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Carburetor Hoses and Ports:
Note that all locations are described based on holding the carb in your hand with the suction chamber upright and the rear of the intake throat (butterfly end) facing away from you.
1. Vacuum connection. Located at the rear of the suction chamber, it is a tube about 1/8" in diameter and has a prominent nipple on the end. If you are not using a vacuum-advance distributor, cover this tube with some sort of blank tube cover or line cap. If you plug the tube (or any other tube or hose connection for that matter), make sure you can unplug it should you require its use in future.
2. Float bowl vent. This is a tube about ¼" in diameter located on the right side of the carb at the base of the suction chamber. Connect this to the air cleaner.
3. Fuel inlet. Located directly below the float bowl vent. Connect this to the supply line from the fuel pump. This line should have a hose clamp around it at the carburetor for safety reasons.
4. Large tube at right base of suction chamber and to the rear of the fuel bowl vent. Cap this line. You will not be using it.
/ Manne