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Gas gauge being optomistic!

Discussion in 'The Garage' started by southernspeed, Aug 8, 2006.

  1. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    I've searched till my eyes bled (well...nearly:rolleyes: ) and all gauge posts seem to be that they're pegged or won't go over 3/8 or 1/2 tank.
    Well...mine goes way over to the right when I fill it up, then starts going down as normal until it hits about the 3/4 mark and just stays there!


    Any know about this one?:confused:
     
  2. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    ttt anyone?
     
  3. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    Has it been this way as long as you've owned the truck, or did it just start happening some time after you bought the vehicle?

    (Gauges that aren't reasonably accurate bother the hell out of me)
     
  4. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Just happened a few days ago! Been perfect for 10 years!
     
  5. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    Maybe this page from the '85 GM shop manual will help (and maybe it won't). I believe the tester mentioned thereon is a device that simulates the sending unit's 0-90 ohm resistance range.

    fuel_gauge_troubleshooting_chart_1of2.jpg

    fuel_gauge_troubleshooting_chart_2of2.jpg
     
  6. muddybuddy

    muddybuddy 3/4 ton status

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    nope its working properly! after it eats 1/4 tank it turns into a hybrid:wink1:
    thats the secret behind these trucks...shhhh dont tell anyone
     
  7. 1985_K5_Silverado

    1985_K5_Silverado 1/2 ton status

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    You've discovered the secret! My 8mpg is actually 38mpg. The hard part was converting my starter to do double duty as both a starter and a drive motor. Being a full-size, the huge battery bank fits easily behind the back seat.
     
  8. longbedder

    longbedder 1/2 ton status Premium Member

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    Should be between 0-90 ohms, like the gent above said. I fixed mine by making new ground connections from the tanks to the frame, and running new wire to the very back of the guage from the tanks (removing the original wiring and bypassing the printed circuitboard in the dash).
     
  9. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    Wow that's good news!
    Of course.........IF you're wrong, you WILL come and push me home when I run out of gas won't you!:D
    1985_K5_Silverado, thanks for the info.
     
  10. southernspeed

    southernspeed 1/2 ton status GMOTM Winner

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    I've just disco'd the wiring plug by the tank and turned the ignition on expecting the gauge to go to Empty but it climbed right around WAY past Full. Is this right????
     

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