Fuel Pressure Regulator: Description and Operation

The fuel pressure regulator contains a diaphragm, calibrated spring and a fuel return valve. The regulator is mounted in the fuel pump module.

The fuel system uses a nonadjustable pressure regulator that maintains fuel system pressure at approximately 400 kPa (58 psi). The spring pushes down on the diaphragm and closes off the fuel return port. System fuel pressure reflects the amount of fuel pressure required to open the return port.

The pressure regulator is a mechanical device that is NOT controlled by the PCM or engine vacuum.