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Fuel Guage acting funny

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by TxK5Blazer, Jul 26, 2003.

  1. TxK5Blazer

    TxK5Blazer 1/2 ton status

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    My fuel guage was reading about 1/4 of a tank low all the time but now it started reading way past full and just pegs out there what might the problem be it is an 82 with the 5" fuel guage?
     
  2. rcpilot

    rcpilot 1/2 ton status

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    Mine did the same.. it's a bad sending unit..
     
  3. RootBreaker

    RootBreaker 3/4 ton status Premium Member

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    ive got duals... it did the same.. 1 at a time until both did it.. but im buyin another truck to fix my problem..>!!!!
     
  4. Dandwg

    Dandwg 1/2 ton status

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    [ QUOTE ]
    but im buyin another truck to fix my problem..>!!!!

    [/ QUOTE ]
    /forums/images/graemlins/rotfl.gif /forums/images/graemlins/rotfl.gif lol
     
  5. NerdBoy

    NerdBoy 1/2 ton status

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    Before you spend the money on a new sending unit (they are quite expensive) I suggest you take a look at the ground connection for the fuel tank. Mine did the same thing, and it turned out that I had a corroded ground strap.
     
  6. mudhog

    mudhog THEGAME Staff Member Super Moderator

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    definitely check the ground wire when they peg past full like that 8 out of 10 times its the ground wire /forums/images/graemlins/shocked.gif /forums/images/graemlins/thumb.gif
     
  7. manyblazers

    manyblazers Registered Member

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    My 87 did the same thing. Turns out the cap that the sending unit goes through in the top of the tank had a crack in it. The whole sending unit would rock back and forth giving bad readings. Touch of weld fixed it. Take if off of the tank first though /forums/images/graemlins/grin.gif
     
  8. wa_jeeper

    wa_jeeper Registered Member

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    I third the ground idea. I had the same problem on mine. I traced the wires all the way from the tank up to the motor and right near the header my ground wire had burnt through. Fixed that and the gauge works great now... only problem is now I know just how quickly that big tank gets emptied... /forums/images/graemlins/crazy.gif /forums/images/graemlins/wink.gif
     

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