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Thread: 1966 Fuel Tanks??

  1. #1
    Join Date
    Jul 2008
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    Default 1966 Fuel Tanks??

    I just picked a nice set of ‘66 Shovel 3-1/2 gal.split tanks (repaints with L77-’78 emblems). I’m not sure if the left tank is a ’66. I understand the ‘66s are 1-year only with right-side petcock (both 3-1/2 & 5 gal. tanks?). My ’41-’84 parts manual does not list ’66 only tanks though I may not have the correct parts manual. Obviously, the left tank would have the vented cap and the right a non-vented cap for a right-side petcock setup. I am trying to get info and finding correct caps (I like the tall style Eaton caps!)

    My Questions are.
    1) Were the fill bungs reversed for the ’66 only tanks or were they different bungs all together? As compared to the left-side petcock split tanks with right vented cap (61102-36) and left non-vented cap (61103-65)?
    2) If different; does anyone know the cap part numbers? Or do I just order the normal year caps and reverse for the ’66 setup…..

    Thanks,
    William
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    William Edwards, AMCA #10035

    Attend the 2018 Southern National Meet at Denton Farmpark, NC, 18-19 May 2018
    http://www.amcasouthernnationalmeet.com/

  2. #2
    Join Date
    Jun 2013
    Posts
    9

    Default

    Since the left tank has no petcock, it would appear to be a 66 as well.
    Regardless of which side the petcock is on, the left cap should be non-vented. This way, when the tanks are full and the bike is on the side stand, the fuel doesn't transfer and run out on the ground from the resulting lower elevation of the left cap. An issue anyone with 64 and older tanks is far too familiar with as they use vented caps on both sides.
    In your pictures, the fillers and vent hose crossover connections, all seem correct for 66.
    Happy Motoring

  3. #3
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    Makes since Hercumile, thanks
    William Edwards, AMCA #10035

    Attend the 2018 Southern National Meet at Denton Farmpark, NC, 18-19 May 2018
    http://www.amcasouthernnationalmeet.com/

  4. #4
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    Aug 2004
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    Default

    You cannot reverse the caps, the neck depth and tangs on caps are specific to the side they fit.
    Robbie Knight Amca #2736

  5. #5
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    Thanks Robbie, I understood the bung/cap fitment relationship. I just wondered if the MOCO switched bungs for the ’66 only tanks plus I got wrapped up in flow from left to right tank. After Hercumile’ response, it dawned on me (assumed) that the left tank (non-vented) will burp air through the cross-over from the right tank.
    William Edwards, AMCA #10035

    Attend the 2018 Southern National Meet at Denton Farmpark, NC, 18-19 May 2018
    http://www.amcasouthernnationalmeet.com/

  6. #6

    Default

    IMG_0804.jpgBoth tanks appear to be correct 66. What Robbie said is correct, Non-vented on the left, simple reason, if the tanks are full of fuel the left if it was vented would leak fuel through the vent hole when the bike is on the side stand. The original caps are quite different in construction, left suits a deeper neck. The MOCO made them fool proof.
    Don't forget that there are an upper and lower hose connecting the tanks together, so no burping required!
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    Last edited by Wazza.w; 12-24-2017 at 09:57 AM. Reason: Add photo

  7. #7
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    Your '85 parts book shows the parts they were selling that year, not was used in 1966. You have to be year specific when using a parts book for reference. For instance if you use a 1966 parts book for reference for a 1965 you're going to have problems.
    Be sure to visit;
    http://www.vintageamericanmotorcycles.com/main.php
    Be sure to register at the site so you can see large images.
    Also be sure to visit http://www.caimag.com/forum/

  8. #8

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    Quote Originally Posted by Chris Haynes View Post
    Your '85 parts book shows the parts they were selling that year, not was used in 1966. You have to be year specific when using a parts book for reference. For instance if you use a 1966 parts book for reference for a 1965 you're going to have problems.
    There is a small problem in what you have stated, The parts book which I have covers 1965 to 1969, so last year for the Panhead (65), then onto to the Generator Shovelhead, It then notes the years that the particular part was used, some of the parts go way back in years.

    Mine is a re-print of an original HD manual and has become a well used reference as the "exploded drawings" are extremely handy.

  9. #9

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    I'm with Chris as far as restoration info.If you want what will work on a runner the later book will work but correct restoration info for earlier years is not always correct

  10. #10
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    The closest published parts book is '68. "66 and '67 only were supplements to the '65 book and aren't illustrated.
    Robbie Knight Amca #2736

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