Randy
Are all your questions about the 120 or are the problems the same with the non pumped engines as well? It sounds like you have dirt or gum in the pumps of the 120s. To start with you need to try pumping fuel through the pumps with out going to the carbs by hooking up a tank to the pump with the output line going back to the tank. It should pump by just rocking the prop back and forth to clean out any fuel residue or hopefully any dirt. If it wont pump it may have to be dis assembled to find the problem.