The one on the side is from the fuel tank. The one on the bottom is a vacuum port which goes to a vacuum port on the engine block to operate the pump. Fuel flows directly to the carb internally.
I can send you a Service Manual for the engine IF you like. Address below, put in proper format and remind me what engine you have and what you want. The engine model number will be stamped into the cooling shroud around the spark plug area on the left as you look at the carb side. I will be gone for a couple of hours.
Walt Conner
wconner5 at frontier dot com