In article , Dave Baker says...

One traditional method is to pipe car exhaust fumes into the tank to flush out
anything combustible and to displace all the air so there's no oxygen. Exhaust
gas, having been burnt once is pretty much inert so any remaining petrol vapour
won't ignite anyway. You need to keep the exhaust running while you weld of
course.

Have you ever personally done this, Dave?

Jim


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