Low noise fuel injection pump

A high-pressure fuel pump assembly comprising:

• a pump bushing defining a pumping chamber;
• a plunger that is moveable within the pumping chamber for pressurizing an amount of fuel, the plunger and the pump bushing sharing a common axis;
• a cam follower piece having a cavity formed in one end, the cam follower piece being adapted for continuous dynamic contact at another end with a moveable engine component;
• wherein the cam follower piece includes a first compliance device that is configured for absorbing a hydraulic noise component along the common axis, and wherein the first compliance device is one of a spring washer and a press-fit spring device providing a predetermined spring force along the common axis of motion for achieving the absorbing of the hydraulic noise component.

A vehicle comprising:

• an internal combustion engine;
• a transmission operatively connected to the internal combustion engine for propelling the vehicle;
• a fuel rail having at least one fuel injector device configured for injecting an amount of pressurized fuel into the internal combustion engine for combustion therein;
• and
• a fuel pump assembly for delivering the amount of pressurized fuel to the fuel rail, the fuel pump assembly having a pump bushing defining a pumping chamber and a plunger that is moveable within the pumping chamber for pressurizing an amount of fuel to produce the amount of pressurized fuel;
• wherein the fuel pump assembly is configured with at least one compliance device configured for absorbing a hydraulic noise component within the fuel pump assembly, wherein the at least one compliance device includes a cavity adapted for use as a hydraulic accumulator for increasing a dead volume within at least one of the pump bushing and the plunger, the cavity being in fluid communication with the pumping chamber via a control orifice.