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  #11  
Old 11-28-2012
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Re: Rule Bilge Pumps

Okay, so I am looking at the diaphram pumps and wondering why they put out so much less water but costs so much more?
Also, what model should I get for my boat? how many gpm is acceptable?
Jabsco 36600 Diaphragm Bilge Pump? 475 gph
ITT Jabsco 372020000 ? 4.5 gpm
They just seem to pump so much less water...
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Old 11-28-2012
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Re: Rule Bilge Pumps

The Jabsco 3720 number looks like an impeller pump, ie a typical RWC pump as opposed to a bilge pump... 4.5 gpm = 270 gph, quite a bit less than the 36600..

As to what's acceptable.. how big a hole do you plan to put in your boat??
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  #13  
Old 11-28-2012
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Re: Rule Bilge Pumps

I just want to have a good bilge system for safety sake. Because of my shallow bilge I cannot do a normal set-up.
So, going the diaphram pump route, what should I get? Just tell me and ill buy it lol. Is the 36600 good enough> Should I go up one more? I just need a yes or no from those with the knowledge I seek.
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Old 11-28-2012
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Re: Rule Bilge Pumps

Would you buy a utility pump from Harbor freight?
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Old 11-28-2012
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Re: Rule Bilge Pumps

I wouldn't buy anything I had to depend on from HF.
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Re: Rule Bilge Pumps

Quote:
Originally Posted by Harborless View Post
I just want to have a good bilge system for safety sake. Because of my shallow bilge I cannot do a normal set-up.
So, going the diaphram pump route, what should I get? Just tell me and ill buy it lol. Is the 36600 good enough> Should I go up one more? I just need a yes or no from those with the knowledge I seek.
Have you contacted the tech service departments at Rule or Whale and asked them for their recommendations?
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Old 11-28-2012
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Re: Rule Bilge Pumps

No, but I will. I thought it was a pretty straight forward diy but now I suppose I need to call the sperts
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Old 11-28-2012
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Re: Rule Bilge Pumps

Diaphragm pumps just cost more, a lot more. There are more moving parts on a diaphragm pump than a centrifugal pump like a Rule. You could buy 7 (or more) Rule pumps for the price of one Jabsco 36600 pump.

How much water are you expecting to need to pump out of your 2" deep bilge? You don't need much more than a 500 gph pump to empty a few gallons of water now and then.

Since I have had two (2) Jabsco diaphragm pumps fail on me I do not recommend using them.

Is there some spot on your cabin sole (floor) where you can cut away a hole where you could insert a Rule pump into the bilge?
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Old 11-28-2012
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Re: Rule Bilge Pumps

For maintenance pumping you do not need high volume.

As an example (excuse the very rough math): My bilge pump switches on once every 2 days or so, runs about 30 secs, rated at 650gph. If I put a 65gph pump in there it would run ~5 mins every 2 days. no big deal even at the worst case.

In your case you are very height constrained. Caleb's idea, to cut a hole in the cabin sole for a small Rule pump, is a good one. However if that is not an option, it seems that you can eliminate the possibility of an inexpensive impeller pump. In that case it seems you are stuck with the more expensive remote diaphragm pumps, of any capacity (assuming this is just maintenance pumping) you can find.

For the record though I never feel comfortable with just one pump. In the bilge I have 2 automatic pumps (small Whale supersub, a large rule mounted higher in the bilge)

So whatever you go with, consider going with two of them.
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Old 11-28-2012
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Re: Rule Bilge Pumps

The problem I see is even if you use a diaphram pump with only 2 inches it will not work well. While sailing the suction line will be dry many times and the float switch will not work well with those close tolerances. Even at dock two inches is not much. You will need to have the suction line vertical, not horizontal, and it does not seem that will work for you.

I think you need to look at other options to your bilge.
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