Modular fuel injector and method of assembling the modular fuel injector

A fuel injector (100) for use with an internal combustion engine. The fuel injector (100) comprises a valve group subassembly (200) and a coil group subassembly (300). The valve group subassembly (200) includes a tube assembly having a longitudinal axis that extends between a first end (200A) and a second end (200B); a seat (250) that is secured at the second end (200B) of the tube assembly by a retainer (259) and that defines an opening; an armature assembly (260) that is disposed within the tube assembly; a member (270) that biases the armature assembly (260) toward the seat (250); an adjusting tube (281) that is disposed in the tube assembly and that engages the member (270) for adjusting a biasing force of the member; a filter (285) that is at least within the tube assembly and a lift setting device disposed within the valva body. The coil group subassembly (300) includes a solenoid coil (310) that is operable to displace the armature assembly with respect to the seat (250).