Modular fuel injector having a surface treatment on an impact surface of an electromagnetic actuator and having a lift set sleeve

A method of manufacturing a fuel injector, comprising:

• providing a valve group subassembly including:
• a tube assembly having a longitudinal axis extending between a first end and a second end, the tube assembly including an inlet tube having an inlet tube face;
• a seat secured at the second end of the tube assembly, the seat defining an opening;
• a lift sleeve telescopically disposed within the tube assembly a predetermined distance to set a relative axial position between the seat and the tube assembly;
• an armature assembly disposed within the tube assembly, the armature assembly having an armature face, at least one of the armature face and the inlet tube face having a first portion generally oblique to the longitudinal axis;
• a member biasing the armature assembly toward the seat;
• an adjusting tube located in the tube assembly, the adjusting tube engaging the member and adjusting a biasing force of the member;
• a first attaching portion;
• providing a coil group subassembly including:
• a solenoid coil operable to displace the armature assembly with respect to the seat;
• and
• a second attaching portion;
• inserting the valve group subassembly into the coil group subassembly;
• and
• connecting the first and second attaching portions together.