Well I have resolved my issue by calling Yamaha customer service. The published service schedule for 4 strokes, which is fairly generic, states that every 300 hours fuel pumps (diaphragm style) are to be inspected/replaced. The guy on the phone confirmed that I have electric fuel pumps and he recommended only inspection every 300 hours. I'm not sure which of the motors the service schedule was referring to have diaphragm style pumps, but its just the generic Yamaha 4 stroke published one. I'm guessing older ones? In any case I should be all set.