A few things I'm taking away from this:

1. Don't weld on the truck bed
2. Be careful on how far I fill up the tank
3. If the tank is over full, careful on the angle that the filler neck sees.

Glad to hear it was a minor set back and not a major catastrophe. Thanks for posting this info so the rest of us that hadn't even thought about stuff like this happening can learn from it. I know I haven't even considered the angle of the filler neck and over filling the tank. I suppose I would have learned at some point, but that may have been years down the road!