On Jan 16, 1:26*pm, Harryk wrote:
The manual is silent on how much you open the gas valve on the tank. I
opened it all the way and then shut it off when the "test" was finished.

You should always open the valve all the way on an LP tank. They are
designed with a "back-seat", which seals the valve stem when openend.
If you partially open it, gas can leak from the stem.