Fuel Pressure: Testing and Inspection

Fuel Pressure Test

Special Tools Required
- Fuel pressure gauge 07406-004000A
- Fuel pressure gauge attachment O7VAJ-0040100

1. Make sure you have the anti-theft codes for the radio and the navigation system, then write down the frequencies for the radio's preset buttons.
2. Disconnect the negative cable from the battery.
3. Remove the fuel fill cap.
4. Remove the intake manifold cover.





5. Place a wrench on the fuel pulsation damper (A).
6. Place a rag or shop towel (B) over the fuel pulsation damper.
7. Slowly loosen the fuel pulsation damper one complete turn.





8. Remove the fuel pulsation damper from its fitting, and attach the fuel pressure gauge attachment.





9. Attach the fuel pressure gauge.
10. Reconnect the negative battery cable, then start the engine, and let it idle.
- If the engine starts, go to step 12.
- If the engine does not start, go to step 11.

11. Check to see if the fuel pump is running: listen to the injector rails underneath the intake manifold cover while an assistant turns the ignition switch ON (II). You should hear the fuel flow through the injector rails for about 2 seconds when the ignition switch is turned ON (II).
- If the pump runs, go to step 12.
- If the pump does not run, test it.

12. Read the pressure gauge. The pressure should be 330 - 382 kPa (3.4 - 3.9 kgf/sq.cm, 48 - 56 psi).
- If the pressure is OK and engine is running, the test is complete. If the engine is not running, repair the cause, then continue this test.
- If the pressure is too high, check for a pinched or clogged fuel return hose or line.
- If the pressure is too low, check for a clogged fuel filter and for leaks in the fuel lines.
- If the pressure is out of spec and the fuel lines are OK, replace the pressure regulator.

13. Remove the pressure gauge, and reinstall the fuel pulsation damper with a new washer. Tighten the fuel pulsation damper to 22 N.m (2.2 kgf.m, 16 lbf.ft).

NOTE: Disassemble and clean the fuel pressure gauge attachment thoroughly after use.

14. Install the intake manifold cover.