Abstract: A gasoline vaporizer apparatus to be interposed between a carburetor and an intake manifold of an internal combustion engine comprises a housing having the carburetor supported on one end and the other end connected to the intake manifold and having a first chamber and a second chamber therein. A first plurality of passages each communicate the first chamber with the second chamber and a second plurality of passages each communicate the second chamber with the intake manifold. A rotor is mounted in the second chamber for rotation in response to suction at the intake manifold effected by intake strokes of pistons of the combustion engine. The rotor has a plurality of generally L-shaped passages therethrough to receive gasoline from the first plurality of passages and discharge vaporized gasoline into the second chamber.