[right way right]

I have shot little propane bottles before with .44 mag and they did not light, I am pretty sure there had to be some kind of flame present.

[right way right]

Has to be flame to blow I meant.

[cymbeline]

“I have shot little propane bottles before with .44 mag and they did not light”

Here’s a piece of trivia.

Your car’s gasoline tank has gas on the bottom and air on top. The top part is a mixture of gas and air. That mixture will not ignite. A hydrocarbon-air mixture has a range within which it will ignite. Less than some percent or greater than some percent and it won’t ignite.

In your tank the mixture is out of the ‘ignitable’ range.