Gas gauge not working

dubldart340 said

You can check the gauge and associated wiring fairly easily by grounding out the signal wire at the tank. This should cause the gage to go to "Full". If this works, then verify the ground to the sending unit/Tank. If that is good, it is probably the sending unit.

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I agree with the previous diagnosis, but I want to clarify the ground circut. I would definietly give the grounding clip a twist while under the tank area. It pretty much acts like a bridge between the sending unit and the hard fuel line on either side of the rubber hose that connects the two. It clips on and is in an easy place to get crapped-up. This is your only source for a ground to the sending unit. It relies on the steel line being securely clipped ( and therefor grounded) to the frame to complete the circut.

It's important that it make's GOOD contact between the two.