Difficulties finding carburetor fuel inlet

Webble

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Hello,
I recently bought a 1977 cb750 k7, however, the fuel lines weren't connected. It looks like the carburetors have two inlets on top, but I can't find which one connects to the fuel tank or if both have to be connected. Could anyone point out what each inlet is used for?
Carburetor inlet.jpg
 

madmtnmotors

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dirtdigger is correct. The vent (#1) would have originally had a short (6" or 8") hose routed back to a clip on top of the air cleaner, pointed toward the rear, open to the atmosphere.
 
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