High Pressure Fuel Pump

WARNING: This page is about a different variant/trim than selected.

When the High Pressure (HP) fuel pump is rotated, pressure is created when the fuel metering valve is open and the fuel rail Pressure Control Valve (PCV) is closed. Both valves are electronically controlled by the PCM to allow variable fuel delivery and pressure control.

When the PCM actuates the fuel injectors, the fuel rail pressure drop is off-set by additional fuel being delivered to the fuel rails by the fuel rail PCV. The fuel pressure in the system is reduced within a few seconds after the engine has stopped as the fuel rail PCV no longer has the holding current it requires, and therefore opens. No residual pressure remains in the system and the fuel is released into the Low Pressure (LP) fuel return line through the open fuel rail PCV.