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Thread: fuel gauge reading full

  1. May 17th, 2011, 03:36 PM #1
    jkrobbie
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    Default fuel gauge reading full

    Hey folks,

    My fuel gauge reads full, even when I know there's not a drop of fuel in the tank. I figure the problem is probably a shorted wire.
    However, my m715 has been converted to 12v and I'm pretty sure the fuel sending unit and gauge are both 24v. My question is whether I can use the gauge (since I'd like to keep that stock) and just replace the sending unit and fix the wire short.

    Thanks.
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  2. May 17th, 2011, 11:10 PM #2
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    randyscycle
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    If you have a stock gauge and sender and the truck has been converted to 12 volts, then there is part of the problem.

    You will need a 12 volt gauge and sender. The 24 volt original isn't going to work on 12 volts and there are only a few senders that will work with the stock configuration anyway as they read opposite of most sending units of the time. That is, resistance-wise.
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  3. May 19th, 2011, 03:42 PM #3
    jkrobbie
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    Well that stinks. Expected though. Thanks for the input Randy.
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  4. May 19th, 2011, 09:36 PM #4
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    brute4c
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    You can get a sending unit and matching gauge as a set from NAPA...part number: 501-1742

    This link may work for you:
    https://napaonline.com/Catalog/Resul...&Dk=1&Dp=3&N=0

    For my zip code is $42.99...your price may vary...

    This bolts into the stock gas tank...wire it up and go!
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  5. June 3rd, 2011, 11:44 PM #5
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    shepsjeep
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    I was reading through so posts and ran across this one and thought I would respond since I had this issue.

    Be sure and ground your sending unit. I even had the ground wire made and ready to install and forgot to attach it. I had to drop the tank AGAIN to install it. Issue fixed!
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  6. June 4th, 2011, 07:08 AM #6
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    Don Cavey
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    As mentioned above, you have to have a complete circuit for the gauge. If you have no connection or an open connection, the gauge will read full. You might try just running a jumper wire from the tank to the frame (clean metal for good contact of course) and see if your reading changes. Quick and dirty as they say...
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  7. June 16th, 2011, 09:18 PM #7
    rookie
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    Default fuel gauge

    i have a question for u my truck isstock 24 volts and my fuel gauge is also stuck on empty or full when i tap it it moves from empty to full or vice versa help
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  8. June 17th, 2011, 10:12 AM #8
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    Barrman
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    Check the grounds on the dash panel and the tank. Read through the -20 manual and it talks you through some of this troubleshooting.
    Remember if you didn't build it you can't call it yours.

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