Abstract: A method and apparatus to improve the fuel utilization of internal combustion engines by inducing a magnetic field in the fuel before it flows into a carburetor or fuel injector system. Aluminum or steel fittings connect a rubber fuel line between a fuel pump and a carburetor or fuel injection system of an internal combustion engine. A magnet assembly having one or more permanent magnets is secured against the fuel line so a preselected pole is in contact with the rubber fuel line. A rubber shield or wrap surrounds the magnet assembly and the portion of the fuel line in contact with the magnet assembly to shield the magnetic field about the fuel line. The one or more magnets direct a magnetic field toward the fuel line to induce a magnetic field into fuel flowing through the fuel line. The magnetic field induced in the flowing fuel is believed to ionize the hydrocarbon fuel to increase combustion efficiency, thus, increasing fuel economy and decreasing fuel emissions.