Hi i have a 68 camaro convertable and i am having a problem with my fuel gauge. I have a battery disconnect connected to the positive battery terminal and my fuel gauge is reading way over full at about 3 o'clock.
What can be causing this?
Even disconnecting the cut off doesnt return it to its normal reading.
any ideas.

Thanks
Ted

 

I would start by checking the ohm reading from the sending unit in the tank. Is the gauge in the dash or console? If it is in the dash look at the printed circut board, If it's in the console check the ground wire. If that all checks ok then it's your gauge. Good luck.

 

If your gauge isn't returning to empty with no power to it, the gauge is the problem. To test the circuit with the battery connected (and with a good gas gauge), remove the gauge wire at the sending unit (should be a tan wire), the gauge should peg past full. And if you ground that wire out, the needle should go all the way down to empty.

 

Camaro 69,

I did a boo boo when I got my fuel cell and hooked the sending unit wires up backwards... Ok, you don't know how bad I hate to admit that...

Anyway, my guage is also at 3 o'clock, even when the battery is disconnected and even the sending unit...

Soo.... I'm going to assume I've messed up my guage... great. Is there anyway to test my sending unit to see if I messed that up too?

Thanks.

 

I take it you don't really have a full tank?
Troubleshoot Fuel Gauge

 

No, actually it's dry as a bone...

Thanks for the link! I'll check it out now.

 

another question about the fuel gauge on my 68 there is a tan 18 gauge wire appx. coming from the sending unit going up into the harness from the trunk area to the front.
i checked the wiring diagrams and see that this wire goes to a block and then i dont see how it gets to the fuel gauge. can anybody let me know if it changes colors or where does it go from the terminal block. i changed my fuel gauge to a working one but it stills goes up to 3 oclock. !!!!!!!

 

Sorry I can't help you with the color of the wire going to the fuel gauge, but something I read elsewhere awhile back somewhere said that issues with the instrument gauges, including the fuel gauge can be attributed to no ground from the instrument cluster to the body of the car. When I popped out my instrument cluster I found the ground just dangling. Something to look at anyway.

 

where is the ground that goes to the body of the car to the cluster, I should say were in the cluster does a ground wire goes to the body of the car? i just see the harness that goes to the cluster. is that ground in the that harness or is it a separate grown wire? im working on it now and cant find that ground. i think thats my problem to my fuel gauge

 

Hope this helps

How to fix your dash lights - step by step - Team Camaro Tech