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Fuel gauge freakout

Discussion in '1973-1991 K5 Blazer | Truck | Suburban' started by CK5, Sep 18, 2000.

  1. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    After I dropped the tank and installed a new fuel pump, the fuel gauge when on empty will jump all over the place, from empty to full like it is possessed, even worse when going around corners, but so far seems OK when the tank is 1/4 full or above, any ideas on why this is happening?

    [​IMG]
    5,000 Pounds of American Rolling Steel
     
  2. riz

    riz 3/4 ton status

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    I have just come to the conclusion that Blazer fuel gauges belong in the same category as bigfoot, the lock ness monster and yetti..........They are all unexplainable phenomenon !

    <font color=purple>L8r,

    .Riz.<font color=purple>
     
  3. Mudzer

    Mudzer 1/2 ton status Author

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    Sounds like you don't have it grounded properly. Check the ground first...

    Neil

    Mudzer 1978/91 K5
    <font color=blue>www.mudzer.coloradoK5.com</font color=blue>
     
  4. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    The ground was the first thing I checked, but I will check it again.

    Thanks

    [​IMG]
    5,000 Pounds of American Rolling Steel
     
  5. Brian 89KBlazer

    Brian 89KBlazer 1/2 ton status

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    Steve
    I'd concur with mudzer. My ground wire rusted off twice leaving my Blazer dead on the spot after burrying the needle 1/2 way around the gauge past full! It got freaky like yours just before it died!

    Good Luck
    Brian
    89KBlazer
     
  6. **b**

    **b** 1/2 ton status

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    Another thing to check on is the baffle in the tank ....
    They come loose sometimes and end up wiping out the sender...
     
  7. CK5

    CK5 In my underwear Administrator Premium Member GMOTM Winner Author

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    That's what I am afraid of, if it's the baffel it is going to stay that way for awhile.

    [​IMG]
    5,000 Pounds of American Rolling Steel
     
  8. BIGJ

    BIGJ 1/2 ton status Author

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    Yep, my money's on the baffle. The previous owner of my blazer went through three different sending units trying to solve the mysterious guage problem. After I got it, the fuel gauge went crazy around a 1/4 tank then stopped working completely a few weeks later. A new tank fixed the problem, and was a lot cheaper than those three sending units.


    BIGJ
     
  9. Eric78K5

    Eric78K5 1/2 ton status

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    Steve,
    If you've checked the ground already, then my money is on the baffel too. Also, after I checked the ground in mine, I traced the wire back to where it joins the rest of the wires at the starter...found a spot where it had worn bare, and was grounding out there also. I did a temp fix, cause I plan on replacing the whole harness with one of those 18 circuit deals from painless.

    Eric78K5
    K5-Because Size Matters!
     
  10. S10-4x4

    S10-4x4 1/2 ton status

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    I hate to sound crazy but the fuel guage wires goto the starter?!?!?! If so that might explain why my fuel guage works rather funny and my starter seems to smoke and not work!!!!
    Laters


    SK-15

    J**P...Its what's for dinner

    http://s10-4x4.coloradok5.com
     
  11. DBLAZER

    DBLAZER 1/2 ton status

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    Hey Steve, mine does the same thing. I just got used to it.[​IMG]

    [​IMG]
     

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