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Old 05-16-2005, 05:39 PM
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Key Off Fuel Pump Running

Hello..i Have 94 Gmc 3500 And With The Key Off The Fuel Pump Is Still Running . The Weird Thing Is That For Some Reason The Pressure Switch Is Not Shutting It Off.

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Old 05-16-2005, 06:32 PM
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I think you have a pump relay that is stuck in on position.

The oil pressure switch gets its 12+ wire from the computer so it should not be able to power the pump when key is off even if it stuck in closed position too.
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Old 05-16-2005, 07:19 PM
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I HAVE REPLACED THE RELAY AND IT IS STILL RUNNING
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Old 05-16-2005, 08:23 PM
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Try disconnecting the relay see what happens.

Try disconnecting the oil pressure switch see what happens.

Check continuity of oil pressure switch with a test light to see if closes a circuit when truck is started.
Should be an open when theres no oil pressure and close when there is.

Check to see that there is not voltage at all times on pump relay activation wire.

Possible that theres a shorted wire to 12+ somewhere.
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Old 05-16-2005, 09:49 PM
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Thank You........... You Were Right . There Was A Short At The Oil Pressure Sender Wires.
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