| 摘要 |
PURPOSE:To feed optimum air-fuel ratio of mixture to an engine and at the same time to prevent vapor lock occurring by adjusting the fuel pressures by means of negative ventury pressures generated corresponding to the air suction rate and by adding a constant pressure to the fuel pressure controlled with a fuel pressure adjuster. CONSTITUTION:When negative ventury pressures are weak, the opening of an escape valve 23 is great to increase fuel delivery and decrease fuel pressures in a fuel chamber 16. Accordingly the delivery out of a fuel adjuster 13 is small. As the negative ventury pressure becomes stronger, a diaphragm 19 is sucked and moved toward a negative pressure chamber 18 to decrease the opening of the escape valve 23, and to increase the fuel pressures and fuel delivery. However, a pressurizing means 28 exerts pressure via diaphragms 19 and 17 on the valve 23 to make its opening further smaller. Fuel pressurized in this way is depressurized by the amount of pressure thus added by means of a pressure adjuster 15 and blows out of a fuel nozzle 12. Generation of vapor bubbles due to the rise in the fuel temperature is also prevented. |
