Fuel Pressure Regulator Assembly

Fuel Pressure Regulator Assembly:

The fuel pressure regulator is a diaphragm-operated cartridge relief valve with the fuel pump pressure on one side and the regulator spring pressure and intake manifold vacuum on the other. A retainer holds the fuel pressure regulator.

The function of the regulator is to maintain a constant pressure differential across the injectors at all times. The pressure regulator compensates for engine load by increasing the fuel pressure as engine vacuum drops.

With the ignition ON leaving the engine OFF, with zero vacuum, the fuel pressure at the pressure test connection should be 385-43O kPa (56-62 psi). If the pressure is too low, poor performance could result. If the pressure is too high, excessive odor may result. The fuel system diagnosis has information on diagnosing fuel pressure conditions. Refer to Fuel System Diagnosis.