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----- Original Message -----
From: "Roger Martin" <>
To: "M. Schmuck" <>
Cc: <>
Sent: Sunday, September 02, 2001 4:31 PM
Subject: lv-ab: Raw-water pump-vented loop
> At 10:44 PM 8/31/01 -0400, you wrote:
> >
> >The raw water pump is mounted high on the front of the engine. The water
> >comes from the sea-cock, through the filter into the pump. Cant have an
> >anti-siphon there.
>
>
> I also have an unvented raw-water intake and have had to close the
> seacock every time I shut down the engine to insure against water ingress.
> I am interested in your question, but why you couldn't have an anti-siphon
> between the seacock and the water pump? Is it a space problem?
No it's not a space problem. The pump sucks water through that hose. The
anti-siphon valve will open, suck air and the pump will loose its prime. The
anti-siphon closes when there is pressure in the hose.
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