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2004 GMC Envoy fuel guage

Tiny
AUTOSTU
  • MEMBER
  • 2004 GMC ENVOY
  • 6 CYL
  • 4WD
  • AUTOMATIC
  • 73,688 MILES
When you go to fill up, the guage goes to empty and the light comes on. After driving for a while, it finally moves to 3/4 or other reading. I have tried a new cap.
Friday, August 20th, 2010 AT 9:02 PM

1 Reply

Tiny
WRENCHTECH
  • MECHANIC
  • 20,757 POSTS
I don't know what you were expecting the gas cap to do for the gauge but your probably looking at a bad sending unit in the tank. You can test the rest of the circuit by unplugging the tank and grounding the signal wire. I think it's purple. Then momentarily turn the key on. If the gauge spikes to full, the rest of the circuit is good.
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Friday, August 20th, 2010 AT 9:09 PM

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