| 摘要 |
The present application relates to a pump unit (301) for a fuel injection system. The pump unit (301) comprises an inlet sealing ring (311), a pumping chamber (305) and a plunger (321) for pressurising fuel in the pumping chamber (305). The inlet sealing ring (311) is movably mounted on the plunger (321). The sealing ring (311) is movable between a first position in which a fluid pathway between the pumping chamber (305) and a supply line (317) for supplying fuel is open, and a second position in which the fluid pathway between the pumping chamber (305) and the supply line is closed (317).
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