Join Date: Apr 2012
Location: Houston, TX
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My holding tank is inflating!
I have a 1984 Starwind 27 -- pretty similar to a Catalina 27. The head system seems very normal. A thru-hull feeds seawater to the toilet, which then pumps to a holding tank that has a thru-hull out (which has to be closed) and a hose up to the deck for pump-out. There is also a vent line off the top of the tank to a vent in the anchor locker.
Here's the problem. When I pump the toilet, and the holding tank is closed, it inflates and pressurizes the holding tank to the point that it finally blows air back through seals in the toilet, immediately filling the entire boat with a horrible stench.
I thought the vent line must have been plugged, so I replaced it and cleaned the vent in the anchor locker -- no change.
What am I missing?!!!