which forms part of a magnetic circuit surrounds valve body 34 and has at the upper end upper guide 36 as shown space 36 a between upper guide 36 and armature 14 is about 0 010 to about 0 015 mm on the diameter and permits guiding movement of armature 14 lower o rings 38 provide sealing between the injector 10 and the engine intake manifold not shown and upper o rings 40 provide sealing between the injector 10 and the fuel rail also not shown valve body 34 defines central fuel flow opening 35 in fig2 valve body shell 32 is attached to valve body 34 preferably by weld 32 a and at the upper end by weld 26 a to non magnetic shell 26 non magnetic shell 26 is in turn welded to fuel inlet connector at 26 b thus fuel flowing from fuel inlet connector 18 across working gap 15 must flow through the clearance space 14 a between armature 14 and valve body shell 32 which is also provided to permit upward and downward movement of armature 14 the space 14 a is approximately 0 10 to 0 30 mm on the diameter of the armature 14 referring again to fig1 and 2 valve.