Air Quality Criteria for Particulate Matter

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.

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