Fuel Pressure Regulator

Fuel Pressure Regulator:

The cartridge type fuel pressure regulator is a diaphragm-operated relief valve with fuel pump pressure on one side, and pressure regulator spring, and intake manifold vacuum on the other side. The regulators function is to maintain a constant fuel pressure across the injectors at all times. The pressure regulator compensates for engine load by increasing fuel pressure as engine vacuum drops

The cartridge regulator is serviced as a separate component. When servicing the fuel pressure regulator, ensure that the filter screen and the O-rings are properly placed on the pressure regulator.

If the fuel pressure is too low, reduced performance and DTC P0171 could result. If the pressure is too high, excessive odor and DTC P0172 may result. Refer to Fuel System Pressure Test for information on diagnosing fuel pressure conditions.