Fuel Pressure Regulator: Testing and Inspection

FUNCTIONAL CHECK
A "Fuel Pressure Check" is required to test the fuel pressure regulator.

Fuel Pump Fuse Location:

Preparation: Releasing fuel pressure.
Before disconnecting fuel line, release fuel pressure from fuel line to eliminate danger.

1. Remove fuel pump fuse.
2. Start engine.
3. After engine stalls, crank it two or three times to release all fuel pressure.
4. Turn ignition switch off and reconnect fuel pump fuse.

Fuel Pressure Check

CAUTION:
- 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.
- Use Pressure Gauge to check fuel pressure.
- Do not perform fuel pressure check while fuel pressure regulator control system is operating; otherwise, fuel pressure gauge might indicate incorrect readings.


1. After releasing fuel pressure. (Refer to steps listed above.)
2. Disconnect fuel hose between fuel filter and fuel tube (engine side).

Fuel Pressure Check:

3. Install pressure gauge between fuel filter and fuel tube.
4. Start engine and check for fuel leakage.
5. Read the indication of fuel pressure gauge.
At idle:
- When fuel pressure regulator valve vacuum hose is connected.
- Approximately 250.1 kPa (2.55 kglcm2, 36.3 psi)

- When fuel pressure regulator valve vacuum hose is disconnected.
- Approximately 299.1 kPa (3.05 kglcm2, 43.4 psi)

Fuel Pressure Regulator:

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





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

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