no, the propane stoves light when they mix with the air. that's how it works. ive tried to blow up a propane tank, the gas only ignites. if it was flamable by itself, it would burn back into the propane can and explode the can.
True, it would have to leak out in order for it to mix with air and reach it's stoich ratio before being able to ignite. How is that not possible with this set up if it should leak?
