Abstract: The invention relates to a common rail injector having an injector housing (2), which communicates via a fuel inlet (3) with a central high-pressure reservoir, which is supplied with fuel from a fuel tank, which fuel, as a function of the position of a 3/2-way magnet valve (4), passes into a high-pressure bore (5) of an injection nozzle (6), and the 3/2-way magnet valve (4) has a control piston (14), which can be moved back and forth between a closed and an open valve position and which on one of its two ends is coupled with an armature (15) and whose other end projects into a pressureless chamber (9), and in the open valve position the fuel inlet (3) communicates with the high-pressure bore (5) of the injection nozzle (6), and in the closed valve position, the fuel inlet (3) is closed by the control piston (14) and the high-pressure bore (5) of the injection nozzle (6) communicates with a fuel outlet (12) and with the pressureless chamber (9).