Patent ID: 7047941
Filing Date: 2006-05-23
Classification: F02M

Abstract:
1. A fuel injection system for supplying pressurised fuel to a fuel injector, the fuel injection system comprising: 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, the pump arrangement including a pump chamber defined within a plunger bore, and a plunger which is movable within the plunger bore to cause pressurization of fuel within the pump chamber; and a valve arrangement disposed in the fuel supply passage between the pumping chamber and the accumulator volume and operable between a first position in which i) fuel at the first injectable pressure level is supplied to the fuel injector and ii) 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 fuel at the first injectable pressure level is supplied to the injector 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 level to be supplied to the fuel injector.