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MYO Owner and Founder
Posts: 2137
Home Port: Chesapeake Bay
IP Logged | I know this effects 411's and I suspect it may be a problem on other models as well. Check the hoses on your bilge pump through hulls. Is there a loop or do then run high before they get to the through hull? We kept getting a ton of water at the aft of the boat when on plane. It turns out that water was coming in through the aft bilge pump through hull!! On the 411 there is no loop in the hose from the aft bilge pump to the hull and the through hull is reasonably close to the waterline. In rough conditions, with 3/4 fuel and a fair amount of fresh water, running a little bow high... water would come pouring in, then the pump would dump it back out. Thats right, no loop in the hose. A friend with a 2006 411 had the same problem.
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Admiral
Posts: 1236
Home Port: Jersey City, NJ
IP Logged | You could easily add a check valve too. But the situtaion you just described will not sink your boat. |
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MYO Owner and Founder
Posts: 2137
Home Port: Chesapeake Bay
IP Logged | Check valves can reduce the water flow up to 50%. I want my bilge pump pumping at 100%. Check valves are a big no-no where bilge pumps are concerned. It could help sink your boat if your bilge pumps go bad. Bottom line, a loop is a must. |
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Admiral
Posts: 1236
Home Port: Jersey City, NJ
IP Logged | Point taken. I didn't realize that they reduce flow that much. |
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Deck Hand
Posts: 5
Home Port: Hampton, VA
IP Logged | Tracking down the water in my bilge has been driving me nuts! If it's coming in from the aft bilge pump there wouldn't be a trail to follow. I'll check this weekend, but good catch Yolo, thx. |
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Deck Hand
Posts: 32
IP Logged | Curious on the loop in the hose. Up,down or does it matter |
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Admiral
Posts: 351
Home Port: Cloverdale, CA
IP Logged | Sea Ray is starting to install check valves in some of their bilge pumps lines. I don't know how they deal with the restriction issue. I was told they had some boats taking on water through their bilge pumps and were afraid they could start a siphon and sink the boat. I have seen pictures of check valves in bilge pump lines in magazines, so the installation of check valves in bilge pump lines is becoming more common. |
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Deck Hand
Posts: 47
Home Port: sidney b.c.
IP Logged | Apperloo - 7/25/2010 8:20 PM
Curious on the loop in the hose. Up,down or does it matter
the loop would go upwards,,maybe 2' above the water line.. |
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Admiral
Posts: 442
IP Logged | I enjoy dumping water in my friends boats bilges when they are not at the marina.. I have several guys wondering where the water is coming from. They pump it out and dry the bilge and see no water intrusion anywhere. It's almost as good as the annoyatron. Oddly; someone stole my jetskiis a few weeks ago, well.. they were "repositioned".. I was dialing the insurance company when they gave up the ruse. Sure is entertaining on our dock |
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Deck Hand
Posts: 32
IP Logged | dyoung - 7/26/2010 8:37 AM
Apperloo - 7/25/2010 8:20 PM
Curious on the loop in the hose. Up,down or does it matter
the loop would go upwards,,maybe 2' above the water line..
Thanks
Thats enough to break the syphon I suppose
(Couple of those diesels would be nice .....
Edited by Apperloo 7/27/2010 9:35 PM
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Admiral
Posts: 417
Home Port: Longboat Key, FL
IP Logged | I can't wait to check this on my 441 as well. Every time we go out for an cruise in open water we end up with a few inches of water in the aft bilge. Not enough to warrant concern, but I've never been able to figure out where it comes from. Unfortunately, the aft bilge pump is located behind and under the generator so tracing this back will require some gymnastics. |
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Captain
Posts: 142
Home Port: Seattle, WA
IP Logged | I have this same issue on my 411 and plan to tackle the fix as one of my next projects. There appears to be plenty of room to go higher. Should I just take it higher or should I also add a loop? (note: my plan is to replace the entire hose with a longer one, not try to lengthen the existing hose)
Also, there is some type of sealant stuff on the end of the hose where it connects to the thru-hull. What type of stuff is this so I can be sure to use some when I put the new hose on?
Thanks! |
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Admiral
Posts: 417
Home Port: Longboat Key, FL
IP Logged | I finally climbed around the generator on my 441 to reach the aft bilge pump and was pleased to find the hose runs up to the main drain system on the port side. As a result, there's no way for the water to "backwash" into the bilge from the outside.  |
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Captain
Posts: 142
Home Port: Seattle, WA
IP Logged | I installed a longer bilge hose today on my 411. I now have a loop that added 14" of height. If you want to do this, you'll want to get Teleflex Multiflex Series 141 hose, 1-1/8" inner diameter. My local West Marine carries this series of hose, but did not have the 1-1/8" size. However, I was able to order it from the West Marine web site. You'll want to get about 15'. I ended up cutting off about 2'. My original routing was about 9' or so.
You'll also want to get a pack of mountable cable ties (i.e. zip ties that have a hole at the top so you can mount them with a screw). Lastly, you'll want some sealant for when you attach the hose to the pump and the thru hull.
My boat needs to be underway (i.e., bow up) for the water to accumulate in the aft bilge area, so I'm hoping to test things tomorrow when we cruise to Bremerton for the Blackberry festival.
Anyway, for those that want to do this, the Teleflex Multiflex Series 141 hose was an exact match. |
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Water in your bilge? Read this!
