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Help with fuel gauge issue...

Discussion in 'The Garage' started by guitarman, Jun 30, 2006.

  1. guitarman

    guitarman Newbie

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    Hello Blazer Gurus!! I've been lurking here for the past few weeks and am thoroughly impressed with the knowledge available at this site. My fuel gauge is pegged all the way to the right even when no fuel is in the tank and i read on the site that this is a ground problem with the line from the sending unit. I traced the wire to the break and realize i need to replace it from the tank to midway up the frame. My question is how does the wire connect to the sending unit - is there a connector at the tank or does the wire connect directly to then sending unit necessitating removal of the tank? Thanks for any help. Take care.
     
  2. dremu

    dremu Officious Thread Derailer Premium Member

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    The wire was soldered to a tab on the sending unit, at the factory, IIRC.

    Because even my big 100W gun wouldn't heat it well and I refuse to use a propane torch near a gas tank, I ended up drilling a small hole in the tab and using a crimp connector to ground to it, seemed to work okay.

    -- A
     
  3. sweetk30

    sweetk30 professional hooker Premium Member

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    i took bare wire and small hose clamp to one line on sender. worked great for cheep fix.
     
  4. ryan22re

    ryan22re 1/2 ton status

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    The baffle came loose in my tank and knocked the sending unit off of the return lines. Pegged the gauge. That was two months after I dropped the tank to correct the ground wire.
     
  5. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Yes, your sending wire is grounded making the gauge peg to the full side. IIRC the wire does have a plug so simply unplug the wire and make a new one with the correct termination so you can plug it back onto the sender then do a good solder connection to the remaining wire and use heat shrink tubing when you're done.
     
  6. guitarman

    guitarman Newbie

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    Thanks everyone!!!

    Thank you for your help everyone - doing the repair today.
     
  7. readymix

    readymix 3/4 ton status

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    Actually an OPEN in the circut will cause the gauge to read "FULL" and a short will cause the gauge to read "EMPTY
     
  8. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Well that's funny because every truck and car for that matter on a GM vehicle if you pull the wire and ground it the gauge would read full not empty.
     
  9. readymix

    readymix 3/4 ton status

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    maybey on the newer ones. But I guarentee that if you go unplug your sender the gauge will read over full on the CBS and OBS Chevys, and if you short the wire to ground it will read empty.
     
  10. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    0 to 90 ohm senders read full when you ground the sending wire..
     
  11. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Thank you, i knew someone would chime in eventually with the required info as to the correct answer. :thumb:
     
  12. readymix

    readymix 3/4 ton status

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    I always though that.

    0 Ohms = Empty
    90 Ohms = Full

    I'll research it a little more and post up what I find....
     
  13. 4X4HIGH

    4X4HIGH 1 ton status Premium Member GMOTM Winner

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    Make it easy, go pull your sender wire and ground it and watch the gauge peg full. :D
     
  14. readymix

    readymix 3/4 ton status

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    No battery in the truck...

    When I was stationed in great Lakes I had an Open in the Fuel Sender windings. This caused the gauge to read more than full. When I shorted the sender wires together it moved the gauge to empty.
     
  15. ryoken

    ryoken Puppy Fabricator Premium Member GMOTM Winner

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    it was probably a 240 to 33....
     
  16. readymix

    readymix 3/4 ton status

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    0 - 90 is what I replaced it with. Works fine now.

    I thought the 240's were Ford specific...
     
  17. sweetk30

    sweetk30 professional hooker Premium Member

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    gm is 0-90 ohms. ford is the odd ball one.

    any time i found over full it was open wire.
     

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