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Under Seat Tank Sending Unit Wiring

Discussion in 'Early CJ5 and CJ6 Tech' started by MP67CJ5, Jun 18, 2020.

  1. Jun 18, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
    Joined:
    Aug 20, 2019
    Messages:
    8
    Hi all, I just rewired the new dash in the 67 CJ5 V6. I now need to run the fuel tank sending wire to the fuel gauge. Should I be running the wire along the inside of the tub and up behind the dash or is the correct routing down through and underneath the tub along the frame and up through the back of the firewall? I attached a pic of the dash for your viewing pleasure!

    ECD0EA45-794A-4C98-BDAF-10D357E41668.jpeg
     
  2. Jun 19, 2020
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member 2020 Sponsor

    Denver, CO
    Joined:
    Jul 18, 2013
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    3,255
    Underseat tank? If so, no need for the wire to leave the cab. From sending unit to side of tub and along under the door lip and up behind the dash.
     
  3. Jun 19, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
    Joined:
    Aug 20, 2019
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    Great, thanks for the quick response.
     
    FinoCJ likes this.
  4. Jun 19, 2020
    maurywhurt

    maurywhurt Member 2020 Sponsor 2019 Sponsor

    Western North...
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    Dec 12, 2009
    Messages:
    591
    MP67CJ5, you may also want to run another wire attached to the bolt circle of the sending unit along the same route, and ground it somewhere behind the dash. As I learned from this forum, the lack of a good ground to the sending unit / gas tank will cause the fuel gauge not to work properly, but this simple solution solves that problem.
     
    Last edited: Jun 19, 2020
  5. Jun 19, 2020
    Keys5a

    Keys5a Sponsor

    Florida Keys
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    Jan 23, 2014
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    2,815
    To add to Fino's response, yes the wire runs in a loom up under the door body edge and curves up about 3"-4" at the forward vertical post where the reinforcement is. Some of the reinforcement channels have a hole for the wire/loom to run through on its way to up behind the dashboard. There may still be bent tabs under the door opening edge used to hold the loom up in the recess.
    -Donny
     
    FinoCJ, Rick Whitson and Twin2 like this.
  6. Jun 21, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
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    Aug 20, 2019
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    Thanks for all the great info. Super helpful.
     
  7. Sep 14, 2020
    Henri Watson

    Henri Watson Member

    Mississippi
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    Oct 27, 2018
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    84
    I'm about to do this same thing as well. Just wanted to have a quick sanity check here as there's no evidence of a wire ever having been installed on my old tank/dash: the wire(s) attach to the center bolt on the top of the sending unit, correct?
     
  8. Sep 16, 2020
    MP67CJ5

    MP67CJ5 New Member

    Orange County, CA
    Joined:
    Aug 20, 2019
    Messages:
    8
    Correct. The sending unit wire goes from the center screw on the sending unit to the fuel gauge, and then ideally you would run a dedicated ground wire. The ground can go from one of the 6 mounting screws on the sending unit to the bolt that holds the tank strap to the tub.
     
  9. Sep 16, 2020
    Henri Watson

    Henri Watson Member

    Mississippi
    Joined:
    Oct 27, 2018
    Messages:
    84
    That makes sense, thanks!
     

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