I just inherited a 1996 18 foot Bayliner Trophy. The pump in the fish well was not working so I replaced the cartridge with a similar or identical 500 gph Johnson. I cleaned the base and the tube. The pump turns but does not pump water. My question- is the pump supposed to pump water out of the well as I think or is it supposed to pump water into the well? If in to the well, I don't see a thru the hull fitting as an inlet. Anybody familar with this?