cj gas tank

does any one have a good one sitting around, i took out my 22 poly tank because the sending unit from the factory was wrong, and when its turned the "correct way" the internal half is shoved in the corner.. so now im trying to fix my tank that has been sitting in corpus crusty for the last year... so yeah rust. got the holes patched but not sure if the internal lining can be fixed correctly.. i shook it up with gas and some bolts and gonna use some ospho to stop the rust in there. so if it doesnt work im gonna need a tank by sat. .... or any cheap suggestions on how to get it cleaned