Quote Originally Posted by rusty00 View Post
Weld it up.
If you can get to the crack while the tank is still in place.
Drain fuel 100%, make sure it is all out and purg with exhaust gases or warm nitrogen gas.
Once purged and dry and while being purged you can weld in place.
How do you "purge" with exhaust gas? Where do you get nitrogen gas to purge the tank?