The carburetor utilizes air flow through the barrels to draw fuel out from the bowl(s). All carburetors work on two basic principles. One principle is the Bernoulli effect and the other is the venturi effect. Vacuum increases along with velocity in regard to The Bernoulli effect. If a carburetor is developed based on this principle it will have a fuel nozzle placed in the high velocity/low pressure (vacuum) region which allows the drawing of fuel into the air stream and atomizes it into a tiny mist of fuel droplets.
A carburetor that is developed and operates on the venturi effect will have a venturi (narrow passageway) in a tube that is responsible for increasing flow velocity. The carburetor will have a venturi area in the middle of the throat that increases velocity of the air stream. A booster venturi is placed in the main venturi area to further create air velocity plus create a region of very low pressure (vacuum). The fuel nozzle will be located in the booster venturi where there is the most vacuum. This allows fuel to be drawn into the air stream and atomized into tiny droplets. The position of the throttle plates/valves will determine how much air and fuel can enter the engine.
Visit the Performance Carburetor Basics page to read complete details.
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