Dropping the tank is extreme...and probably not necessary. I doubt rust is an issue, if it was, theres rust regardless if its full or empty. I would however run a cleaner product, and take a look at the filter, the one located along the fuel lines. The tank is fine...
Its to expensive to drop the tank IF YOU DON'T HAVE TO. Before you start the car, listen for the pump, if it sounds like its struggling...then fine..otherwise, leave the tank up.
If any crude got thru, the fuel filter would have picked it up. Those should be changed every once in a while
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