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7. You can weld a gas tank..just fill it with water. NOT!
Water does not work too well because you can still have a
few droplets of gasoline inside, and in any case the inner tank surface will
have a gasoline film that persists.
I have flame welded or brazed gas tanks lots of
times. I use the official US Army procedure to do it safely.
After draining the tank and blowing it dry, connect the
inlet of the tank to the exhaust pipe of a running vehicle. The vehicle
must be running at normal temperature - do not connect anything until the
exhaust is hot. A diesel is best but a gasoline engine is OK, too, if the
engine is running properly. Let the hot exhaust gases waft thru the tank
for a suitable period of time. The warm, oxygen depleted gases help
evaporate any gasoline left inside.
After a good purge, you are good to go.
Don't try this at home if you are in any way unsure about
your skills or this technique.
John
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