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Old 01-09-2021, 07:58 PM   #1
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Default bilge pumps

are all bilge pumps the same i have a 99 maxum 2400 that im rebuilding. i need 2 bilge pumps and unsure what brand to buy
any recommendations?
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Old 01-09-2021, 09:51 PM   #2
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Maybe not so much a brand name but how many gallons per hour it can handle. A 4000 gph is a whole lot better than a 1500 gph....

Roger
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Old 01-09-2021, 11:53 PM   #3
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As Roger said the higher the gph the better. There may be a limit based on the discharge hose size you have unless you are ok with going to a larger diameter hose which will require a larger thru hull.
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Old 01-10-2021, 08:39 PM   #4
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Rule brand or Johnson Pumps both have good reputations. (I have both on the 3000)
Pump capacities are always misleading unless you look into the conditions the rate was based upon. This includes the head, or distance the pump has to lift the water and the hose diameter.

I believe in a dual setup, with a smaller pump located low in the bilge for normal dewatering, with a larger high capacity pump mounter slightly higher for emergency situations. Two Johnson 750’s handle the smaller pump duties in the mid bilge and the ER. Large pump for the mid bilge is a Rule 2000 and a Rule 3700 for the ER.
All have Rule float switches and are hardwired (with fuses) to the batteries.
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Old 01-10-2021, 11:57 PM   #5
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most pumps i see are 3/4. would i be dumb to attach an enlarger fitting from the pump 1 1/8" to the existing 3/4 thru hull? i guess im just being lazy..lol ill go to the 1 1/8 thru hull
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Old 01-11-2021, 12:56 AM   #6
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Quote:
Originally Posted by 99maxum211 View Post
most pumps i see are 3/4. would i be dumb to attach an enlarger fitting from the pump 1 1/8" to the existing 3/4 thru hull? i guess im just being lazy..lol ill go to the 1 1/8 thru hull
Reducing the output will cause reduced flow and back pressure. If you use the bigger hose with the reducer right at the through hull the negative impacts will be much less then the reducer at the pumps output.
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Old 01-11-2021, 12:57 AM   #7
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I'm changing everything...I got nothing but time
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Old 01-11-2021, 01:04 PM   #8
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Matching the diameter of the hose to the pump outlet has been my rule of thumb. If the engineers who designed the pump decided on specific size, I figured they knew more than me. I did change out all the cheap ribbed plastic hose for smooth bore hose. I figured that wouldn’t hurt. Less drag and lower potential for a clog.

Since these pumps are built for volume, not pressure, lowering the resistance also helps to get the most out of the pump.
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Old 01-11-2021, 07:27 PM   #9
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Quote:
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Matching the diameter of the hose to the pump outlet has been my rule of thumb. If the engineers who designed the pump decided on specific size, I figured they knew more than me. I did change out all the cheap ribbed plastic hose for smooth bore hose. I figured that wouldn’t hurt. Less drag and lower potential for a clog.

Since these pumps are built for volume, not pressure, lowering the resistance also helps to get the most out of the pump.
Correct, the turbulence created by a ribbed hose decreases flow.
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