Abstract: Both a system for an method for feeding gasoline fuel into a gasoline internal combustion engine are disclosed herein. This system and method is suitable for use after an internal combustion engine has been started and warmed to normal operating temperature. The system incorporates a two-way valve to stop the flow of fuel to the standard carburetor and direct the flow of fuel to our system and method. Our system incorporates a multi-port valve which selects a predetermined amount of fuel and directs the fuel to the Positive Crankcase Ventilation (P.C.V.) vacuum line which is run thru hot exhaust gases. The fuel by means of P.C.V. vacuum line is fed directly into the intake manifold. The resulting fuel has been vaporized, it is fed into the intake manifold, and mixed with air for combustion. This results in a low pollutant emission and high efficiency. The air for combustion is still controlled by the standard carburetor air intake and control.