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Old 30-01-2009, 07:53   #16
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Having just put in a new holding tank on Rhosyn Mor, this is what I did.
Holding tank is above the water line.
all waste goes into the tank. From the bottom of the tank the hose leads to a 1.5 inch manual pump ( Whale Gusher).
At the top of the tank is the pump out fitting ( 1.5 inch PVC pipe leads down to I.5 inches from bottom of tank and up to deck fitting)
1 inch vent fitting at top of tank leads out to just beneath toe rail.
It sems to work, and all the manual bilge pumps are the same, whixh allows for reapar underway.
hope this helps
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Old 30-01-2009, 08:49   #17
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If your holding tank is all above the WL, you can just open the seacock and gravity-drain the tank. You don't need that pump. . . . Can I have it? ;-)
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Old 30-01-2009, 10:20   #18
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Ha!
THere is a bend in the hose before it gets to the sea cock, and sometimes gravity needs a little push... I have no way of sunning a short direct hose to the seacock, but good try,
you might give Bacons in Annapolis a try they always have pumps in stock for a bout USD 30
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Old 30-01-2009, 16:34   #19
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Quote:
Originally Posted by Cormorant View Post
If your holding tank is all above the WL, you can just open the seacock and gravity-drain the tank. You don't need that pump. . . . Can I have it? ;-)
Cormorant, - That's exaclty the system I have on my boat and what is now standard on many of the Moorings Beneteau boats. Just open the Seacock and the tank empties by gravity feed. Simple.

The question I don't have an answer I don't have an answer to yet, is given the lower pressure of a gravity feed system, what diameter plumbing does one need to ensure thing will in deed drain. All the Beneteau's I've seen with this system have a discharge larger than the standard 1 1/2.

It's a good system though. I've been very pleased with it.
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