[Bice0004]

Which pump are you referring to, the shower pump or shower sump pump? In my 88 3100, the shower pump is run off the fresh water system and the pump is located in the engine compartment on outboard wall area. Otherwise the shower sump pump is located in the engine compartment behind the bulkhead and in front of engine closest to the shower depending on your layout with bathroom on port or starboard. My layout is bathroom on starboard and the sump pump is on other side of bathroom bulkhead in the engine compartment in front of starboard engine with drain hose running through bulkhead to pump.