[BB_TX]

Propane is heavier than air and will settle to lower surfaces in still air. But it would not take much of a breeze to stir that gas up enough to move upward.

Shutting off a tank would lead you to think it had to be in the outside plumbing as the inside pipes should retain normal pressure. And a leak should be more apparent at higher pressure than low.

Only leak I ever had was the little red regulator valve. And spraying it with soapy water did not show any bubbles. But finding no other leak source, and reading about others with that valve leaking, I took mine off and found residue around the very small vent hole underneath that valve where I could not get enough soapy liquid on to bubble. Replaced it and no more odor. Don't remember any odor inside though.