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So I have this cool old frame with a sporty tank welded and molded on. It isn't heavily rusted; but there is some in there and I'd like to take care of it before feeding my freshly rebuilt Panhead from this tank. Any ideas?
 

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If the petcock is aluminium vinegar will eat it if left too long.

Vinegar will totally and safely do the job but provided you can leave it several days. It works very well but quite slowly. Rather than a petcock just bolt a plug onto the tank and leave the vinegar in there longer.
 

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There's a product called 'ospho' which is a blend of phosphoric acid and dichromic acid that will convert the surface rust into iron phosphate. You basically fill the tank, slosh it around, and let it dry. Won't seal any leaks but will prevent further rusting. Should also clean the tank enough to allow welding any pinholes.

You should run a filter anyway regardless of what's in the tank.
 
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