Autometer fuel gauge not working

Discussion in 'Electrical Systems' started by dickeymoore, Apr 2, 2021.

  1. dickeymoore

    dickeymoore Member

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    I have a 1974 Z28 that I installed gauges in years ago I leave the battery disconnected because it sit more than I drive it I connected the battery today to let her run and noticed that the fuel gauge is not working now it reads way pass full could this be a fuse or something or is it the gauge itself and I have to take the gaugr cluster out?Thanks
     
  2. SPG

    SPG Bumblebee Builder

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    does it go to empty to full on start up, or does it stay at full even after the car is off
     
  3. dickeymoore

    dickeymoore Member

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    Stays at way pass full even after car is off
     
  4. SPG

    SPG Bumblebee Builder

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    You should be able to test if the gauge is broken or if it's something else if you have a multi meter, instead of explaining everything here is a link you can use to search
    https://handtoolsforfun.com/how-to-test-a-fuel-gauge-with-a-multimeter/
    If you don't have a multimeter it will be hard to know what the exact issue is. Since it stays stuck after it loses power the gauge could be stuck. I would check your electrical connections first though.
     
  5. dickeymoore

    dickeymoore Member

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    Ok so I guess I have to remove the hauge cluster to check the connections
     
  6. Twisted_Metal

    Twisted_Metal Administrator Staff Member Lifetime Gold Member

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    "Gauge past full" indicates an open circuit. (Infinite resistance)
    A fuel gauge is just an Ohm meter measuring resistance in the circuit which is changed by the float connected to the sending unit

    It's usually caused by one of two things:
    1. A bad ground at the fuel tank
    2. A bad connection somewhere between the gauge and the sending unit.​
     
  7. dickeymoore

    dickeymoore Member

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    I checked the ground on the tank nothing changes so I guess I'll remove the gauge cluster and check there
     

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