Fuel Pressure: Testing and Inspection

NOTE:
- When reconnecting fuel line, always use new clamps.
- Make sure that clamp screw does not contact adjacent parts.
- Use a torque driver to tighten clamps.
- Do not perform fuel pressure check while fuel pressure regulator control system is operating; otherwise, fuel pressure gauge might indicate incorrect readings.

PROCEDURES
1. Release fuel pressure to zero.
2. Disconnect fuel hose between fuel filter and fuel tube (engine side). Then install pressure gauge.
3. Start engine and check for fuel leakage.

Fuel Pressure Gauge:

4. Read the indication of fuel pressure gauge.




SPECIFICATION AT IDLING

5. Stop engine and disconnect fuel pressure regulator vacuum hose from intake manifold.
6. Plug intake manifold with a rubber cap.
7. Connect variable vacuum source to fuel pressure regulator.

Vacuum/fuel Pressure Test:

8. Start engine and read indication of fuel pressure gauge as vacuum is changed.

NOTE: Fuel pressure should decrease as vacuum increases. If results are unsatisfactory, replace fuel pressure regulator.