Re: Repair Ideas..?
I would say remove the tank from the start. The firewall can be welded without it, but if you do mess up and put a hole in the tank its going to be a bitch to fix it in place, and you may have to take it out anyway to repair the tank, after you fix the firewall.
Purging the tank with the exhaust gas will work. So will any inert gas, such as nitrogen, argon, CO2 etc. If you do decide to attempt welding the firewall with the tank in place, purge it before, and while you are welding, in case you have a miscue and blow through the wall of the tank. You wont like the result if you dont.
Good Luck
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