I have a 2003 GMC Envoy and my gas gauge has been flowing up and down to empty and full recently it has stayed on empty. How do I fix it?
Ensure that all of the wire connections are clean, secure and corrosion-free.
2
Check your fuel gauge fuse if
the gauge's indicator stays on empty when your turn on the ignition. If
the fuse is good, join the sending unit connector to ground. Replace the
sending unit if the gauge indictor moves to the full line.
3
Ground the terminal located on
the back of the fuel gauge with a jumper wire if the indicator doesn't
move. If it does move, consider replacing the wire between the fuel
gauge and the sending unit. A poor ground is frequently responsible for
fuel gauge problems.
4
Release the wire that connects
to the fuel tank's sending unit. Confirm that there's no worn insulation
that would permit wire contact to the body or frame. A fuel gauge
reading of full generally indicates a problem with the tank unit, not
the wiring.
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