reweld my sump!!

[shitbox00]

i have a factory fox mustang tank that has a sump welded on it. the guy i bought it from swore it was tested and didnt leak a drop. BULLSHIT!! well it pisses gas everywhere so what will it cost to get rewelded?? the tank had gas in it so it will need to get boiled out or whatever the **** you guys do. any ideas?? any advice would help. thanks.

[Kurt70s]

Welding on gas tanks isn't really that tough. I always remove the sending unit, drain the gas completely out, then I put the tank on the tailpipe of a running vehicle for a half an hour. This must act like a purge or something, because when you put your nose to the tank, it doesn't smell the least bit like fuel. At this point I begin to weld on the tank. I would also say that a nitrogen purge through the tank would help, but I've never done that, so I don't believe it would be absolutely necessary.