Abstract: Disclosed is a fuel vaporizer system for forming a mixture of vaporized fuel and air and injecting the mixture into the intake manifold of a spark ignition internal combustion engine. The vaporizer unit includes a canister containing a controlled liquid level of fuel and a foraminous body partially submerged in the liquid fuel to promote rapid vaporization of the fuel. The canister contains a dividing wall above the foraminous body so that air drawn into the canister must pass through the foraminous body and mix with the vaporized fuel. The vaporization unit functionally parallels the conventional carburetor and includes means to control the flow of gas through the vaporizer and control the pressure in the intake manifold.

Abstract: Disclosed is a system for injecting a mixture of vaporized fuel and air into the intake manifold of an internal combustion engine downstream from the carburetor throttle valve. The system includes a sealed vaporizer operationally parallel with the conventional carburetor system. The vaporizer includes a stabilized float valve for controlling fuel flow therethrough and various check valve arrangements and component arrangements which eliminate any possibility of lost fuel in case of collision or upset of a vehicle powered by an engine employing the vaporizer system.