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For what it is worth, I used a product like this several years back. My tank was all rusted inside and used this product - needed 3 fills and rinses not just one - but the inside of my tank is like new. I did not seal it afterwards, I just keep it full of gas and it fine.
http://www.orisonmarketing.com/evapo-rust.html. I did this whole process without removing the tank. Filled through top, drained through gas on/off valve inside the cab. (tubing, buckets and a few rags :-) )