A carburetor for an internal combustion engine including a body having an air inlet opening and air outlet opening. A throat is disposed in the body between the air inlet and outlet openings. A slide assembly is movably disposed in the body for crosswise movement across the throat. The slide assembly includes a stepped portion upstream of the throat and the lower portion of the air inlet opening is narrowed for concentrating and compressing the air entering the throat. A reservoir containing fuel is attached to the body. The fuel reservoir includes a fuel outlet located in the throat. An adjustable metering rod extends through the slide assembly and throat into the fuel reservoir. A recessed scoop is located in the body above the air inlet opening and is in air flow communication with the fuel reservoir. An air supply tube extends from the scoop to the fuel reservoir and is provided with a cone-shaped cavity and float ball therein to prevent the flow of fuel into the air supply tube if the fuel level rises in the reservoir.
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