A fuel injection pump pressurizes and injects fuel. A cam rotates about a rotational axis of the cam. A housing includes a cam chamber that houses the cam and a sliding chamber communicated to the cam chamber. A roller rotates while being in contact with a surface of the cam. A shoe reciprocates in the sliding chamber by rotation of the cam and is in contact with and slides on a surface of the roller. A plunger reciprocates with the shoe. A cylinder houses the plunger and includes a pump chamber to pressurize and feed the fuel by reciprocation of the plunger. A deformed section is a groove or a protrusion which extends in a direction of a rotational axis of the cam, on a part of a surface of the cam, and has a shape different from a cam profile of the cam.

A method comprises determining either the coefficient for the equation relating the injection timing distance of a bushing to the angle of rotation of a shaft of an engine, or the desired effective injection stroke reduction; and calculating at least one of the following: the modified injection timing distance by multiplying the desired angle of retardation of the injection timing by the coefficient and adding that product to the original injection timing distance of the bushing, and the modified injection duration distance by subtracting the desired effective injection stroke reduction from the original injection duration distance.

A fuel system for an internal combustion engine includes a nozzle, a fuel pump, a spill valve assembly, and a pumping control unit. The spill valve assembly includes a first spill valve and a second spill valve fluidly in parallel between a plunger cavity in the fuel pump and a low pressure space. A pumping control unit commands closing of the first spill valve and then the second spill valve to adjust the spill valve assembly to start pressurization in the fuel pump, and commands opening the first spill valve to end pressurization in the fuel pump. A pumping duration is determined based on a timing of the commanded closing of the second spill valve and a timing of the commanded opening of the first spill valve.

A nozzle assembly for a fuel injector includes an injector housing having a casing and a stack within the casing, an outlet check movable within a nozzle cavity in the injector housing, and having a stop positioned within a stop cavity. A clearance is formed between the outlet check and the injector housing and fluidly connects a spring cavity to a stop cavity, and an anti-cavitation vent is formed in the stack and fluidly connects the spring cavity to a low pressure space. The anti-cavitation vent limits pressure changes in the spring cavity during fuel injection such that production of cavitation bubbles in the spring cavity is limited.

A nozzle assembly for a fuel injector includes an injector housing having a casing and a stack within the casing, an outlet check movable within a nozzle cavity in the injector housing, and having a stop positioned within a stop cavity. A clearance is formed between the outlet check and the injector housing and fluidly connects a spring cavity to a stop cavity, and an anti-cavitation vent is formed in the stack and fluidly connects the spring cavity to a low pressure space. The anti-cavitation vent limits pressure changes in the spring cavity during fuel injection such that production of cavitation bubbles in the spring cavity is limited.

A fuel system for an internal combustion engine includes a nozzle, a fuel pump, a spill valve assembly, and a pumping control unit. The spill valve assembly includes a first spill valve and a second spill valve fluidly in parallel between a plunger cavity in the fuel pump and a low pressure space. A pumping control unit commands closing of the first spill valve and then the second spill valve to adjust the spill valve assembly to start pressurization in the fuel pump, and commands opening the first spill valve to end pressurization in the fuel pump. A pumping duration is determined based on a timing of the commanded closing of the second spill valve and a timing of the commanded opening of the first spill valve.

A gasoline fuel supply system includes a feed pump part, an inline pump part, and a high-pressure pump part. The feed pump part includes a non-positive displacement electric pump, and pumps a gasoline fuel from a fuel tank and discharges at a feed pressure. The inline pump part includes a non-positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the feed pump part and discharges at a middle pressure. The high-pressure pump part includes a positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the inline pump part and discharges at a supply pressure to a fuel injection valve.

A gasoline fuel supply system includes a feed pump part, an inline pump part, and a high-pressure pump part. The feed pump part includes a non-positive displacement electric pump, and pumps a gasoline fuel from a fuel tank and discharges at a feed pressure. The inline pump part includes a non-positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the feed pump part and discharges at a middle pressure. The high-pressure pump part includes a positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the inline pump part and discharges at a supply pressure to a fuel injection valve.

A gasoline fuel supply system includes a feed pump part, an inline pump part, and a high-pressure pump part. The feed pump part includes a non-positive displacement electric pump, and pumps a gasoline fuel from a fuel tank and discharges at a feed pressure. The inline pump part includes a non-positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the feed pump part and discharges at a middle pressure. The high-pressure pump part includes a positive displacement mechanical pump, and pressurizes the gasoline fuel discharged from the inline pump part and discharges at a supply pressure to a fuel injection valve.