Abstract: A fuel injection device having a fuel pump and an injection line connected to a pump work chamber and communicating with an injection nozzle via an interposed closing valve which closes toward the pump work chamber. Via the injection end of a magnetic control valve connected to the pump work chamber fuel can be supplied under pressure to the side of the closing valve remote from the pump work chamber and in which again via this closing valve, a connection to a return line can be opened. The actuating element of the closing valve closes toward the pump work chamber and is embodied as a differential piston including a first face which under pressure is urged in a closing direction and is larger than the effective fluid pressure surface area of a second face which urges the valve closing element in the opening direction.