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Another Gas Gauge Question

Discussion in 'Early CJ5 and CJ6 Tech' started by cayenne, Oct 28, 2020.

  1. Oct 28, 2020
    cayenne

    cayenne Member

    central Texas
    Joined:
    Dec 24, 2006
    Messages:
    277
    This is all aftermarket stuff...I gave up on the original cluster a long time ago.

    I use a 15 gal MTS tank, an MTS sender and an autometer gas gauge. After lots of hard work, I was so happy when I finally got it working and had a functional gas gauge for about 6 months. It was reading correctly (well...full when the tank was full, and empty when the tank still had about 5 gallons in it).

    Then, out of no where, it now reads 25% when the tank is full.

    The rear tank is an absolute nightmare to remove to access the sender....any ideas on what might cause this? OR some troubleshooting before I drop that tank again?
     
    cayenne, Oct 28, 2020
    #1
  2. Oct 28, 2020
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
    Joined:
    Aug 10, 2003
    Messages:
    23,596
    Divide and conquer. Disconnect the sender from the gauge. Measure the resistance of the sender to ground and see if it's what you would expect for a reading of 25%. Test the gauge with fixed resistors to see if it reads correctly. See this thread on building a tester. You don't need to build the tester, but you can test the gauge with fixed resistors like shown here.
    Build A Gauge Tester

    If the gauge tests ok, you have to assume the problem is with the sender. Sorry.
     
    timgr, Oct 28, 2020
    #2
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