And then within a narrow range of mixture ratios. But even then there 
could be a big boom I suppose. The variable resistance fuel level 
sending units are used by the zillions, but it doesn't seem to be a 
problem. It's just chaffed wires in airline fuel tanks. I tend to 
believe that a tank is a small confined space, and it doesn't take much 
available gasoline, or whatever fuel to create a saturated vapor 
atmosphere, which is a ratio well above the explosive limit. And the 
time the atmosphere is within the limits of being dangerous is very 
limited. When fueling aircraft with gasoline, the concern is with a 
spark just outside the fill point. This is also with autos, and someone 
that walks up with a static charge, and sets the area off into flame. :(

Olin Lathrop wrote:
> solarwind wrote:
>   
>> What happens if there is a few sparks? Will it be a fire hazard?
>>     
>
> Not without oxygen.
>
>
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> (978) 742-9014.  Gold level PIC consultants since 2000.
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