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Old 06-21-2008, 03:49 PM
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Fuel Gauge Problem

Hello there,
I have a 97 GMC Safari AWD. I just had the fuel pump (assembly) replaced about 2 months ago. Not too long ago the fuel gague always reads full. When I slow to a stop, there will be some fluctuation, but it always returns to full. I was told that to check the wiring to the gauge, disconnect the connector and locate the purple wire (goes to the gauge). With the key on and the connector unplugged, the gauge should real full. It does not. It reads empty. Then if I ground the purple wire and turn the key on, the gauge should bottom out empty - and it does.
Any suggestions on what might be the problem with a new pump assembly?

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Old 06-21-2008, 05:22 PM
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gm has had alot of probs with the senders, some times you can buy just the sender but more often than not you will have to replace the assembly, but do check the wiring. the sender wire can be grounded and make the gauge move if this is the case the prob is at the tank....check gnd from tank
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Old 06-21-2008, 05:54 PM
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If someone just had it apart you proabaly have a bad or broken wire, most likely a ground wire. If you follow the wires from the tank there usually is a wire that bolts to the frame rail. Check it to be sure it is clean and tight.

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