When the universal gasoline engine is running, fuel level in the fuel tank gradually drops and {TAIL ~ air} in the atmosphere is able to enter the fuel tank in the direction opposite to the route of gasoline volatilization, and the incoming air is capable of conveying into the tank a portion of {HEAD ~ the volatilized gasoline} already adsorbed on the fine carbon particles 
When the universal gasoline engine is running , fuel level in the fuel tank gradually drops and { TAIL ~ air } in the atmosphere is able to enter the fuel tank in the direction opposite to the route of gasoline volatilization , and the incoming air is capable of conveying into the tank a portion of { HEAD ~ the volatilized gasoline } already adsorbed on the fine carbon particles
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