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Gas Cap Id? 70 Cj5

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

  1. 70cj5134f

    70cj5134f Member

    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. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    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. Tom_Hartz

    Tom_Hartz Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

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

    70cj5134f Member

    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. FinoCJ

    FinoCJ 1970 CJ5 Staff Member

    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. colojeepguy

    colojeepguy Colorado Springs

    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. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    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. timgr

    timgr We stand on the shoulders of giants. 2022 Sponsor

    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. 70cj5134f

    70cj5134f Member

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

    Twin2 not him 2024 Sponsor 2023 Sponsor 2022 Sponsor

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

    70cj5134f Member

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

    Tom_Hartz Member 2024 Sponsor 2023 Sponsor 2022 Sponsor

    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