Fuel Pressure: Testing and Inspection

1. Relieve fuel system pressure.

Checking Fuel Pressure:

2. Using an extra piece of injector hose, connect fuel pressure gauge as shown.

Fuel Pump Test Connector:

3. Energize fuel pump by bridging terminals of yellow fuel pump test connector (located near the air flow sensor and turning ignition "ON"
4. Pinch off hose between gauge and pulsation damper with a clamp.
5. Observe fuel pressure on gauge (this will be the maximum fuel pump pressure).

64 - 85 psi (441 - 589 kPa)

^ If pressure is higher than maximum specified, replace fuel pump. If pressure is lower than minimum specified, check fuel filter. If filter is OK, replace pump.

6. Disconnect jumper wire from test connector and turn ignition "OFF". Wait 5 minutes, then observe residual pressure on gauge.

Minimum 50 psi (343 kPa)

^ If residual pressure is less than specified, fuel pump pressure relief valve is leaking - replace pump.

7. Remove pinch clamp from hose between gauge and pulsation damper.
8. Start engine and let idle.
9. Observe fuel pressure on gauge (system operating pressure).

30 - 37 psi (206 - 255 kPa)

^ If pressure is higher than maximum specified, check fuel return line for kinks or restriction.

^ If pressure is lower than minimum specified, check fuel filter. If filter and return line are OK and pressure is still not within the specified range, replace pressure regulator.

10. Disconnect vacuum hose from fuel pressure regulator with engine idling. Fuel pressure should increase when vacuum hose is removed.

38 - 46 psi (265 - 314 kPa)

^ If not, replace pressure regulator.

11. Shut engine "OFF" and wait 5 minutes. Observe residual pressure on gauge.

Minimum 21 psi (147 kPa)

^ If not, check for leaking fuel injectors. If injectors are not leaking, replace pressure regulator.

^ If all test results are OK, fuel pump and pressure regulator are OK.