The drain tube is always open, connected to a tube that routes drainage down below everything. My drain tube hangs down about 3" below the bottom of the bike. If the evap system is missing then you can run a drain hose from the tube that connects to the filler cap vent, identify which is which by pouring a little liquid down the tube end located in the filler cap area, it's the one with a gasket to mate with a nipple on the filler cap itself. The other one you can cap.
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