Notice:
The advice given on this site is based upon individual or quoted experience, yours may differ.
The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.
Before you spend money, try priming the pump. Pull one of the hoses off the back of the pump mechanism. Put your hand over it and make a few pumps. That should draw the water in for priming. You might have to do this once in a while if you sail and don't use the head for a while.
Notice: The advice given on this site is based upon individual or quoted experience, yours may differ. The Officers, Staff and members of this site only provide information based upon the concept that anyone utilizing this information does so at their own risk and holds harmless all contributors to this site.