I have welded up a number of gas tanks by filling them with water. I have also seen it done by sticking a hose from a CO2 tank into the filler and turning it on filling the gas tank with CO2.


David Fritzsche
1990 Ex-Cab V-6,5-speed, with a few mods
04.5 CTD Dodge 2500 Ram--Tow Rig
Roseville, CA

"Serenity through Sobriety"