Midship bildge pump pumping into shower
My 2000 FV242 has a midhsip bildge pump and a shower sump under the stairs that seem to use the same overboard through hull. If the bildge pump kicks on, it pushes the water up through the shower (bathroom floor) drain until the bildge pump shuts off. It then slowly drains back into the bildge through the bildge pump and starts the proccess again, over and over. If I use a shop vac on the outside of the through hull when there is water in the shower, it will pull water out, and then the shower drain sump kicks on when ever water goes down the drain with no issues, until the bildge pump kicks on, and the process starts all over. Anyone have any ideas?