> Actually it is quite hard to ignite petrol from a petrol pump with a naked
> flame.
> Besides having a LEL (Lower Explosive Limit) petrol has an Upper Explosive 
> Limit
> (UEL) where above that level the gas/air mixture is too rich to burn. In 
> the
> open air the gas/air mixture goes from too rich to too leen very quickly.

Funny, I always managed to light open containers of petrol *very* easily :-) 
There's no huge explosion or fireball, just a nice steadily burning flame 
from the top.

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