Fuel injection device for internal combustion engines

A fuel injection device for internal combustion engines, having a pump piston (1) guided in a cylinder bore (3) of a pump housing (5), the piston being driven axially back and forth by a cam drive (7) and with one face end (11), remote from the cam drive (7), defining a pump work chamber (13), which communicates via a pressure conduit (15) with an injection valve (17 ) that protrudes into the combustion chamber of the engine to be supplied, and which is supplied with fuel from a fuel source (21) via a fuel line (19), which for controlling the high-pressure phase includes an electrically triggered magnet valve (25), whose valve member (31) is actuated by an electric actuator (33), divides a high-pressure chamber (43), formed by the pump work chamber (13) and the adjacent part of the fuel line (19) leading to the fuel source (21), by the contact of a sealing face (45) with a valve seat (47), or opens the communication between the two upon lifting up from the valve seat (47), wherein the valve member (31) has an annular cross-sectional constriction (65) in the region of a pressure chamber (37) that communicates with the high-pressure chamber (43), the valve member (31) has a bore that communicates continuously with the low-pressure chamber (41) and that in the event that the valve member (31) fractures in the region of the cross-sectional constriction connects the high-pressure chamber (43) to the low-pressure chamber (41).