I think it is more the fuel can he was using.It's and old metal can,which I think must have had rust going through it.As it was only on the exhaust side which was buggered.He brought his mower around and it had done the exact same thing.I don't usually lend things out,but seeing as he was family I did.I have this saying when people want to borrow stuff.Yes I will lend you my _______ but I come with it at $55 an hour.