"Bruce L. Bergman" wrote:

The Lower Explosive Limit on acetylene is something like 4% in air,
meaning little leaks can have big consequences. The taillight circuit
is enough. If you think there my be a leak, get away from the car and
call in the Fire Dept. to check. Better safe then six feet under.

-- Bruce --

The MSDS indicates a lower flammable limit of 2.5% (upper 82%).

Pete C.