| 摘要 |
PURPOSE:To enable to continue operation of an engine with only low volatile fuel, by a method wherein high volatile fuel is supplied by actuation of a high volatile fuel supply device at the time of starting of the engine and the low volatile fuel is supplied by a low volatile fuel supply device after starting of the engine. CONSTITUTION:Gasoline is kept supplied beforehand to a suction passage 32 of a carburetor from a nozzle 33 through actuation of a manual pump 30 prior to starting of an engine. An air-gasoline mixture to be formed within the suction passage 32 is supplied to a combustion chamber 24 through a crankcase 19 and a scavenge chamber 26 and reliable starting can be fulfilled. When pressure of the vicinity of the scavenge passage 26 becomes low after starting of the engine 11, a low volatile fuel supply device 36 is actuated and a kerosene-air mixture is supplied to the scavenge chamber 26 through a communication hole 45. Then when the pressure of the vicinity of the scavenge chamber 26 becomes high in an expansion stroke of the engine 11, the air-fuel mixture in the scavenge chamber 26 is sucked into the combustion chamber 24 and a stabilized low rotation of the engine 11 can be fulfilled. |
