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rear gas tank problem

Discussion in 'Early CJ5 and CJ6 Tech' started by bkd, May 7, 2008.

  1. May 7, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    Got everything ready to mount the rear tank I got for the 6. I pulled the sending unit I purchased out of the box (70-86 cj) but the hole in the tank is about 3 1/16" across and the sending unit is only about 2 1/2" across......any ideas on how I might make this work?
    [​IMG]
    [​IMG]
    Thanks, Jim S.
     
  2. May 7, 2008
    sdcj6

    sdcj6 Sponsor

    San Diego
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    The tank looks like it uses a lock ring to hold the sending unit on. Just make an adaptor plate that has your bolt pattern in it with the outer diameter for the tank hole, use lock ring to secure to tank.
     
  3. May 7, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    I was thinking along those lines...the lock ring that came w/ my sending unit is to small for the hole as well. I can make an adapter plate and screw it in place w/ a rubber gasket, then drill holes in the SU housing and screw it in place w/ a gasket as well.....what do you think?
    how close to the bottom of the tank is the pick up suppose to be?
    Thanks, Jim S.
     
  4. May 7, 2008
    Dick Harding

    Dick Harding Member

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    Just completed this conversion and looking at your tank it looks like a 76 and up tank as the 70-75 tank has the 2 1/4' filler. Also if it was the 70-75 it would have the 2 1/2" sending unit as I just went down and measured mine. Sounds like you have the 76 and up tank with the sending unit for the 70-75. I wouldn't modify, I would get the right sending unit as they are not that expensive.
     
  5. May 7, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    Ok thanks I'll look again. I ordered from 4Wparts hardware and they just showed one unit for 70-86 cj
    Jim S.
     
  6. May 7, 2008
    jpflat2a

    jpflat2a what's that noise?

    Riverside CA
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    that's not correct
    shame on them
     
  7. May 8, 2008
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    I'd think you could get that part from your FLAPS - try searching at RockAuto or NapaOnline. If it's listed there, it should be available through conventional channels.
     
  8. May 8, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    thanks Tim....I searched their sites and the pics that come up for up to an 86 are the same as the unit I have. I guess I may need to conclude the tank I have isn't what I think it is (in terms of year/make)....I'm gonna research a bit more but it sounds like modifying the part may be in order
    Thanks, Jim S.
     
  9. May 8, 2008
    spud

    spud Nope..it's not finished!

    Augusta Co. Virginia
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    Modifying anything on a fuel tank is a disaster waiting to happen. Why would you not reorder the correct unit that fits the tank properly. Guys here are always complaining about something the "Previous owner" has done to their rig and how it was so easy to do it right. Please don't let impatience cause you a world of headaches down the road.;)

    PS. I meant this constructively, not flaming you........just concerned.
     
  10. May 8, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    I agree with you in principle :)....the problem I have is I think I have a Wrangler tank, in that case the sender won't work in my application....havn't cut or welded yet however :D
    Jim S.
     
  11. May 8, 2008
    Don X

    Don X The Prodigal Moderator Staff Member 2021 Sponsor 2020 Sponsor

    San Diego,...
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    If that's the case it might be time to CL the Wrangler tank and find the right tank to fit the sending unit
     
  12. May 8, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    You know me Don...I'll make this work, if I fab it it'll be fabbed correctly...even a future owner would be proud:)....I was just hoping that I could find a easier way
    Jim S.
     
  13. May 8, 2008
    Boyink

    Boyink Super Moderator Staff Member

    Ava, MO
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    It does look to be setup differently than mine:

    [​IMG]

    Am I seeing it right - it has a driver's side fill?
     
  14. May 8, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    yep Mike it is driver side fill. I'm thinking I can make this work w/o changing the tank....I'll just use a filler piece as sdcj6 suggested, if it doesn't work I guess I can change out the tank at that point. "keeping fingers crossed" :)
    Jim S.
     
  15. May 8, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    here's what I came up with...it's galvanized 1/16", I notched it to fit. I'll use cork gasket under it, turn in place, and should be good to go. I'll put the sender in using cork gasket as well, three screws to hold in place. I think this is going to work out well'
    [​IMG]
    Thanks for all the input guys :beer:
    Jim S.
     
  16. May 8, 2008
    double R

    double R Member

    Reseda, CA
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    jim,

    you get things done, man!
     
  17. May 8, 2008
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor 2021 Sponsor 2020 Sponsor

    Medford Mass USA
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    Mmm. Pardon if this is obvious, but what's wrong with using the Wrangler sender? Different ohm levels? In-tank fuel pump?
     
  18. May 8, 2008
    bkd

    bkd Moderator Supreme Staff Member

    K-Town Tenn.
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    yep both those things....and they're about $150 R)
    Jim S.
     
  19. May 9, 2008
    spud

    spud Nope..it's not finished!

    Augusta Co. Virginia
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    I retract my previous statement, nice job Jim. :)
     
  20. May 9, 2008
    lynn

    lynn Time machine / Early CJ5 HR Rep Staff Member

    Huntingdon PA
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    If you want to use a sealant, use polysulfide. It's rubbery like RTV but designed for use in fuel tanks, impervious to fuels. We use it on the cork gaskets on the Bradley fuel tanks.

    HTH!
     
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