a fuel chamber to the height of and between two air suction passages main nozzles are connected to upper end portions of the main fuel passages and the low speed fuel passages are bent at its upper end in horizontal directions to reach low speed ports air bleed passages for respective fuel passages are formed to extend from near inlets of air suction passages in horizontal directions to communicate with the fuel passages respectively application_number US 99402797 A description some embodiments of the invention are described below with reference to the drawings fig1 through 4 show a dual carburetor embodying the invention in which a cup shaped fuel bowl 3 is mounted under the carburetor main body 1 having two air suction passages 2 2 extending in parallel in a horizontal direction the interior of the fuel bowl 3 forms a fuel chamber 6 containing a float 5 for opening and shutting a fuel valve 4 each of these two air suction passages 2 2 has a choke valve 7 venturi 9 and throttle valve 10 from its inlet toward the outlet two choke valves 7 are attached to a single choke valve rod 8 extending across and supported by the carburetor main body 1 to open or close the air suction passages 2 2 simultaneously similarly two throttle valves 10 are attached to a single throttle valve rod 11 extending across and supported by the carburetor main body to open or close the air passages 2 2 simultaneously contained.