Fuel gauge problem - Team Camaro Tech
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post #1 of 7 (permalink) Old Jul 16th, 11, 11:51 AM Thread Starter
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Giorgio
 
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Fuel gauge problem

On my 1968 Camaro the fuel gauge works always proper , yesterday morning the gauge shows 0 but the tank is nearly full.

I had never problems , what could cause this problem .Need some trouble shooting help!
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post #2 of 7 (permalink) Old Jul 16th, 11, 04:29 PM
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Re: Fuel gauge problem

Check the black ground wire in front of the tank on the pass side. Might need to loosen and retighten to get a good connection.
Pull ground off, turn ign on, gauge should go to full.

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post #3 of 7 (permalink) Old Jul 17th, 11, 03:07 AM Thread Starter
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Re: Fuel gauge problem

Hey Everett,

thanks for your help .

I removed the center console and removed ground from the fuel gauge and switched on ignition , the indicator moves to full.
Than I connect ground again and as the indicator moves to low I switched off the ignition ,the indicator stands still and when I switched the ignition on ,the indicator moves to fully low.
So it seems the fuel gauge instrument is ok, right?

I searched the ground wire on the passender side but i didn't find any. Do I have to remove the fuel Tank to see the ground wire?
Is the ground wire normally connected to the lip around the tank or on the top?
The only wires I found ( with fingers touching) were the sending unit wires.
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post #4 of 7 (permalink) Old Jul 17th, 11, 06:40 AM
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Re: Fuel gauge problem

Giorgio - here is a troubleshooter for fuel gauge issues that helps eliminate and isolate failure points. https://www.camaros.net/forums/showpo...91&postcount=2 You will need a simple multimeter (available at HF or Radio Shack or Sears) to read the Ohm's the fuel tank sender is putting out.

Sounds like your fuel gauge is in fact working - capable of reading a sender signal, so most likely the fuel tank sender ground or the wiring harness from the gauge to the trunk is at fault for your wrong gauge level.

The sender may be electrically "ok" as in capable of sending the right Ohm's signal (zero is empty, 90 ohm's is full), but mechanically the float may have failed and had dropped to the bottom of the tank and is sending zero ohms to the gauge. In a 69 you can see the float and the sender through the tank filler with a good flashlight. 68 maybe a bit harder to see since the filler neck is higher in the trunk.

Brian


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post #5 of 7 (permalink) Old Jul 18th, 11, 01:05 AM
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Re: Fuel gauge problem

sounds like sending unit is bad--full tank too
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post #6 of 7 (permalink) Old Jul 18th, 11, 04:23 AM
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Re: Fuel gauge problem

the ground wire mounts tot he tank strap in the neighborhood of the fuel line as it passes along the tank. on a lift you can see the ground wire connection and tighten it there.


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post #7 of 7 (permalink) Old Jul 18th, 11, 03:17 PM
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Re: Fuel gauge problem

I believe the fuel sending unit ground location is actually at the trunk pan reinforcement for the fuel tank - at least it is on my 67, which I believe to be the same. see attached picture of ground location (rt / passangers side of car)

Last edited by 67 RS Ragtop; Sep 17th, 11 at 11:30 AM.
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