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Old 15-09-2020, 12:47   #16
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Re: Bilge Pump Advice needed

Speaking from experience as I also have a deep bilge (about 3ft to sole) I found that anything less than a 2000g/hr centrifugal pump was useless. The head pressure plus pipe resistance was such that smaller pumps were not able to lift any water effectively. This may be your problem and the solution is a different type of pump that has a high head and small volume at the pickup end.
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Old 15-09-2020, 14:01   #17
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Re: Bilge Pump Advice needed

The problem is not the switch, it is the water running back into the bilge. A proper check valve immediately after the pump should stop that. By proper I mean like those sold by Whale, not the brass ones found in plumbing stores that can slowly let the water leak back.

The best approach for dewatering is to use a diaphragm pump with a foot valve (check valve built into the pickup strainer). I just bought one of these for exactly the same purpose: https://www.whalepumps.com/marine/pr...dlyID=Bilge-IC

As long as there is even a small amount of water entering the bilge, from drips at the shaft or elsewhere, it will never completely dry out. Get over it...

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Old 15-09-2020, 14:10   #18
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Re: Bilge Pump Advice needed

My bilge has never had less than 2-3" of water in it...what is the problem?
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Old 15-09-2020, 17:01   #19
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Re: Bilge Pump Advice needed

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My bilge has never had less than 2-3" of water in it...what is the problem?
Some people believe trapped water in the bilge exacerbates or contributes to blistering. I'm less concerned about that then the odor it promotes. I'm trying to eliminate as much ingress as possible and have it as dry as possible as a matter of good boat hygiene and upkeep.
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Old 15-09-2020, 17:11   #20
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Re: Bilge Pump Advice needed

Back from the bilge. Seems the problem was the sensor mounting tab is connected internally to the sensor-water hitting the tab can set it off. I raised it a schooch and the pump now works the way it should. However...now the check valve I purchased at the plumbing supply store randomly gets stuck closed. I do think a 1000 GPH pump might be too weak for this application. Have very little faith in this arrangement. thinking a remote mounted diaphragm pump is the way to go.
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Old 15-09-2020, 17:21   #21
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Re: Bilge Pump Advice needed

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It shuts off then starts back up again and runs continously no matter how little water remains.

Then either you have it wired wrong or it's defective. They aren't supposed to do that.
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Old 15-09-2020, 18:39   #22
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Re: Bilge Pump Advice needed

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My bilge has never had less than 2-3" of water in it...what is the problem?
For some reason, I like any water, even a drop to stay out of the boat. My bilges are dry as a bone 🦴
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Old 15-09-2020, 19:17   #23
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Re: Bilge Pump Advice needed

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For some reason, I like any water, even a drop to stay out of the boat. My bilges are dry as a bone 🦴

Kind of feels like if the bilge is always sloshing with water minor problems can go unnoticed until they are no longer minor. Itís an individual preference of mine
YMMV
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Old 15-09-2020, 19:35   #24
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Re: Bilge Pump Advice needed

A few ideas:

I've found the water witch switch to not be as reliable as the marketing claims. The only switch I use is the Ultra. Expensive but they never have problems.https://www.ultratef-gel.com/product...nior-2432volt/

The diaphragm pump is a good idea but will still leave you with water in the bilge. The Whale Gulper is the one to get. Be sure to get a strainer on the end of the hose or the hose will clog.

Since the pump you have now is only for nuisance water, you don't really care about GPM. Step the hose down from 3/4" to 1/2" and take out the check valve. There will be much less weight of water in the hose to pump uphill or to run down hill after it turns off. It will still pump enough to do its job.

I've never had a dusty bilge in 40 years of owning cruising boats and it's never caused a problem. If you want to keep humidity down in the boat - ventilation is more important. I mounted a Noctua 12v computer case fan as an exhaust fan for the engine space. It's left on continuously. Draws 1 watt and is almost silent.
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Old 15-09-2020, 22:36   #25
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Re: Bilge Pump Advice needed

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Move the switch an inch higher.

You do not get an award for having a dusty bilge. If you care enough you can vacuum it out with a wet-dry vac before the Bilge Committee arrives for an Inspection.

Great answer. I'm wondering what is the need to have a completely dry bilge when it is very deep anyway.

I installed a Y valve on my shower diaphragm pump, which is manually switched as needed, no float necessary since we don't use a shower sump. The Y valve can be set to make the same pump suck water from the bilge, down to about 1/2 inch. I hardly ever bother.

Seriously, I don't know why boat makers don't add a small sump area of the bilge that is about 4" deeper than the rest, and big enough for a strainer.
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Old 16-09-2020, 04:07   #26
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Re: Bilge Pump Advice needed

How about a hump in the hose that is close to the pump so that the longer section of the hose is below the hump and the hose portion with the residual water is smaller.
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Old 16-09-2020, 05:08   #27
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Re: Bilge Pump Advice needed

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Originally Posted by jpendoley View Post
Back from the bilge. Seems the problem was the sensor mounting tab is connected internally to the sensor-water hitting the tab can set it off. I raised it a schooch and the pump now works the way it should. However...now the check valve I purchased at the plumbing supply store randomly gets stuck closed. I do think a 1000 GPH pump might be too weak for this application. Have very little faith in this arrangement. thinking a remote mounted diaphragm pump is the way to go.

I think that the centrifugal pump just won't cut it, regardless of the size. To remove the last bits of water, you need a diaphragm pump. A diaphragm pump is a positive displacement pump, and will pump any fluid, including air. Couple that with a strainer such as the one below, and a system to keep the pump running for several seconds after the low set point, and you should get as much water as is physically possible out of your bilge. Your water witch switch would be able to do the latter.

https://www.defender.com/product3.js...4256&id=157440

One last point, you are not trying to remove large quantities of water with this pump. Keep your suction hose fairly small diameter, I'm thinking no more than 3/4 inch. This will also reduce the volume of water that may leak past your check valve and flow back to the bilge.

Cheers!

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