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Gas Cap Id? 70 Cj5

Discussion in 'Early CJ5 and CJ6 Tech' started by 70cj5134f, Sep 10, 2018.

  1. Sep 10, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Aug 18, 2018
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    749
    Having trouble finding correct fuel cap?
    Ordered one from napa , wrong.
    I'd order online if I knew what fit?
    I'd like the 3 insh one in chrome or stainless?
    It's the correct tank for. A 70, but I think the fill tube has been replaced?
    Measurements are.
    Inside hole 1-1/2in.
    Inside notches 1-3/4in.
    OD of neck is just shy of 2-1/8 in.
    Neck sticks out of tub 7/8in, it should clear any style.
    Help?
    Don't want a locking cap.
    15365987311651411929963.jpg 15365987891891802574528.jpg
     
    70cj5134f, Sep 10, 2018
    #1
  2. Sep 10, 2018
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
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    That looks like a rear tank - was it an oem rear tank or a swap in (they started with rear tanks sometime in later 70 production)?
     
    FinoCJ, Sep 10, 2018
    #2
  3. Sep 10, 2018
    Tom_Hartz

    Tom_Hartz Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    North Carolina
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    I have some Stant numbers in stainless. I will post them tonight .
     
    Tom_Hartz, Sep 10, 2018
    #3
  4. Sep 10, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Its oem tank to my knowledge?
    When placing gas nozzle in neck it feels funny, like it's going uphill slightly
    Before going down?
    Anyway it don't leak, just need a better looking cap?
    1536612081363497731750.jpg 15366121453032047315578.jpg
     
    70cj5134f, Sep 10, 2018
    #4
  5. Sep 10, 2018
    FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    Bozeman, MT
    Joined:
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    I believe that when searching for aftermarket parts - that vintage is often considered part of the 72-75 intermediate grouping even though it was oem for late 70-71 as well. I retrofitted one of these into my 70, and i got my cap from Walcks (for 72-75). Take note, in 72 the tanks were vented with charcoal canister I believe, so I had to remove a portion of the cap on the underside to allow it to vent through the cap.

    This is what Walcks has now - it looks a little different (and better) than the one I ordered a few years ago as it looks to have the open vent through the cap. Bet this would work.
    Gas Cap Rear Mount Tank 1970-75 CJ5, CJ6
     
    FinoCJ, Sep 10, 2018
    #5
  6. Sep 10, 2018
    colojeepguy

    colojeepguy Colorado Springs

    At the foot of...
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    Apr 4, 2010
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    7,171
    Napa's website shows a Balkamp 7031059, and it looks like it would work. Is that the one you got?
     
    colojeepguy, Sep 10, 2018
    #6
  7. Sep 10, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    Aftermarket gets the year ranges wrong on Jeep parts all the time. I don't have a book for '70 or '71, but the '72 Jeeps all got vapor recovery with an expansion tank under the left rear fender. With vapor recovery, you get a non-vented filler cap. If you pick the '72-73 application for your cap, it may not be correct for a vented cap system. A non-vented cap used on a vehicle without vapor recovery can lead to vacuum above the fuel in the tank, and stalling due to loss of fuel delivery. It would be simple to add a tank vent to the nipples at the corners of the tank if needed. Access may be a problem.
     
    timgr, Sep 10, 2018
    #7
  8. Sep 10, 2018
    timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    Medford Mass USA
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    My '74 book shows 994739 for a sealed cap. There is also a cap for export cars which I presume is vented, 991661 (makes sense since this is an earlier number).
     
    timgr, Sep 10, 2018
    #8
  9. Sep 11, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Don't remember which I got,sent it back.
    991661 I think I'll order. Bout 8$
     
    70cj5134f, Sep 11, 2018
    #9
  10. Sep 11, 2018
    Twin2

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

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    can't give you a part number . not stamped on cap
    this is on my 71
    CAM00636.jpg
     
    Twin2, Sep 11, 2018
    #10
  11. Sep 11, 2018
    70cj5134f

    70cj5134f Member

    East Tn
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    Looks like u need a new one?
    Just send me the old? LOL
     
    70cj5134f, Sep 11, 2018
    #11
    Twin2 likes this.
  12. Sep 12, 2018
    Tom_Hartz

    Tom_Hartz Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    North Carolina
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    For my rear tank (looks like it will work for you) I use a Stant 10623 and my front tank under the seat a Stant 10625. The both are non locking stainless steel.
     
    Tom_Hartz, Sep 12, 2018
    #12
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