--- In amelyachtowners@..., Anne and John Hollamby
I had tis problem on Bali Hai SM 319. The flap valves in the bilgepump are
or were a simple piece of rubber or plastic. The reason why theproblem
occured was that I sometimes used the bilge pump on manual and theeffect
is to eventually pump air through the pump so that there is no waterthe
manual option as the foot of the Electric pump is not at the bottomof the
sump. To totally drain the sump use the manual pump which does godown to
where it matters to aid gravity and perhaps avoid the flap curlingupwards
when there is no water above it. I got some of these new flaps in aservice
kit ( which was ridiculously expensive) but have not had to installthem
ever since I stopped using the manual option about a year ago.flaps
in Whale/Henderson pumps which are made with a metal insert to solvethe
problem.It is a good explanation, but I had never used the manual on switch
for the electric pump. I was and still am pumping the bilge "dry"
almost every day with the hand pump.