Importance

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Abstract

A fuel pump comprising:

a pumping chamber with a pumping plunger arranged to reciprocate within the pumping chamber;an inlet passage at least indirectly connecting a low-pressure inlet of the fuel pump to the pumping chamber, an inlet valve being adapted to selectively enable flow through the inlet passage to the pumping chamber;an outlet passage at least indirectly connecting the pumping chamber to a high-pressure outlet of the fuel pump, an outlet valve being adapted to selectively enable flow through the outlet passage to the outlet; anda relief passage connecting the outlet passage, downstream of the outlet valve, to the pumping chamber, a relief valve being adapted to selectively enable flow through the relief passage to the pumping chamber.

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First Claim