Fuel gauge and temp gauge issues - Team Camaro Tech
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post #1 of 10 (permalink) Old Sep 24th, 14, 05:09 PM Thread Starter
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Fuel gauge and temp gauge issues

On my '68 console car I am having issues with these two I have had it to two shops and wiring Continuity was checked ,( supposed to be ok, they told me the gauges were bad so I got new gauges and started on the fuel gauge. soon as the key is turned on it pegs up past full and will not lower without manually pulling the needle down with a finger. I changed the gauge and the same thing happens I thought i Had it then as soon as I mounted it in the cluster BAM pegged again. I have followed the directions from the other fuel gauge post and disconnected the lead in the trunk and grounded it ... still pegs out. getting frustrated as a stupid question ,the hot lead and the sending unit lead are supposed to go on the 3 and 9 o'clock terminals correct? and a body ground to the 6 o'clock terminal?


Now for the temp gauge, there are 4 terminals and a ceramic plate. the terminals at 9,12,and 3 are silver and the 6 o'clock terminal is goldish with a resister going to it. how is this supposed to be wire? The reason I ask is I had a american wiring loom installed and I am not sure if it was hooked up correctly. Which terminals do the Hot and lead to the temp sending unit hook up to?
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post #2 of 10 (permalink) Old Sep 24th, 14, 06:00 PM
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Re: Fuel gauge and temp gauge issues

Steve - Past full means more than likely bad ground of the sender int he tank. The ground is hard to see but it is at the rear passenger tank strap. Run a temp ground with a alligator test lead to bare metal. If that works, your golden.

If it doesn't Read the sticky in this forum for full troubleshooting and diagnostics of fuel gauge issues. https://www.camaros.net/forums/showthread.php?t=195833 and post your Ohm's test results here in your post.


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post #3 of 10 (permalink) Old Sep 24th, 14, 06:13 PM Thread Starter
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Re: Fuel gauge and temp gauge issues

I followed this I . results are in post but I just went out and hooked the hot wire to the gauge. and bypassed the wire going back to the tank by hooking direct ground to othe terminal, If i read the sticky correctly this should show empty... NOT still pegs out on full
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post #4 of 10 (permalink) Old Sep 24th, 14, 06:22 PM
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Re: Fuel gauge and temp gauge issues

Might just need to slap the gauge to loosen the needle.
Reverse the jumper leads on the gauge and see if the gauge goes to zero/empty.
If so then the OE hook up is wrong or gauge is wired wrong internally.
If gauge stays full , then bad gauge.

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post #5 of 10 (permalink) Old Sep 24th, 14, 06:30 PM
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Re: Fuel gauge and temp gauge issues

The fuel gauge and the temperature gauge are just volt meters. They both measure the voltage to ground.

If you have a bad ground (for example; in the case of the temperature sender it could have been screwed into a painted hole which insulates the sending unit from a good ground). In the case of the gas gauge 90% of time it is corrosion that prevents the ground. Just taking the parts apart and reattaching everything allows the sending units to ground again most of the time. People think that replacing a part fixed the problem but it was just the removal of some of the corrosion that really did it.

Continuity will not provide enough information as to having a good ground; it assures you have a complete circuit, but it doesn't determine the resistance value. For that you use the Ohm setting on the multi-meter. Too much resistance and the 12 volts from the fuse box will never reach ground. That is why you use a 25 foot long 10 gauge wire with a large alligator clip on one end for the negative battery terminal, and a small alligator clip on the other to attach it to whatever you want a good ground to be. I have fixed more electrical problems with that one reel of wire than any other electrical diagnostic tool in my tool box.

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post #6 of 10 (permalink) Old Sep 24th, 14, 06:45 PM Thread Starter
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Re: Fuel gauge and temp gauge issues

If I run straight hot wire and straight ground to gauge what should it read? empty?
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post #7 of 10 (permalink) Old Sep 24th, 14, 06:46 PM Thread Starter
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Re: Fuel gauge and temp gauge issues

the pos and neg wires in the temp gauge were backwards would this burn it out or keep it from working?
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post #8 of 10 (permalink) Old Sep 24th, 14, 07:30 PM
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Re: Fuel gauge and temp gauge issues

Steve i dont see your ohm readings so I assume you dint take any readings from the sender. If you ground the sender wire it will read zero ohms which is empty.


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post #9 of 10 (permalink) Old Sep 25th, 14, 10:09 AM Thread Starter
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Re: Fuel gauge and temp gauge issues

I switched the pos and ground on the gauge and then grounded the lead in the trunk and it read empty. the needle is rising a lot slower omn the gauge now so I am headed the right way. next is to remove the temp sender and remove the liquid teflon I put on it to seal and see where that goes.
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post #10 of 10 (permalink) Old Sep 25th, 14, 03:03 PM
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Re: Fuel gauge and temp gauge issues

Sounds like you are on the right track on both situations.


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