found a couple other threads that suggest it may have been connected in some way to the vacuum pump on the fuel filter - but no one seems to know why. I think I'll leave it and just put a plug over the top of it to keep it clean and open in case I ever figure out the purpose for it.

I have a pic of it but having trouble figuring out how to post pics. I'll see if I can figure it out and post pic later.

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IMG_1873a.jpg (35.57 KB, 135 downloads)

Last edited by Clark6400; 02/25/2018 3:40 AM. Reason: add photo