Fuel gauge pegs full - Chevelle Tech
Electrical & Wiring Troubleshooting electrical problems.

 
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post #1 of 8 (permalink) Old Feb 27th, 11, 8:34 PM Thread Starter
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Fuel gauge pegs full

I have read several posts on the fuel gauge issue. However, I am a bit confused as to where to start the troubleshooting. The reason for my confusion is that I tested the sending unit in a friends car prior to installing in my tank. On my friend's Chevelle, the sending unit operates very well with the fuel gauge. On my car the fuel gauge pegged past full as soon as we turned the key the first time. Should I start with the fuel gauge, or could this be a bad ground? The ground wire is connected to the body, on the support that runs under the trunk. We sanded the spot where the wire is grounded prior to installing. Appreciate the help.

MikeSS

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post #2 of 8 (permalink) Old Feb 27th, 11, 9:08 PM
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Re: Fuel gauge pegs full

what does it do if you disconnect the wire?

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post #3 of 8 (permalink) Old Feb 28th, 11, 8:58 PM Thread Starter
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Re: Fuel gauge pegs full

Okay, I disconnected the tan wire and pushed a bare wire into the female end of the tan wire. Attempted to find a good ground and at no point did the needle change. My wife was sitting in the car watching the gauge and thinks she saw the needle flicker slightly. Could have been a fluke though.

I am wondering if to ensure a good ground if I can run a wire from the tan wire to the negative terminal on the battery or the screw that grounds the battery to the fender. Would that be okay to find a good ground?

What should be my next step in troubleshooting should I not get the gauge to move?

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post #4 of 8 (permalink) Old Mar 1st, 11, 11:41 AM
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Re: Fuel gauge pegs full

When 'she' was sitting in the car, was the key ON?

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post #5 of 8 (permalink) Old Mar 1st, 11, 6:04 PM Thread Starter
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Re: Fuel gauge pegs full

Quote:
Originally Posted by d1_bradley View Post
When 'she' was sitting in the car, was the key ON?
Ummmm.......

Of course, I turned it to the on position!

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post #6 of 8 (permalink) Old Mar 1st, 11, 8:28 PM
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Re: Fuel gauge pegs full

I put a new Sender in the tank and put 5 Gals gas in it, gauge read dead E. Thought there was a problem. Opened the tank filler and with a flashlight took a stiff piece of wire and "lifted" the float with it and the gauge read 1/3, so I guess it's o.k.
I unhooked the sender wire inside the trunk (key on) and the gauge went past full (fyi).

Try running a wire all the way up to a good batt ground from sender ground.


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post #7 of 8 (permalink) Old Mar 1st, 11, 9:38 PM Thread Starter
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Problem SOLVED!!!!!!

Tried many different things, even tried a buddies know working sending unit plugged in outside of the tank with no luck. After connecting to the negative on the battery and having no change we started looking at the gauge. All well.

Moved to the wiring. From the harness under the dash everything was fine. Needle went to E when grounded to tan wire. Looked at the connection in the trunk.........

At some point the wire had been swapped to a different spot in the harness. When I bought the new harness did not pay attention to the fact that the connectors were not lined up in the right spot.

Problem SOLVED!!!!!!!

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post #8 of 8 (permalink) Old Mar 1st, 11, 11:20 PM
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Re: Fuel gauge pegs full

Thanks for update.........

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