That factory brass fitting is a 5/16 tubeing from the filter and the thread that screws into the injection pump is 1/2x20 machine fine thread with an o-ring for the seal. We can thank Knuckledragger for discoverying this for us. I was visiting with him at his shop one day. I showed him what I was building for a new fuel filter and he figured out what the threads were on this fitting for me... And I thought it was something really special....
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