To easily mount an acceleration pump, the structure of which is simplified, on a membrane type carburetor without applying processing on a carburetor body.
A bellows-form elastic expansion member 75 the volume of which is changed by the pressure of an intake passage 16 is arranged in an airtight manner at the internal part of a container 77 to form an acceleration pump B. A pump chamber 78 between a container 77 for the acceleration pump B and the elastic expansion part 75 is communicated to the atmosphere chamber 30 of a membrane type carburetor. A restriction 80a is arranged in an atmosphere hole 80 formed in the wall part f the atmosphere chamber 30. A restriction 71 is located in a passage 72 to interconnect the intake passage 16 and a negative pressure chamber 76 at the internal part of the elastic expansion member 75 of the acceleration pump B.
TOBIUCHI TERUHIKO
OSADA NORISUKE
KOBAYASHI TAKESHI
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