FUEL INJECTOR

The invention relates to a fuel injector (10), in particular a common rail injector, with an injector housing (11) in which a high pressure chamber (15) is formed, which can be supplied with pressurized fuel via a supply bore (19) arranged in the injector housing (11), with at least one injection opening (12) formed in the injector housing (11) and connected at least indirectly to the high pressure chamber (15) for injecting fuel into the combustion chamber of an internal combustion engine, with an injection member (16) that releases or closes the at least one injection opening (12), and with a measuring device (30) for at least indirectly detecting the pressure in the high pressure chamber (15) or the supply bore (19), wherein the measuring device (30) is designed to detect an elastic deformation of a deformation region (27) arranged in operative connection at least indirectly with the supply bore (19) or the high pressure chamber (15), wherein the measuring device (30) comprises a sensor element (32) designed as a piezo element (31; 31 a) with two electrodes (35, 36), wherein the sensor element (32) is connected at least indirectly to the deformation region (27), wherein a first electrode (35) on the side of the sensor element (32) facing away from the deformation region (27) forms an overlap region (40) with a second electrode (36), and wherein in the overlap region (40) of the two electrodes (35, 36) they are arranged at least partially, preferably completely electrically isolated from one another.