What size is the bleed valve??

Dons4600

New User
Good evening, I am currently working on getting my '79 4600 back up and running and I made the mistake of tightening the bleed screw on the top of the fuel filter assembly too far and the top of the bleed screw detached... I am trying to find a replacement and I cannot seem to figure out the size? Do I go off the site of the hex head? Because the screw portion is not the same size...Can anyone help? Been a heck of a time getting this baby running again.
 

You go by thread size and pitch, not the hex size. It looks like there are two choices. One is metric, 10mm x1.5 pitch x 17.50mm long, part number D1NN9N026A. The other is 5/16 - 24 x 7/16" long, part number C5NN9N026A. 10MMX 1.5 capscrew should screw in if it is metric thread and a 5/16 fine thread bolt will screw in if it is SAE thread.
 

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