Re: [Amel Yacht Owners] Electrial bilge pump SMM 2000

Anne and John Hollamby <hollamby@...>

I had tis problem on Bali Hai SM 319. The flap valves in the bilge pump are
or were a simple piece of rubber or plastic. The reason why the problem
occured was that I sometimes used the bilge pump on manual and the effect
is to eventually pump air through the pump so that there is no water
resting on top of the flaps to hold them shut. The moral is to avoid the
manual option as the foot of the Electric pump is not at the bottom of the
sump. To totally drain the sump use the manual pump which does go down to
the bottom.
The manufacturers have now improved the flaps by increasing the thickness
where it matters to aid gravity and perhaps avoid the flap curling upwards
when there is no water above it. I got some of these new flaps in a service
kit ( which was ridiculously expensive) but have not had to install them
ever since I stopped using the manual option about a year ago.
I suppose there wouyld be no problem if the manufacturers copied the flaps
in Whale/Henderson pumps which are made with a metal insert to solve the

Happy manual pumping ! John Hollamby

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