Abstract: A multi-fuel system which will operate the usual factory-manufactured gasoline powered internal combustion engine efficiently on any one of a number of different fuels without modifying or changing the engine. The system involves a non-venturi type of carburetor having a metered inlet and means for controlling the pressure of each fuel delivered to the inlet in accordance with the stoichiometric ratio of that fuel which assures that the proper fuel/air ratio is delivered to the mixing chamber of the carburetor without requiring any change in either the carburetor or engine when a different fuel is used. Additionally, the fuel delivered to the fuel inlet is then directed into the fuel/air mixing chamber without subjecting the fuel to the suction in the intake manifold of the engine.