Re: Firewall welding
If you don't want to remove the tank, one solution to is to drain the tank, fill it with water to the top, pass a charcoal lighter over the fill hole and burn off the fuel vapor. When you refill the tank, any water left in the tank will be at the bottom and can be drained into a container until its all gone. Have personally welded a motorcycle gas tank outlet with water in the tank.
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