It just takes care. If you can, you wash out the tank. Regardless, you
purge it with air for many hours to guarantee it is dry. You fill the tank
with inert gas such as argon, then weld. Same process if you weld tanks of
unknown condition or which had unknown contents. Welders do it all the
time.

Brian


--
http://www.advantagecomposites.com/tongass -- My 22' Tolman Skiff project
http://www.advantagecomposites.com/catalog -- Discounted System Three
Resins products



"Dave W" wrote in message
...
Most welders will not weld any tank that has ever held gasoline. Could be
a
big clue here!
"terry" wrote in message
...
washing and letting it vent will probably not work.

BE SURE TO INFORM SERVICE PERSONAL OF THE FORMER PRESENCE OF GASOLINE.
Otherwise you may face a costly lawsuit for wrongful death.

Only way to weld it is to leave it filled with water which will displace
any
air needed to create an explosion.