| 摘要 |
PURPOSE: To lower requirement for precisions with respect to a shape and a position of a supply opening so as to reduce manufacture cost by providing a throttle opening for distributing fuel into a partial blowing chamber mounted in a casing hole between a main passageway and the partial blowing chamber, and using a throttle insert blocked in one side. CONSTITUTION: Fresh fuel flows endlessly into a partial blowing chamber 8 from an inflow passageway 19 through a bag hole 29 and a throttle opening 25 of a throttle insert 24 and further through a connection passageway 22. The fuel flows therefrom into a return passageway 21 through a connection passageway 20, and is supplied again into a fuel tank via another connection passageway. The throttle opening of each throttle insert 24 generate the same pressure drop for all six pumps' requirement between an inflow passageway 19 and a partial blowing chamber 86, and therefore the fuel is set to be supplied at the same flow rate to each partial blowing chamber 8. As a consequence, even in an extreme state, the fuel at the same temperature can be surely filled uniformly in a pump operation chamber. |
