Fuel Pressure Regulator

FUEL PRESSURE REGULATOR







Fuel pressure in the cylinder head fuel galleries is controlled by a fuel pressure regulator. The fixed orifice is an air bleed in the fuel filter housing. It is the highest point in the fuel system. It allows the air behind the fuel pressure regulator to be vented to the fuel tank rather than ingested in the fuel galleries. The fuel pressure regulator contains a spring-loaded poppet valve, which opens to allow excess fuel to return to the fuel-conditioning module. Once back to the fuel-conditioning module, the fuel is sent back to the fuel tank or to the engine, if the fuel-conditioning module is in recirculation mode.