| 摘要 |
PROBLEM TO BE SOLVED: To provide a fuel-air mixture generating device which is able to unfailingly supply the required amount of fuel at a time of starting even in an engine which has small manifold vacuum, keeping the cost of the device low and without complicating the device configuration. SOLUTION: The fuel-air mixture generating device comprises diaphragm-type fuel pump 14, which intakes fuel in response to the pressure change in a crankcase of internal-combustion engine and discharges it to fuel path 25, fuel injection valve 30 for injecting and supplying fuel in the fuel path 25 at a prescribed timing to air intake system of the internal-combustion engine, and manual fuel pump 40 for supplying and filling fuel to the fuel path 25 when the diaphragm-type fuel pump 14 is not operated. Valve opening pressure of either the manual pump inlet valve 44 or discharge valve 43 is set higher than the injection pressure required at a time of starting and a needle valve 85 is disposed on a downstream side of the fuel injection valve 30 in the fuel path 25 as a means to limit the amount of fuel returning to fuel tank 81. COPYRIGHT: (C)2008,JPO&INPIT
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