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[Jonathan]

That is just a "vent" hose.

Depends which hose was being circled. I agree with you on the vent hose on the left coming from the top of the control pressure regulator.

The hose coming off the backside of the oil filler plug there looks to be like it also is cut off. It might just be the angle of the photo and it could be pointing straight down, but that one generally is plugged into the air filter housing. As part of the evaporative system to keep all fumes or gases contained, it recycles those fumes back into the air inlet system. I have heard others say this won't affect air or vacuum as it should be on the side of things before it gets metered, but I personally don't like to look past a known connection that isn't per the design and assume it isn't having an impact. Might be small, might be no impact at all, but is also very easy to connect it the way it was supposed to be.

IMG_4463.jpgVacuum_Routing.jpg

EDIT: Also, Jerry, what's that hose in the upper right hand corner of your photo, just to the right of the blue plastic connector? It looks to me like a hose with a split in it. The brownish diamond-y shaped part that looks like a split in the hose, but can't really tell.