F 350 4WD Super Duty V8-6.0L DSL Turbo VIN P (2004)
Fuel Pressure Regulator: Description and Operation
FUEL PRESSURE REGULATOR
Fuel Pressure Regulator
Fuel pressure in the cylinder head fuel galleries is maintained by a fuel pressure regulator. The fixed orifice is an air bleed. 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 be 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.
