Abstract: To restart an alcohol fueled engine at low temperatures, a quantity of liquid ethanol is supplied to a vaporizing chamber before the engine is stopped. When restarting the engine, some of the alcohol in the vaporizing chamber is delivered to an igniter, and the hot gases resulting from the burning alcohol are conducted past the vaporizing chamber to evaporate the liquid alcohol remaining in the vaporizing chamber. The alcohol vapor thus generated is conducted to the engine induction system to start the engine.

Abstract: A method and apparatus for utilizing both a liquid fuel and a gaseous fuel with a minimum change in a standard internal combustion engine. The gaseous and liquid fuels are fed from separate fuel supplies with the flow of fuels being controlled in response to engine load so that at engine idle only gaseous fuel is supplied and combusted by the engine and both gaseous and liquid fuels are supplied and combusted when the engine is operating under load conditions.

Abstract: A carburetor having a fuel mixing valve with multiple vanes which control the flows of main and secondary fuels into a valve mixing chamber. The octane rating of the fuel charge may be momentarily increased during periods of engine acceleration to permit the engine to have a higher compression ratio for optimum efficiency with a relatively low octane fuel. The fuel flow controlling vanes may be mounted on a common shaft for simultaneous movement or on separate support means for differential movement in response to an engine control. A fuel mixing valve is also disclosed for use with the second stage components of a two stage carburetor.

Abstract: A fuel system having an overhead tank for gravity feeding marine diesel oil to an engine and a pump for feeding heavy fuel oil to the engine, a mixer connected to the outlet of the tank and the pump and to the inlet of the engine and a flow control valve provided for regulating the flow of the heavy fuel oil whereby the fuel oils become mixed fuel oil and then flow into the engine.