u/Educational-Pea-2885

I just cleaned out the carburetor and spark plug on my project bike, but when I was putting the bike back together, I realized that I have no clue where/if I should plug these tubes in. The tube from the first picture comes from the underside of the fuel tank, and the tube from the second picture comes from under the seat. My first guess would be to plug them together, but I think that would go terribly if they are both vent tubes. Anybody recognize what these are for?