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Interior gas tank problem. #590329 03/15/15 5:19 pm
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Gary Scallen Offline OP
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I have a 1969 BSA TB gas tank that must have been coated with some type of plastic compound on the inside. It is deteriorating,flaking, peeling probably from the ethanol in modern gasoline. Is there a solution that will dissolve the interior crud. It does not appear that it leaks so I will just leave the bare steel or coat it with whatever is recommended. Thanks for any input. Gary[b][/b]

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Re: Interior gas tank problem. [Re: Gary Scallen] #590332 03/15/15 5:28 pm
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kommando Offline
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Try acetone, unless you know the exact coating you may need to try a few different chemicals.

Re: Interior gas tank problem. [Re: Gary Scallen] #590333 03/15/15 5:36 pm
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Gary E Offline
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Good suggestion from kommando, as Acetone doesn't like much of anything.


1967 BSA Wasp
1967 BSA Hornet (West Coast Model)
1967 BSA Hornet (East Coast Model)
1968 BSA Firebird Scrambler
1968 BSA Spitfire Mark IV
Re: Interior gas tank problem. [Re: Gary Scallen] #590412 03/16/15 10:38 am
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KC in S.B. Online Content
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".... tank does not leak...." Maybe that stuff is working now. Why would someone bother unless maybe for flakey rust?
It seems Odd to me how much trouble tanks have become in this Hobby !
FWIW,.... I have found that a good way to plug the tank neck opening, is to use the rubber expandable plugs. The ones I use are sold at the local independent Auto Parts store, as a repair for leaking engine block core plugs. (hurry, those stores are disappearing fast!) I Will look at mine and tell you what size (1 5/8"?), but just measure the hole, and be sure to get one that goes in easy when not tightened with the bolt. AND,... also from experience, when the time comes to tighten/loosen the bolt, the plug may simply spin. I have found that drilling a couple of holes in the top washer will allow you to hold it better with a needle nose pliers. Once installed the plug will be sealed enough to allow the tank to be inverted so the top area gets treated.
Now, the petcock opennings are not so easy to plug IMO. So I just use old junk petcocks.

Last edited by KC in S.B.; 03/16/15 10:41 am.

Down to 1 BSA, 2 Triumphs, 1 '56 Chevy
1 '65 XLCH, Hernia Gift, on the way to Japan!
Re: Interior gas tank problem. [Re: Gary Scallen] #590495 03/16/15 10:27 pm
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Mark Z Offline
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KC, good tip on the expansion plug; I think I'll pick one up. I think you can also find them in general hardware/plumbing supplies. (BTW, using one to replace a freeze plug is a temporary fix at best - I found that out the hard way.)



Mark Z

'65(lower)/'66(upper, wheels, front end, controls)/'67(seat, exhaust, fuel tank, headlamp)/'70(frame) A65 Bitsa.
Re: Interior gas tank problem. [Re: Gary Scallen] #590501 03/16/15 11:16 pm
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KC in S.B. Online Content
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Yep, my old brain was correct. 1 5/8' Dia plugs worked good for me.
And,FWIW, I did use those things in my old '86 El Camino until sold last year. The ones under the trans flex plate were a real pain,........ oh yeah, under the LH front PS pump,........ and the .......... anyhow, they lasted quite well. ;-)

[Linked Image]


Down to 1 BSA, 2 Triumphs, 1 '56 Chevy
1 '65 XLCH, Hernia Gift, on the way to Japan!
Re: Interior gas tank problem. [Re: Gary Scallen] #590569 03/17/15 3:39 pm
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Gary Scallen Offline OP
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Thanks for all the good advice guys!

Re: Interior gas tank problem. [Re: Gary Scallen] #590585 03/17/15 5:40 pm
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tri650cc Offline
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if acetone doesn't cut it use 1 gallon of paint stripper , leave it in for about a day rotate tank in all directions about every hour.

Re: Interior gas tank problem. [Re: Gary Scallen] #590611 03/17/15 9:05 pm
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Gary E Offline
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The big plug would work great to keep Acetone from spilling out during the multiple sloshes when cleaning the tank in prep for sealer, so good exterior paint wouldn't get damaged.

Since a lot of the tanks filler necks extend into the tank below the level of the tank itself, I wouldn't think the sealer could come out that way while sloshing. At least for the fiberglass tanks it's that way. So, have to drain the sealer out thru the petcock holes. For those, I use rubber bottle stoppers.


1967 BSA Wasp
1967 BSA Hornet (West Coast Model)
1967 BSA Hornet (East Coast Model)
1968 BSA Firebird Scrambler
1968 BSA Spitfire Mark IV
Re: Interior gas tank problem. [Re: Gary Scallen] #590629 03/17/15 11:52 pm
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KC in S.B. Online Content
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ONE THINK TO BE CAREFUL OF !!
Should have mentioned this FIRST. When a tank is sealed up, like with those plugs, and you shake it, it will gereate PRESSURE. The danger is when you first loosen any of the plugs, there can be pressure spray. Be aware off this possibility, and cover the plug or petcock as you loosen it. Not all solvents do it, but some do.


Down to 1 BSA, 2 Triumphs, 1 '56 Chevy
1 '65 XLCH, Hernia Gift, on the way to Japan!
Re: Interior gas tank problem. [Re: Gary Scallen] #590833 03/19/15 5:31 pm
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Gary Scallen Offline OP
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got it! Thanks again.


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