Gas to #1, cap off #2. Not sure but I'm guessing #2 was for a primer. Make sure the diaphram under the cover near #1 is flexible and that the pump flappers are not curled or otherwise distorted. Also, be sure the diaphram under the cover with the 4 retaining screws is also flexible and that the metering needle also moves freely. You might need a rebuild kit if the carb has very much use on it.