Fuel Pressure: Testing and Inspection

Fuel Pump Fuse:

NOTE: To obtain an accurate fuel pressure reading the engine must by running. Basic fuel pump operation can be verified in a no start condition by observing gauge reading while cranking engine. Fuel pressure should be approximately 294 kPa (43 psi).

1. Remove fuel pump fuse from underhood fuse box.
2. Start engine.
3. When engine stalls, crank or attempt to restart engine 2 or 3 times to release pressure.
4. Turn ignition switch off and reinstall fuel pump fuse.

NOTE: Steps 1 through 4 are provided to release fuel system pressure to eliminate fuel spray.

Fuel Pressure Test:

5. Disconnect fuel line from fuel filter and connect a suitable pressure gauge as shown.

Fuel Pressure Regulator Hose:

6. Disconnect and plug vacuum line from fuel pressure regulator. Connect vacuum pump to pressure regulator.
7. Start engine and idle.
8. Fuel pressure should be approx. 294 kPa (43 psi).
9. Slowly apply vacuum to the pressure regulator while watching fuel pressure.
10. Fuel pressure should decrease as vacuum increases, down to approx. 245 kPa (36 psi) at 68kPa Hg. (20 in.Hg).
11. If fuel pressure does not respond to the application of vacuum, check fuel return line for restrictions prior to replacing fuel pressure regulator. If fuel pressure stays constantly low, check fuel filter for restrictions.