Ventilating unit for carburetor

摘要

To maintain a float chamber at atmospheric pressure by quickly discharging fuel from the float chamber even when a relatively large amount of fuel gushes into the float chamber. A float chamber is provided for containing a predetermined quantity of fuel. The float chamber includes an upper end and a bottom. Main air paths are provided that include lower ends and upper ends. The lower ends are in communication with a space disposed above a surface of the fuel in the float chamber of the carburetor. A plurality of branches include lower ends and upper ends. The lower ends of the branches are open to the atmosphere. At least one expansion chamber is provided that is in communication with the upper ends of the main air paths and the upper ends of the plurality of branches. The at least one expansion chamber is positioned above the float chamber and includes a larger cross-sectional area relative to a cross-sectional area of the main air paths and the branches. Therefore, neither of the branches are blocked by fuel, and attenuated fuel will be quickly discharged via the main air paths and one of the branches.