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brand new 12v sending unit and gauge

Discussion in 'Flat Fender Tech' started by evanjm, Aug 17, 2008.

  1. Aug 17, 2008
    evanjm

    evanjm Yeah, it's got an F-head.

    Leesburg, VA
    Joined:
    Sep 13, 2006
    Messages:
    408
    so i installed my new 12v sending unit and fuel gauge and it seems to only partially work. most of the time it jumps to full or it will jump around a lot. anyone heard of this before? are these (i believe Crown makes them) gauges junk? i know mine isn't grounding out or anything.

    maybe there's a certain direction the sending unit has to go in? or am I looking too deep into a junky product?

    thanks,
    evan
     
    evanjm, Aug 17, 2008
    #1
  2. Aug 18, 2008
    PostaljeepSS

    PostaljeepSS Member

    Boise,ID
    Joined:
    Jun 22, 2008
    Messages:
    86
    I don't have a fuel guage in mine but my buddies cj3 does and the guage jumps around like crazy when the fuel sloshes around. If it just sits still on flat ground it reads fine. Does yours jump around when sitting still?
     
    PostaljeepSS, Aug 18, 2008
    #2
  3. Aug 18, 2008
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    You have a meter? Check the resistance reading for the sender. It should change smoothly from full to empty.

    You also need to check your grounds (intermittent operation should always suggest a grounding problem. The grounds go through the body and frame, and that's especially troublesome on old vehicles). I presume the gauge has never worked? I would test the ground from the sender/tank to the body first.
     
    timgr, Aug 18, 2008
    #3
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