Garland Gray II wrote:

I figured the rubber valve at top of the pump could leak and bypass water.
And you are certainly right about the possibility of the lever being left in
the wet position. My old boat csme with no vented loop, and if someone was
careless, the water would nearly fill the bowl.

So it's safe to assume that you DID install a vented loop? Which, btw,
should NOT be installed in the intake line between the thru-hull and the
pump..it has to go between the pump and the bowl...to replace the short
piece of hose the mfr uses to connect 'em. There are
exceptions...electric macerating toilets--in which case it's necessary
to add an electric solenoid valve--and some very high end manual toilets
that have dual pumps and don't have that short piece of hose.
--
Peggie
----------
Peggie Hall
Specializing in marine sanitation since 1987
Author "Get Rid of Boat Odors - A Guide To Marine Sanitation Systems and
Other Sources of Aggravation and Odor"
http://www.seaworthy.com/store/custo...0&cat=6&page=1
http://shop.sailboatowners.com/books...ku=90&cat=1304