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Will This Rear Fuel Tank Fit My 66cj?

Discussion in 'Early CJ5 and CJ6 Tech' started by Buildflycrash, May 22, 2018.

  1. May 22, 2018
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

    Gulf Breeze FL...
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    For sale locally and I’m down to almost bare frame so probably the best time to do it.

    Tank from 78CJ

    Photo not working from my phone. :susp:
     
  2. May 22, 2018
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    Here it is...

    [​IMG]
     
  3. May 23, 2018
    sterlclan

    sterlclan Member 2022 Sponsor

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    Measure the width of the tank but it should I used a yj tank in the boys 70.
     
  4. May 23, 2018
    Warloch

    Warloch Did you say Flattie??? Staff Member

    Falcon, CO
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    When you fit it - a word of caution as I have split out a stock style rear tank due to the pumkin flexing up into it an creasing a seam in the mid front. I have since moved to building my own tanks out of 1/8" steel.
     
    fhoehle likes this.
  5. May 23, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    A tank from a '78 should fit. Check Boyink's web page about installing a tank like this in his CJ-6. You can find it with the Wayback if it's no longer on the web.
     
  6. May 23, 2018
    Daryl

    Daryl Sponsor

    Bonney Lake, WA
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    In simple terms, No. Can it be made to fit by cutting away all the bracing in the back of the frame, trimming the bumper and crossmember, yes.
     
    47v6 likes this.
  7. May 23, 2018
    47v6

    47v6 junk wrecker! 2023 Sponsor 2022 Sponsor

    USA
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    I built my frame and made my rear tank fit. I guess it was from a 76 or something. 15 gallon. The biggest issue I has was the possibility of the axle housing hitting the tank. There isn't a lot of clearance. If you still have the bracing and tow hitch, as Daryl has stated, it will need to come out. Yo albs need to think about filler houses and inlets. I am very happy to not have the underseat tank, but only because it allows a lower seat height. I also like the extra 5 gallons.
     
  8. May 23, 2018
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    Thanks for the replies. I was aware that I would need to remove the bracing and cut a hole for the filler neck. The fit between the cross members was my biggest concern. Now also concerned that the pumpkin will hit. I did a YJ spring conversion and that is supposed to have more flex. The 2.5" lift springs may counteract that. I'm just not comfortable sitting on that stock location tank. :shock:
     
  9. May 23, 2018
    Daryl

    Daryl Sponsor

    Bonney Lake, WA
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    People been sitting on those tanks for almost 80 years. Arguably much safer then underneath in a rear end type collision. Only real downside is a gas shower in a rollover but let's try to keep them shiny side up.
     
    fhoehle, Buildflycrash and 47v6 like this.
  10. May 23, 2018
    EchoWars

    EchoWars Banned

    Kansas City
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    Back when I had my '69 CJ, I rolled it twice: once in the snow (3' deep and only casualty was a slightly bent soft top support) and once when I got t-boned at an intersection. Never leaked a drop of fuel either time. Engine oil, OTOH...
     
  11. May 24, 2018
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    What’s Wayback? I remember that build but didn’t find it.
     
  12. May 24, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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  13. May 25, 2018
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    Do folks typically run the stock fuel pump (Dauntless) with a rear tank or install electric pump? Where about along the system would be best to install an electric pump?
     
  14. May 25, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    All the intermediates and nearly all lates were carbureted, using a conventional mechanical pump. The rear tank is no worse for the mechanical pump than the under-seat tank. If I wanted to run an electric pump, and keep the under seat tank as well as add the rear tank, I would put the switch in the floor between the driver's feet and the pump in the left-hand frame rail, as far back close to the under-seat tank as possible. I'd keep the pump away from the exhaust heat. If I were running just the rear tank, I'd put it in the frame rail just forward of the rear frame kick-up. It's best to mount the pump low and as far to the rear as possible.
     
    Last edited: May 25, 2018
  15. May 25, 2018
    Buildflycrash

    Buildflycrash More or Less in Line. 2024 Sponsor 2022 Sponsor

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    Thanks Tim
    Thanks also for the countless helpful post I see from you every day. Your input, knowledge and research makes ECJ5 an fantastic place for all of us. :bow:
     
  16. May 25, 2018
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    I am running the OEM style mechanical v6 pump (and OEM 2g carb) with a dual tank set-up (underseat and rear). Works great from either tank - no problems.
     
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  17. May 25, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

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    Glad I could help. (y)
     
  18. May 25, 2018
    Keys5a

    Keys5a Sponsor

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    Electric fuel pumps always perform best when they push fuel rather than pulling it. As close as reasonable to the tank, the better.
    Mechanical pumps create a vacuum, so can pull fuel with no issues.
    -Donny
     
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  19. May 25, 2018
    colojeepguy

    colojeepguy Colorado Springs

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    X2 same set up on mine
     
  20. May 28, 2018
    Buildflycrash

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    I’m not at all sure what these nipples are for (smog) but I think I read something about connecting them to delete. This OK?

    [​IMG]
     
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