PUMP, Fuel Injection: Operation: Operation

The high pressure pump is gear driven and requires no timing. Fuel that enters the high pressure pump is pressurized between 200-1800 bar (2, 900 - 26, 106 psi). The pressurized fuel is then supplied to the fuel rail. The high pressure pump and flange located behind the pump are supplied as an assembly. Fuel passages and control elements in the flange regulate the flow of fuel to the high pressure pumping chambers, and control the lubrication of the pump.