Eiger 400 - Need help with fuel hose / vac line routing

Can someone explain the fuel / vacuum hose routing on the Eiger 400?

Nipple on the top back of the carb - assuming vacuum.

Large metal barb on the bottom left side of the carb. Assuming fuel feed.

Black angled barb on the left / airbox side of the carb - Not sure what this one does

Small barb on bottom bowl of the carb. Assuming this is a vent / overflow.