Fuel used during curb idle and low speed operation flows through the main metering jet into the main well as shown in the image. An angular connecting idle well intersects the main well. An idle tube is installed in the idle well. Fuel travels up the idle well and mixes with air which enters through the idle air bleed located in the bowl cover. At curb idle, the air and fuel mixture flows down the idle channel and is further mixed or borken up by air entering the idle channel through the transfer slot which is above the throttle plate at curb idle. During low speed operation, the throttle plate moves, exposing the transfer slot, and fuel begins to flow through the transfer slot as well as the idle port. As the throttle plates are opened further and engine speed increases, the air flow through the the carburetor also increases. This increased air flow creates a vacuum or depression in the venturi, and the main metering system begins to discharge fuel.