Fuel pump question

[mainermikeyd]

Since the beginning of the spring I have started havin problems starting my 82 k20. 2 years ago I replaced the mechanical fuel pump on my 350 with a NAPA one has three ports as the original one had, one from the tank, one to the carb, an the last one was an is plugged(fuel return line I'm thinking), my question is am I having a vapor lock problem?? If I spray carb cleaner in the carb BAM she fires right up an stays running. I have a 2 port fuel sending unit do I need to install a 3 port to hook up the fuel return line, or is one issue not related to the other???