Kurt Krueger wrote:
Glenn Ashmore wrote:

"Empty" is a lot more dangerous that full. Gasoline vapors can remain
in a good enough concentration to explode for a long time. The sure
way to purge the tank is to fill it with water to overflowing and then
drain it. Any remaining traces of gas will float on top and overflow
first. If you can't purge and drain it completely that way open the
inspection port and drop in some absorbent pads for a couple of days.
Retrieve the pads and blow air over it for a couple of days to vent
the remaining vapors. (use a spark proof fan.)


How about throwing in some dry ice to displace the vapors?

That would have the additional benefit of also removing the oxygen from
the tank.

bob