Fuel Pressure
WARNING: This page is about a different variant/trim than selected.
WARNING:
Inspect fuel system for leaks or damage before testing fuel pump.
NOTE:
EEC-V PCM has 104-pin connector.
- Release fuel pressure. Install fuel pressure gauge. Turn ignition on and read fuel pressure. Start engine and read fuel pressure. Compare fuel pressure reading on fuel pressure gauge with specification. For fuel pressure specifications, see FUEL PRESSURE SPECIFICATIONS article.
- If fuel pressure is not within specifications, check fuel pressure regulator. With engine running, connect hand vacuum pump and apply vacuum to regulator.
- Ensure fuel pressure changes as vacuum at regulator is increased and decreased. If no pressure change occurs, replace regulator and recheck system. For additional testing information, go to CIRCUIT TEST HC in appropriate article:
- For gasoline vehicles, see TESTS W/CODES - 5.4L GASOLINE .
- For CNG vehicles, see TESTS W/CODES - 5.4L CNG .