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Apr 26th, 2026 | | AD Chevy Trucks  Over 6,000 pictures Brad Allen has an awesome collection of Chevrolet factory pictures that he has set up from film strips. Check them out!
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| | | | Joined: Aug 2007 Posts: 33 Apprentice | | Apprentice Joined: Aug 2007 Posts: 33 | sorry, forgot to mention I grounded the sending wire unit.....THEN the gauge went back to where I think it should be. Terry1218 | | | | | Joined: Mar 2005 Posts: 1,029 Member | | Member Joined: Mar 2005 Posts: 1,029 | When you ground the input from the sending unit to the gauge with the key on, you will show empty, regardless of the amount of fuel in the tank. | | | | | Joined: Jul 2004 Posts: 5,708 'Bolter | | 'Bolter Joined: Jul 2004 Posts: 5,708 | Terry1218,
Here are some ideas. Without ANY wires going back to the tank, the gauge will read EMPTY when the key is OFF, and will read FULL when the key is ON.
Using the wire from gauge to tank, at the tank, with key ON you should see this. As Baldy stated, ground the wire to a known good clean ground and the gauge will swing to EMPTY.
Same drill, but dangle the wire in space! Gauge should swing to FULL.
If this happens, wire and gauge are good, and your sender or ground integrity is bogus. Don't get confused trying to match the fill level in the tank with a corresponding gauge reading...just prove one of the components, which will put the blame on the other. I think this info is accurate for a negative ground Chevrolet...I don't know if a positive ground system would reverse any of the readings, but I don't think so.
Stuart | | |
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