Quote:
Originally Posted by midgetracer
Has anyone had good luck cleaning old gas varnish from a model A tank. I have a 29 gas tank to clean that sat 30 tears with about 5 gallons of skanky gas in it. The bottom and sides are covered with a dark sticky varnish that keeps stopping the gas flow. I would like to clean it once and remove all traces of this old gas.
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This varnish does more than stop the gas flow! If you try to run the engine without getting rid if this gunk, it will dissolve in the new gas and leave a sticky residue on the exhaust valve stems. This is often why an engine that sat for many years runs great right after being resurrected, but gradually gets worse. So clean the fuel tank first (and not with H.L.'s $1.50 box of oatmeal)!