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A fuel delivery system for an internal combustion engine, including a vaporizing chamber for combining liquid fuel and air to produce a vaporized fuel and air mixture, a vapor expander which communicates with the chamber for expanding and further vaporizing the mixture, and a metering device which c

A fuel delivery system for an internal combustion engine, including a vaporizing chamber for combining liquid fuel and air to produce a vaporized fuel and air mixture, a vapor expander which communicates with the chamber for expanding and further vaporizing the mixture, and a metering device which communicates with the expander and with the engine for supplying engine vacuum to the system and controlling the amount of the mixture which is supplied to the engine. The vaporizing chamber includes a reservoir for storing a quantity of liquid fuel, an air inlet, a jet which sprays liquid fuel into the chamber, and a reservoir heater which heats the liquid fuel in the reservoir. The vapor expander includes a tubular passage communicating between the chamber and the metering device and a heating conduit coiled around the tubular passage to carry heated engine coolant and transfer heat to the mixture. The vapor expander also includes a plurality of perforated baffles mounted within the tubular passage to further promote the transfer of heat to and the vaporization of the mixture. The metering device includes an air inlet for providing additional air to the mixture, a mixture outlet for conveying the mixture to the engine, a venturi chamber between the inlet and the outlet for increasing the velocity of flow of the mixture, a choke valve mounted within the air inlet and adapted to control the flow of air through the inlet, a mixture inlet opening into the venturi chamber and adapted to communicate with the vapor expander, and a mixture control valve to regulate the amount of the mixture conveyed to the engine.

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A fuel vaporization and delivery system for an internal combustion engine, comprising: a vaporizing chamber having a first air inlet and a mixture outlet and further comprising a reservoir for storing a quantity of fuel wherein said first air inlet is positioned for providing for the passage of inco

A fuel vaporization and delivery system for an internal combustion engine, comprising: a vaporizing chamber having a first air inlet and a mixture outlet and further comprising a reservoir for storing a quantity of fuel wherein said first air inlet is positioned for providing for the passage of incoming air over said reservoir, a jet nozzle within said chamber and communicating with a source of pressurized fuel, for spraying fuel into said air and supplying fuel to said reservoir, the passage of air over said reservoir and the spraying of said fuel producing a fuel and air mixture, a first baffle disposed within said chamber between said first air inlet and said nozzle, and a second baffle disposed within said chamber between said nozzle and said outlet, said baffles adapted to produce a swirling motion in said mixture, thereby promoting the vaporization of said fuel; a metering device having a second air inlet for providing additional air to said mixture, the metering device communicating with said chamber and with said engine for controlling the amount of said mixture supplied to said engine; and an intermediate vapor expander including a heated region positioned between and in communication with said mixture outlet of said vaporizing chamber and said metering device for further vaporizing the fuel and air vapor mixture between the vaporizing chamber and the metering device.