To always stabilize a discharge amount of acceleration fuel in a plunger type acceleration pump device without being influenced by manufacturing error of interlocking mechanisms between a throttle valve and a pump plunger.
A back stopper surface 48 and a foreward stopper surface 49 are formed on a cylinder hole 31 for regulating back and foreward motion of a pump plunger 32, in order to obtain constant operation stroke S of the pump plunger 32 corresponding to acceleration operation of a throttle valve 25. In addition, a seal member 35 is arranged between the sliding surfaces of the pump plunger 32 and the cylinder hole 31. A leak jet 46 is formed between a discharge valve 44 and an injection hole 8a of an acceleration nozzle 8 for circulating a part of the fuel having passed through the discharge valve 44.
FUJITA SHIGEYUKI
ANDO HIDEAKI
YOSHIDA YUTAKA
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