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Thread: Fuel Tank Sealer Botched Job

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  1. #1
    Registered User b25bsaboy's Avatar
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    Fuel Tank Sealer Botched Job

    As some of you know I bought a Yellow 1989 R100RT sight in seen. After replacing just about every seal on the engine and transmission it is now oil tight.
    Only problem that I am now faced with is every so often the left Bing carburetor starts to p*#s out fuel. Talked to a mechanic who has been around since JC came to earth and the first question he asked, what was the condition of the fuel tank internally. My response was it appeared that someone tried to coat the internals with POR-15 fuel tank sealer and botched it very badly. The mechanic explained that very fine particles are getting past the in line fuel filters and are either clogging or hanging up on the float needle, thus causing the fuel to overflow. I know I will have to take apart the carbs and ultra sonically clean and rebuild them for a winter project.
    Now back to the fuel tank. In your collective minds, how can I strip the POR-15 from the internals of the tank. I placed a flat bladed screw driver down the side and it seems to be able to scrape away very easily, which surprised me. My question is what would work to flush out the tank and reapply the POR-15. I have done a number of tanks with no issues, but I think the PO didn't take the proper time in the preparation, as I know it will take 2 - 3 days to complete the job.
    Does anyone have any thoughts?
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 2009 R1200RT

  2. #2
    Rally Rat
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    Tank stripping

    There are a couple of methods that you might consider.
    if you want to save the paint on the tank, then you might want to try this "old timers" trick. Plug the fuek tap holes and fill the tank with white vinegar. You'll have to let it sit for several days, rotating the tank to get all interior surfaces enough time to let the vinegar do it's stuff.
    After a few days, check out the interior and, if it looks good, drain and flush the tank. The vinegar will remove the original liner and, at least soften the POR-15 liner.
    It may take more than one treatment in this manner to get all of the old liner out. Then re-line the tank, and you're good.
    If you're going to re-paint the tasnk anyway, then just take it to a good radiator shop and have then "tank" it. That will remove everything, including the paint. Now you get to start from scratch!
    Boxerbruce

  3. #3
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by 1074 View Post
    There are a couple of methods that you might consider.
    if you want to save the paint on the tank, then you might want to try this "old timers" trick. Plug the fuek tap holes and fill the tank with white vinegar. You'll have to let it sit for several days, rotating the tank to get all interior surfaces enough time to let the vinegar do it's stuff.
    After a few days, check out the interior and, if it looks good, drain and flush the tank. The vinegar will remove the original liner and, at least soften the POR-15 liner.
    It may take more than one treatment in this manner to get all of the old liner out. Then re-line the tank, and you're good.
    If you're going to re-paint the tasnk anyway, then just take it to a good radiator shop and have then "tank" it. That will remove everything, including the paint. Now you get to start from scratch!
    Great Idea, as this is less toxic than using an acid. Thank you. Will get going this weekend and will try to remember to take pictures and report back to this board.
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 2009 R1200RT

  4. #4
    Registered User 88bmwjeff's Avatar
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    Another option is to start looking for a reasonably priced used tank. They're never around when you really need one. So if you start looking now, you might find one.
    Jeff in W.C.
    1988 R100 RT (the other woman)
    "I got my motorcycle jacket but I'm walking all the time." Joe Strummer

  5. #5
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    Call the POR-15 tech line?

  6. #6
    Minnesota Nice! braddog's Avatar
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    Is it POR-15 flaking off, or the original factory lining?

    Is there a lot of junk floating around, and can you see evidence in the carbs themselves?

    You could go to any auto parts store and stick an inline fuel filter in each line to see what you get. Many airhead owners have done this as the original lining starts to deteriorate.

    Also, bear in mind that if some previous owner used POR-15, they probably did it for a reason, whether it was botched or not. Getting all the POR-15 out of there will likely just be the start of fixing your fuel issues.

    Sometimes floats just stick on these old bikes as well. It's why many of us just shut the gas off when we stop.
    -----------------------------------------
    Brad D. - Member #105766
    '77 R100RS - Black Beauty (big pipe, baby!)
    '94 R1100RS - Sylvia

  7. #7
    Registered User b25bsaboy's Avatar
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    Quote Originally Posted by kantuckid View Post
    Call the POR-15 tech line?
    Any idea what the phone # is?
    Rick MacPherson
    Success is Not a Destination, But a Journey.
    Accredited Motorcycle Appraiser
    1968 BSA Starfire, 1976 BMW R75/6, 2009 R1200RT

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