is assigned an individual leakage detection device. Each distributor unit is assigned a non-return valve, which allows a leakage flow starting out from the respective distributor unit in the direction of the pumping device.

A fuel injection equipment for an internal combustion engine is piloted by a central electronic unit, the equipment includes a piloted low pressure pump drawing the fuel from a low pressure tank and sending the fuel toward a piloted inlet valve controlling the inlet of a high pressure pump which pressurizes the fuel and sends it pressurized toward a manifold to which is connected at least one injector. The equipment also includes a high pressure accumulator, distinct from the manifold, and a piloted high pressure valve in fluid communication between the outlet of the high pressure pump and the manifold so that the high pressure accumulator stores and delivers pressurized fuel to the manifold.

An accumulator clamp for an accumulator assembly in an engine assembly is disclosed. The accumulator assembly further includes an accumulator body and a fuel line adapter connected thereto, and the accumulator assembly is mountable into a cylinder head accumulator bore of a cylinder head. The accumulator clamp includes a clamp body having a clamp accumulator bore receiving an end of the accumulator body, and a bolt bore on either side of the clamp accumulator bore for receiving threaded portions of accumulator mounting bolts that secure the accumulator assembly to the cylinder head. The bolt bores include bolt slots through the walls of the accumulator body so that the threaded portions of the accumulator mounting bolts are insertable into and removable from the bolt bores through the bolt slots to allow installation and removal of the accumulator assembly without disassembling components of the engine assembly around the cylinder head.

A fuel supply system having a low pressure region, a pumping device to deliver fuel from the low pressure region to a high pressure region. In the high pressure region between the pumping device and injectors there is a pressure storage system that is permanently under high pressure. The pressure storage system has a plurality of distributor units each with at least three connections connected in series. A respective injector connection of each distributor unit is connected to at least one injector each via a high pressure line that is under high pressure at times dependent on the injection cycle. Each distributor unit of the pressure storage system is assigned an individual leakage detection device. Each distributor unit is assigned a non-return valve, which allows a leakage flow starting out from the respective distributor unit in the direction of the pumping device.