I’d love to have a working gas gauge. Any help please!

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  1. Herk

    Herk Member

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    i have a 67 Belvedere. When I got the car the tank was out and there was no fuel sending unit. I installed a new one from summit.
    No gauge though. So we ran a new ground. Still no gauge. Any ideas?
    Thanks!

    95A8A378-C3B8-4E29-A7DE-836BA848334D.jpeg
     
  2. Jerry Hall

    Jerry Hall Well-Known Member

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    Have you tested your gauge?
     
  3. BeepBeepRR

    BeepBeepRR Well-Known Member

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    Ground strap from hard line to hardline at the sender. It jumps the rubber hose. Also like Jerry said.. Have you checked the gas gauge?
    You can test it with a couple aa batteries and a couple leads..

     
    Last edited: Jun 25, 2019
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    • JimCoronette

      JimCoronette Well-Known Member

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      Does the temperature gauge work?
       
    • Badvert65

      Badvert65 Well-Known Member

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      Take the wire that attaches to the sender at the tank. Use a screw or paperclip or something and ground that wire. At the dash, turn on key and gas gauge should peg 'full'. If it does, your wire to gauge, and gauge are fine, the problem is at the sender. When you say you ran a new ground, did you run the ground from the sender itself or just from the tank? As stated above, the senders get their ground via a short metal strap that clips to the sender fuel line and the fuel line on the chassis. Anyway, if grounding the sense wire does not cause the gauge to peg full, then your issue is likely the wire going from the tank forward. They usually go up through the trunk and then forward to the dash, so check the wire in the trunk area first, the rest is trial and error. Also, if none of your gauges work, check fuses first, then check things on the gauge cluster itself, like the dash voltage regulator. Basically, with a properly grounded, new sender you will just need to check everything else. Unfortunately, at 50+/- years old, the usual suspects are everything.
       
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      • Ron H

        Ron H FBBO Gold Member FBBO Gold Member

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        Good question as when I encountered my loss of fuel and temp gauges the circuit board was partly fried (my F-up) so repaired it with a conductive paint from a rear window de-fog repair kit...advice of a fellow member and it worked..
         
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        • Herk

          Herk Member

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          Yep!
           
        • Herk

          Herk Member

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          Awesome, I’ll give that a try. Thanks!
           
        • Herk

          Herk Member

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          Thanks fellas. I’ll check it out and report back later.
           
        • JimCoronette

          JimCoronette Well-Known Member

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          That means your voltage limiter in the dash is working, so you should be getting 5 volts at the gauge.

          As mentioned above, make sure the ground strap at the sending unit is making good contact.
           
        • Alan Fiandaca

          Alan Fiandaca Member

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          When I put a new gas tank in, I looked at the ground strap that jumps the rubber fuel line and figured I could do better. I snipped the strap in half and then pushed on a 14 ga. female wire connector attached to a black 14ga. wire that I grounded to a stainless screw into the body.The idea that the sender needs to ground thru the 50yr. old clips that attach the fuel lines to the body was odd at best. Never had an issue yet with the fuel gauge not working, just sayin.
           
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          • 66383

            66383 FBBO Gold Member FBBO Gold Member

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            Same here.:thumbsup:
             
          • Dennis H

            Dennis H FBBO Gold Member FBBO Gold Member

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            F71BE3EA-B091-4618-A7EC-C52852FD51B9.png I didn’t have a working gauge for 29 years. It was the ground all along. Sure feels good to see this.
             
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            • BeepBeepRR

              BeepBeepRR Well-Known Member

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              Last edited: Jun 25, 2019
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              • Ron H

                Ron H FBBO Gold Member FBBO Gold Member

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                In all my years chasing electrical demons (won't admit how many unless ya gimme a beer) friggin GROUNDING has been the most common culprit! If in doubt ground it out...
                 
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                • miller

                  miller Well-Known Member

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                  Keep in mind, a few things have to work together, reading right, for the gas gauge to work. Besides a good ground...

                  1) The gauge itself needs to work. Test it! On the bench, I use 3 D batteries, that add up to 4.5 volts. (Close enough) Arm moves slow, so give it time to move completely.
                  2) Sending wire in good shape. Check with an ohm meter.
                  3) Sending unit, at and inside the tank, needs correct readings, from full to empty.
                   
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                  • Herk

                    Herk Member

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