Abstract: A device for feeding vaporized gasoline into the intake of an internal combustion engine. The fuel-air line leading from the conventional engine carburetor is passed through a chamber heated by exhaust gas to the intake ducts of the engine. The fuel line from the fuel pump travels through an electrically operated valve which directs the fuel either to the carburetor, for starting the engine, or alternately in a warmed engine, to a metering valve located on the fuel-air line in the heated chamber. The fuel line from the valve to the metering device passes through an auxilliary heating chamber to vaporize the fuel prior to its passage through the metering device into the engine fuel-air line.