Patent ID: 7143746

Claim:
A fuel injection system for supplying pressurised fuel to a fuel injector, the fuel injection system comprising: a rocker shaft, an accumulator volume for supplying fuel at a first injectable pressure level to the fuel injector through a fuel supply passage, a pump arrangement for increasing the pressure of fuel supplied to the injector to a second injectable pressure level, and a valve arrangement disposed in a fuel supply passage between the pumping chamber and the accumulator volume and operable between a first position in which fuel at the first injectable pressure level is supplied to the injector and the pump chamber is in communication with the accumulator volume such that fuel at the first injectable pressure level may flow from the accumulator volume to the pump chamber, and a second position in which communication between the injector and the accumulator volume is broken so as to permit fuel at the second injectable pressure to be supplied to the injector, wherein the accumulator volume is comprised in the rocker shaft.