There is nothing internally in that pump, other than a shaft, bearings and seals. Any oil will work. It's got plenty of cooling. I've used M1 gear oil in my SeaDoo's with excellent results. The pump is simply a carrier for an impeller.
The carb/s are diaphragm type and will likely need cleaning AND to have the pop off pressure set properly. (that's the most important thing you can do). It's really easy and getting it right makes a world of difference.
The fuel lines are a pain to change. Good luck.
Is the fuel shutoff valve stiff? If so, purchase a new one (new knob + screw) when you do the lines. They are cheap and having one fail is a pain.