Fuel Pressure Test

Pressure Relief/Rollover Valve:

Fuel systems on gas powered engines are equipped with a fuel tank module mounted, combination fuel filter/fuel pressure regulator. The fuel pressure regulator is a mechanical device that is not controlled by the powertrain control module (PCM) or engine vacuum.

With engine at idle speed, system fuel pressure should be approximately 241-310 kPa (35-45 psi).

Fuel Pressure Regulator Location:

1. Remove (unscrew) the protective plastic cap from the pressure test port on the fuel rail. This test port is located at the rear of the engine.

Fuel Pressure Test - Typical:

Connect the 0-414 kPa (0-60 psi) fuel pressure gauge (from Gauge Set 5069) to test port pressure fitting on fuel rail.
2. With engine running, note pressure gauge reading. Fuel pressure should be approximately 241-310 kPa (35-45 psi) at idle.
3. If pressure is at 0 psi, connect DRB scan tool and check to see if the relay is actuating properly. Refer to Computers and Control Systems/Testing and Inspection/Procedures.
4. If operating pressure is above 45 psi, fuel pump is OK. Replace fuel filter/fuel pressure regulator assembly.