Shetley fuel economizer

Abstract

The present invention provides a fractionating vaporized fuel system which provides a mixture of fresh air and vaporized lower boiling fractions of gasoline to the intake passage of an internal combustion engine. More specifically, the system uses hot engine coolant to vaporize the lower boiling fractions of a fuel such as gasoline for combustion as a vapor, and the higher boiling fractions are returned to the tank as a liquid for other uses. Intake air is heated by the exhaust manifold before being drawn through a vaporizing chamber and mixed with the vaporized fuel. The warm air/vaporized fuel mixture is then introduced to the engine prior to the choke plate of a carbureted or fuel injected engine. In this manner the vaporized fuel system is able to provide improved efficiency and reduced emissions throughout the entire range of engine requirements.

Dependencies are inferred from the claim text.