Testing Electric Fuel Pump

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Testing Electric Fuel Pump

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Testing Electric Fuel Pump - 1/25/2006 5:07:25 PM

nj85z28

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Joined: 1/24/2005
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Testing Electric Fuel Pump

(Taken from Chilton Manual 28282)

Multi-Port Fuel Injection
1. Relieve the fuel system pressure and check that there is an adequate quantity of fuel in the tank.

2. Connect a fuel pressure gauge to the purssure connector fitting located on the end of the fuel rail.

3. Make sure the ignition switch has been OFF for at least 10 seconds and that all accessories are OFF.

4. Turn the ignition switch ON and the pump will run for about 2 seconds. Note the system pressure with the pump running should be between 40-47psi.

**The ignition switch may have to be cycled to the ON postition more than once to obtain maximum pressure. It is also normal for the pressure to drop slightly when the pump first stops, but it should then hold steady**

5. If the pressure is not as specified, verify that fuel pump operation is heard in tank.

6. If fuel pump operation is not heard, inspect the fuel pump relay and wiring.

7. If fuel pump operation is heard, inpect the filter and lines for restriction.

8. Start the engine and make sure the pressure decreases about 3-10 psi at idle.

9. If fuel pressure does not decrease, inspect fuel pressure regulator and hose.

10. Disconnect the fuel pressure gauge.

Throttle Body Injection/Crossfire Fuel Injection

1. Turn Engine OFF and relieve fuel pressure (disconnect negative battery cable and loosen fuel cap)

2. Remove air cleaner and plug the THERMAC vacuum port on TBI

3. Install a fuel pressure gauge between the throttle body unit and the fuel line. Use a back-up wrench to hold fuel nut on the TBI when removing the fuel line.

4. Start the car and observe the fuel pressure reading. It should be 9-13 psi

5. Relieve fuel pressure

6. Remove the fuel pressure gauge

7. Reinstall the fuel line

8. Start the car and check for fuel leaks

9. Remove plug covering THERMAC vacuum port on the TBI and install the air cleaner

< Message edited by nj85z28 -- 1/25/2006 5:34:01 PM >

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