2004 GMC Envoy fuel guage

2004 GMC ENVOY
73,688 MILES • 6 CYL • 4WD • AUTOMATIC
Avatar
AUTOSTU
  • MEMBER
  • 1 POST
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.
Aug 20, 2010 at 9:02 PM
Advertisement
Avatar
WRENCHTECH
  • CAR REPAIR CONTRIBUTOR
  • 20,761 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.
Aug 20, 2010 at 9:09 PM
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.