Patent ID: 6854962
Filing Date: 2005-02-15
Classification: F02M

Abstract:
1. A pump system for a fuel injection system, the pump system comprising: a body defining a high pressure pumping chamber; a plunger disposed in the pumping chamber for pressurizing fuel; a high pressure outlet; a high pressure fluid line connecting the pumping chamber to the outlet; a control valve along the fluid line, the control valve including a first valve body movable between a closed position in which pressurized fuel is routed from the pumping chamber to the outlet and an open position in which pressure relief is provided to the fluid line; and a valve and restriction arrangement along the fluid line, including a restriction and a second valve body, the second valve body being movable between an open position in which fuel flow from the pumping chamber is generally unrestricted by the restriction and a closed position in which fuel flow from the pumping chamber is significantly restricted by the restriction to store energy in the pumping chamber.