Abstract: A conversion system for a gasoline engine based generator enables the use of heavier fuels. A vertically disposed vortex separation chamber includes an inlet proximate the bottom of the chamber and tangential to the longitudinal axis of the chamber for delivering to the chamber partially vaporized fuel in an air-fuel mixture from a carburetor associated with the engine. An outlet proximate the top of the chamber also tangential to the longitudinal axis of the chamber for delivering vaporized fuel from the chamber to the engine. An electric heater is in communication with the bottom of the chamber for heating the chamber wall to vaporize any fuel thereon so vaporized fuel is reintroduced in swirling air-fuel mixture in the chamber. A battery source charged by the generator provides power to the electric heater. A jacket is disposed about and spaced from the chamber wall creating an annulus between the jacket and the chamber wall.