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.
You may need a new diaphragm or valve. Most rebuild kits cost around $15.00 to $20.00 depending on which one you have and can be found at West Marine or other marine stores.
Pr9iming would be my bet. I have a story to tell about a manual bp that had never been used. It was a different boat and we learned the hard way. Ity took a leather from a fishing harness to get it working-- but that was a "Big" boat and a blue water problem. Someday!
It's a long shot... but do you have a Y-valve? My manual bilge pump empties the bilge or the head holding tank, depending on the setting of the Y-valve.
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.