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Old 04-18-2007, 09:36 PM
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old gas tanks

what is the best, easiest, cheapest , way to dissolve the black tar stuff in the bottom of this gas tank (' 49 F-5 COE ). The tank was behind the seat and has hardley any rust...................thanks

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Old 04-18-2007, 11:05 PM
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If you type 'gas tank cleaning" into the search engine (at the top of the page) three pages of threads come up with info. Here is a link to just one of those threads:

Help cleaning Sludge in gas tank
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Old 04-19-2007, 08:08 AM
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well, thanks again ''Brew''. I dd do the search before, but must have worded it different . anuway thanks again.......
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Old 04-19-2007, 10:26 AM
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next question :

one of the popular choices is muractic acid, which I am familiar with and have used before..New question : can I use OSPHO ( phosphoric acid ) in it after ,to seal it or will it NOT work in gasoline ?
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Old 04-22-2007, 01:07 PM
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You can always take it to a radiator shop and have them boil it out. I did that with mine, then sealed it with Bill Hirsch tank sealer.
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Old 04-23-2007, 11:14 PM
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Muriatic acid...commonly found in the swimming pool supply section of most home centers.
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Old 04-26-2007, 02:17 AM
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Doc here,

Try a bunch of Pea gravel about the size of a dime. fill the bottom of the tank with it and "Rock" (no pun intended) the tank side to side with "heart"

This should "sand " the bottom clean after a time, then remove the gravel, and wash out with thinner, it should come out shiny clean If your up to a little elbow grease.

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Old 04-26-2007, 06:45 AM
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Gas will soften the tar on the tank,but gas is getting expencive to. You can brush on the gas and let it soak in,than scrap off with puddy knife.
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Old 04-26-2007, 08:45 AM
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thanks guys, it always helps to get more suggestions. and / or ideas......
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