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Fuel gauge reading full all the time

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  • Fuel gauge reading full all the time

    My fuel gauge is full at all times, I have apprx. 1/4 tank of gas. I replaced the sending unit as suspecting this as the problem. I have read through several threads on this site and performed all the troubleshooting tips to no avail. My grounds are good my gauge is functioning, I ohm check the new sender and ohms check fine. I ran a temporary sender wire frome gauge to sender with no change. I have 12 volts on I terminal and 8 volts from S to Grnd. Does this sound correct. Any information would be helpful.
    Thanks


  • #2
    Re: Fuel gauge reading full all the time

    Does it read full with the key OFF as well? If it does, the gauge is stuck and must be replaced. If not, it is probably shorted internally as the tests you indicate appear normal.

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    • #3
      Re: Fuel gauge reading full all the time

      Originally posted by Silvertip View Post
      Does it read full with the key OFF as well? If it does, the gauge is stuck and must be replaced. If not, it is probably shorted internally as the tests you indicate appear normal.
      With the key off the gauge reads empty, I was thinking the sender itself was possibly shorted internally. Checking the sender unit out of the tank with the key switch on I can see movement on the gauge well above the full mark, never going below full though.

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      • #4
        Re: Fuel gauge reading full all the time

        Did you try reversing the wires?
        Grady White 226
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        • #5
          Re: Fuel gauge reading full all the time

          In your original post you said you checked the sender resistance and it is fine. So an internal short in the sender is not a possiblity IF you actually measured the resistance and it is 30 240 ohms as you swing the arm. If not, you have a bad sender. If a sender works outside the tank but not when installed, it usually means the float is hanging up on something in the tank. So you need to be sure the sender is good or not.

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          • #6
            Re: Fuel gauge reading full all the time

            Kpete856, if you find a resolution to your gauge reading problem, let me know please, sir. I have an identical issue. I put in a new sender, ohms readings across the sender are within manufacturer's specifications range. Before inserting the float are, it seemed to travel freely. It's hard to imagine that the float travel is obstructed inside the tank.

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            • #7
              Re: Fuel gauge reading full all the time

              What happens if you disconnect the sender wire from the "S" terminal on the gauge?

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              • #8
                Re: Fuel gauge reading full all the time

                Originally posted by 02 Silverado View Post
                Kpete856, if you find a resolution to your gauge reading problem, let me know please, sir. I have an identical issue. I put in a new sender, ohms readings across the sender are within manufacturer's specifications range. Before inserting the float are, it seemed to travel freely. It's hard to imagine that the float travel is obstructed inside the tank.
                Please post your issue under it's own thread, hijacking another thread only adds to the confusion.
                1985 Baretta Vanguard 16ft & 1984 Evinrude 75hp O/B

                ****Running your motor without water is like peeing into the wind, it's a stupid impulse that is going to be a mess later****

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