Just a couple of /6 questions

I just picked up a /6 duster from Als RapidTransit in Willows CA. Als a great guy to deal with.
Between the fuel pump and block is a hose barb pointed straght up, Is this part of a evac system? Can I plumb it into the aircleaner? It open to the atmosphere now and I want to clean up the engine compartment. Any help is appreciated.
Thanks everyone
Mike

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