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			I think the concern is about a difference in potential between the gas pump and the car which may result in a spark. Given the location of where that spark is going to jump if it does, it definitely could end badly. 
 
Here it is the law, and a gas station attendant will not turn on the pump for you until you turn off your engine.
		 
		
		
		
		
		
		
			
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				'99 black 986
			 
		
		
		
		
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