On Jul 11, 3:57*pm, Ignoramus24437 ignoramus24...@NOSPAM.
24437.invalid wrote:
I have a 22 gallon (or so) fuel tank that originally had gasoline in
it.

I want to use it for diesel.

I would like to drill it and install a through-hull fitting, which
would be for the fuel return line. Ideally, I would like to braze the
fitting in place also.

My question is how do I drill it and braze, so that it would not
explode.

The tank has not had gasoline in it for a couple of weeks.

Today, I recently set it up with the fuel cap open, turned it over so
that the fuel fill hole pionts down, and set it out so that it would
becmoe quite hot under the sun.

Would it be correct to assume that after a few days I could purge it
with compressed air, and then drill and braze it, without exploding?

Would purging with argon be a good idea?

i

Steam clean, if possible. Just a little vapor can cause a lot of
trouble. Old-timers would work on one if it was filled with water
first. Inert gas is a good idea, but how can you tell if it's full
enough? With water, there's no doubt.

Stan