How to Test for a Faulty Fuel Pump on a Saturn S Series

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Not getting fuel to the engine? Hypothesizing problems with the fuel pump? Test your theory.

Steps

1. 1
   Listen for the fuel pump to run. Turn the key to "on" and listen for a "whirring" noise to occur for two seconds.

   
   
2. 2
   Listen for the relay to switch. The relay is in the inner passenger side fuse box. Turn the key to "on" and listen for a click coming from the relay.
3. 3
   If the relay is not "clicking," try swapping it for the relay that controls the horn (if the horn is working).
4. 4
   Test for voltage to the pump. Peel back the carpeting in the trunk on the driver side paneling behind the wheel well. There is a connector there with three wires: green, black, and grey. Use a multi-meter to probe the hot grey wire and touch a ground. Turn the car to "on" and you should see 12V for 2 seconds.
5. 5
   Test the ground on the pump. Test for continuity between the ground contact on the fuel module and another ground (bare metal) on the car.
6. 6
   If you have voltage to the pump and the ground is good, then you may have a faulty fuel pump.

   
   

Tips

• To access the fuel pump, the fuel tank must be dropped and removed.
• You can try to temporarily get the pump to work by lightly banging on the gas tank.
• The fuel pump will only run for 2 seconds if the engine is off.

Warnings

• Always use caution when dealing with electricity. Especially near flammable materials such as gasoline.

Things You'll Need

• Multi-meter

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