I just did the tank on a Super M. Started with a tank that was sitting exposed for years without a cap. It appeared heavily rusted with big flakes inside on the floor. I got as much dry flakes out as I could to start with. Then rinsed it with water. Put in a gallon of muriatic acid straight. Let it sit on all six inside surfaces for 2-3 hours each. Then fill with water and let sit another couple days. Drain and flush with clean water. Put in an 8 oz bottle of phosphoric acid or metal prep right away. Slosh onto all surfaces. Fill with water and let sit for a couple hours. Drain and let air dry for a couple days before either coating the tank with a sealer or filling with gas.
This process seemed difficult but was very easy. The results were excellent as the inside of my tanks looks like new. It is hard to believe it came out this nice.
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Today's Featured Article - Talk of the Town: Repairin a Gas Tank - by Staff. This interesting discussion is from the Tool Talk Discussion Forum. Remember that safety is your first priority - make sure you know what you are doing before attempting a potentially dangerous activity!
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