B4000 2WD V6-4.0L OHV (1994)
Fillpipe Restrictor: Testing and Inspection
Use a suitable dowel gauge to check restrictor opening [1].
Inspect for; tampering, broken flapper, excessive wear etc..
Remarks
[1] N&W Manufacturing part number FRG-95, or equivalent, (must be made of non-sparking material, 1552 alloy suggested).
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Minimum tool diameter 0.9375"
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Maximum tool diameter 0.9500"