Patent ID: 6851631

Claim:
A method of assembling 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 a magnetic pole piece having a first face having a first surface area; a seat secured at the second end of the tube assembly, the seat defining an opening; an armature assembly disposed within the tube assembly, the armature assembly having a second face disposed from the first face by a gap, the second face having a second surface area smaller than the first surface area; 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 filter located at the first end of the tube assembly, the filter having retaining portion; an O-ring circumscribing the first end of the tube assembly, the retaining portion of the filter maintaining the O-ring proximate the first end of the tube assembly; and a first attaching portion; providing a coil group subassembly including: a solenoid coil operable to displace the armature assembly with respect to the seat; a coil housing that surrounds the solenoid coil; and a second attaching portion; an overmold that encloses a portion of the coil housing within the overmold; and inserting the valve group subassembly into the coil group subassembly.