Fuel Pressure Regulator: Description and Operation

Fuel Pressure Regulator
The fuel pressure regulator is a diaphragm-operated relief valve mounted on the fuel rail with fuel pump pressure on one side and manifold pressure on the other side.The fuel pressure regulator maintains the fuel pressure available to the injector at three times barometric pressure adjusted for engine load.It may be serviced separately.
If the pressure is too low, poor performance and a DTC P0131, DTC P0151, DTC P0171 or DTC P1171 will be the result.If the pressure is too high, excessive odor and/or a DTC P0132, DTC P0152, DTC P0172 will be the result.Refer to Fuel System Diagnosis for information on diagnosing fuel pressure conditions.