| 摘要 |
PURPOSE:To prevent an air-fuel ratio from fluctuating when a valve seat is opened, by a method wherein when closing a bypass mixture supplying passage, a fuel tending to stagnate in proximity to a valve seat is caused to flow out through a leak passage. CONSTITUTION:A mixture bypass fuel system is constituted of an air passage 8 communicated with a fuel nozzle hole 7, an air-adjusting screw 9 for adjusting the cross-sectional area of the passage 8, a solenoid valve 10, the valve seat 12 located in the passage 8 oppositely to a plunger 11 for the valve 10 and a bypass mixture supplying passage 13. In addition, the leak passage 14 bypassing the valve seat 12 is provided in the main body 1 of a carburetor. Accordingly, even when the solenoid valve 10 is closed, the fuel stagnating at a lower part of the plunger 11 automatically flows out into the passage 13 through the leak passage 14 and a leak passage 15. |
