To provide a floatless type carburetor in which fuel vapor is led into a fuel nozzle as soon as possible when it led into a constant pressure fuel chamber, so as to prevent the air-fuel ratio of mixture from becoming excessively lean due to the fuel vapor.
A floatless type carburetor comprises a fuel well 45 communicated with the lower end of a fuel nozzle 11, a constant pressure fuel chamber 26 communicated with the lower end of the fuel well 45 through an outlet hole 47, a fuel pump 24 located in fuel passages 23a, 23b between an inlet hole 36 of the constant pressure fuel chamber 26 and a fuel tank T, and a fuel introduction control valve 35 for controlling the introduction of fuel into the constant pressure fuel chamber 26, the fuel introduction control valve 35 including a valve seat member 37 having a lower end part which is communicated with the fuel well 45 through a bypass passage 50 extending above the constant pressure fuel chamber 26.
ISHIKAWA HIROHISA
KAMIYA NAOYUKI
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