Skylark L4-144 2.4L DOHC VIN T SFI (1997)
Fuel Pressure Regulator: Description and Operation
Description
The fuel pressure regulator assembly is a diaphragm-operated relief valve with fuel pump pressure on one side, and regulator spring pressure and intake
manifold vacuum on the other side. The regulator's function is to maintain a constant pressure differential across the injectors at all times. The pressure
regulator compensates for engine load by increasing fuel pressure as engine vacuum drops. With the ignition ON and engine OFF (zero vacuum), fuel
pressure should be 284-325 kPa (41-47 psi).
Service
The fuel pressure regulator is serviced as a complete assembly.
Incorrect Fuel Pressure
Whenever the pressure is too low, poor performance and a DTC P0171 could result. Whenever the pressure is too high, excessive odor and a DTC
P0172 could result.
