i just did tis 3 weeksago .took it to radiader shop boiled it 3 days cut a 2 in hole in it to drain the crud out 2 32oz cups full .well when i put it back in and filled i with gas the next day i smelled strong fumes and it was leaking around the seam on the bottom so i threw it away and put a 30 gal alanaum tank no more rustproblem