The pool version of Muriatic acid (sold in the hardware store) is plenty hot stuff. It will knock down some surface rust initially and then keep right on going into the base metal. Ive experimented with it some and concluded that it's too strong and too hard to control for general rust removal. As soon as you open the lid you see a little acid vapor cloud wafting out of the jug like in a cartoon.
Diluted and controlled it could be useful but probably more on an industrial scale.
If you could knock the loose stuff off with some mechanical means then you could follow up with a phosphoric acid which will react with remaining rust and leave an iron phosphate coating. I haven't tried it myself inside of a fuel tank but have used it numerous time for external paint prep.
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