| 摘要 |
This invention relates to a fuel injection system. The fuel injection system has a fuel proportioning valve (3,4) which is supplied by a fuel feed line (39). The fuel proportioning valve supplies fuel to fuel injection valves (not shown) via a diaphragm valve 25. A differential pressure regulator 35 is provided to alter the pressure in the system in accordance with engine parameters. The pressure in the system is controlled by system pressure valve 41. In operation excess fuel is returned to fuel tank 70. When the engine is switched off a stop valve 63 closes the return line and valve 25 is closed in response to a drop in pressure in the differential pressure regulator 35, thus sealing the system and maintaining the pressure within the fuel supply part of the system to facilitate easy restarting. Seals 73 are provided in the fuel proportioning valve (3,4) to prevent fuel leakage from the seal part of the system between the valve 3 and valve cylinder 4 of the fuel proportioning valve.
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