Patent ID: 6726458
Filing Date: 2004-04-27
Classification: F02M,F04B

Abstract:
A high pressure pump for pumping a motor vehicle fuel, and comprising:a main unit for pumping the fuel, which unit is actuated by a secondary unit for pumping a working liquid; the secondary unit having means for filling a reservoir with working liquid, the filling means including a filling neck connected to the reservoir which is selectively plugged by a plug; the plug being provided with a plugging surface that mates with a plugging seat formed in the neck; the neck having a space for containing an excess of working liquid overflowing from the reservoir; an overflow level extending into the neck above the seat; the plug moving in the neck in the presence of the overflow of working liquid, between a position of pre-plugging, in which the plugging surface is removed from the seat, and a position of plugging in which the plugging surface is in sealed contact with the seat; wherein the plug further comprises an axial blind hole forming a receptacle for the overflow and communicating via a radial bore of the plug, with a peripheral counterbore of the plug which is extended axially by the plugging surface, the counterbore being connected to the reservoir when the plug is in its pre-plugging position.