Abstract: A fuel system for providing fully vaporized, air-free gasoline to a carburetor of an internal combustion engine. The system includes an air-free liquid gasoline receptacle having means maintaining a liquid free space above the surface of liquid gasoline in the receptacle, a heater within the receptacle and having an expanded surface of which at least a substantial portion extends upwardly out of the liquid gasoline into the space there above, means for producing a vacuum within the receptacle to promote evaporation of liquid gasoline from the expanded surface and for compressing the resulting gasoline vapors, and air-free means for filtering condensed droplets of gasoline from the resulting gas vapors.