Not necessarily so. See: http://en.wikipedia.org/wiki/Flammability_limit#Upper_explosive_limit
On Sat, January 17, 2015 1:33 pm, Patrick Driscoll via KRnet wrote: > The fuel itself will not burn. If a spark occurs in the fuel, nothing > happens. If the spark occurs above the fuel level, the fumes will burn in > an > explosive manner. > Patrick Driscoll
