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 37 psi (255 kPa).

1. Remove fuel pump fuse from 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 Testing:

5. Disconnect pressure regulator solenoid electrical connector.
6. Start engine and idle, observe pressure reading. Gauge should read approximately 30 psi (206 kPa).
7. Momentarily snap throttle to wide open while observing gauge reading. Gauge should read 37 psi (255 kPa).
8. Stop engine and disconnect and plug pressure regulator vacuum hose.

If desired results were not achieved, replace fuel pump. If readings were correct continue test.

Fuel Pressure Testing:

9. Using a suitable test wire, jumper ECU terminal 108 to ground.
10. Connect handheld vacuum pump to pressure regulator.
11. Turn ignition on and observe gauge reading. Gauge should read 36 - 37 psi (248 - 250 kPa).
12. Apply 10 in.Hg vacuum to pressure regulator. Gauge reading should be 31 - 32 psi (213 - 221 kPa).
13. Apply 20 in.Hg vacuum to pressure regulator. Gauge reading should be 26 - 28 psi (179 - 193 kPa).

Fuel pressure should decrease as vacuum increases. If results are not satisfactory, replace pressure regulator.