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 {HEAD ~ gasoline volatilization}, and the incoming air is capable of conveying into the tank a portion of 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 { HEAD ~ gasoline volatilization } , and the incoming air is capable of conveying into the tank a portion of the volatilized gasoline already adsorbed on the fine carbon particles
OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH TAIL TAIL TAIL TAIL TAIL OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH HEAD HEAD HEAD HEAD HEAD HEAD OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH OTH