68 fuel gauge - Impala Tech
Troubleshooting Diagnosing problems

 
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post #1 of 7 (permalink) Old 08-24-2011, 04:38 PM Thread Starter
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68 fuel gauge

I'm hoping you guys can help me diagnose a problem with the gas gauge on my 68 custom. I just bought it recently and the gauge doesnt appear to work. it reads way past full, as though its pointing at 3 o'clock. I read a post from someone else and Big Dave suggested grounding the tank to the neg battery to see if its a ground issue. I did that and still no movement. It just stays stuck in that position no matter how much gas is in the tank. Any suggestions? It's quite nerve racking to drive around with absolutely no idea how much is in the tank. thanks in advance!
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post #2 of 7 (permalink) Old 08-24-2011, 05:09 PM
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If you unplug the gauge from the tank it should read full. Ground out that wire and it should read empty (or vise versa, not sure). Anyway if the gauge dosen't move you have issues other than the tank's sending unit. Ther gauge may be physically broken or you have an issue with the circuit.

Big Dave
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post #3 of 7 (permalink) Old 08-24-2011, 09:49 PM Thread Starter
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Thanks Dave! what do you mean unplug the gauge from the tank?
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post #4 of 7 (permalink) Old 08-25-2011, 06:38 AM
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There is an electrical connection where the sender plugs into the chassis wire harness. Unplug it and test the voltage there.

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post #5 of 7 (permalink) Old 08-25-2011, 02:48 PM Thread Starter
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Thanks again and sorry to be a pain but could you please point me in the right direction as to where the plug is located? Also, should i test the voltage coming from the tank? any idea what it should be? Sorry but my chilton manual hasnt arrived yet.
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post #6 of 7 (permalink) Old 09-12-2011, 07:14 PM Thread Starter
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so i crawled under there (tight fit without ramps) and could only see a ground wire. where is the wire i should be unplugging?
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post #7 of 7 (permalink) Old 09-12-2011, 07:16 PM
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In the trunk. A single wire that goes through the trunck floor usually back by the tag. That is the "hot" wire that is attempting to go to ground by way of the gas tank sending unit.

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