Re: Jeanneau Attalia
You should have an emanual pump assuming where mine is on the aft side of the head wall. The Y valve is then opened to discharge overboard vs putting shyte in the tank.
That is how it is supposed to work any who.
You could also have some older hoses, after a while the hose does not contain the smells. So one needs to replace them after a period of time. For this hose, higher more expensive hose is WELL worth the extra $$$.
She drives me boat,
I drives me dinghy!