I'm rebuilding the vacuum line system on my K-Jet B21F. I thought I labeled everything pretty well, but now as I replace all lines with silicon, I find I missed one connector, and am not sure where it connects to.


You can see the nipple in question. This is coming off a check valve connected to a T on the main line that goes between the throttle body and the lower aux air valve. You can see that on this check valve, there is another line that loops back to the throttle body as well. The remaining connector is a mystery.
I've checked the CIS green book sections and can't find a vacuum hose diagram. Anyone have any ideas?
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