Replace the two O-rings on the pump plunger using the same method as the previous O-rings.

Replace the outlet cap O-ring using the same method as the previous O-rings.

Re-assemble the pump by using these instructions in reverse.

Remember to not allow the thin bump stop O-rings to get caught in the threads of the pump body.

It is a good idea to apply a small amount of Loctite to the outlet cap during re-assembly to prevent the cap from vibrating loose.