| 摘要 |
PROBLEM TO BE SOLVED: To provide an automatic extracting device for residual fuel in a carburetor capable of returning residual fuel in a float chamber of the carburetor positively to a fuel tank by intake negative pressure accumulated in a negative pressure surge tank and extracting residual fuel by the switching operation of a single switching cock, and reducing the number of parts to reduce cost. SOLUTION: The automatic extracting device for residual fuel in the carburetor comprises a fuel supply passage 15 connecting the fuel tank TF to the float chamber 10; a negative pressure passage 17 connecting an intake passage 8 to a vacuum operating chamber 53 of a diaphragm pump PD; a fuel extraction passage 16 connecting the float chamber 10 to the fuel tank TF; the single switching cock CO provided straddling the fuel supply passage 16 and the negative pressure passage 17; the negative pressure surge tank TS provided in the negative pressure passage 17; and the diaphragm pump PD connected to the fuel extraction passage 16 and operated by the negative pressure of the negative pressure surge tank TS. The residual fuel in the float chamber 10 is returned to the fuel tank TF by the diaphragm pump PD operated by negative pressure from the negative pressure surge tank TS by the switching of the switching cock CO. COPYRIGHT: (C)2008,JPO&INPIT
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