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Old 06-25-2014, 09:58 PM   #1
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Noisy fresh water pump

My house fresh water pump is mounted under the master headboard. When the pump kicks on, it's quite noisy. It works fine, but it's noisy. It's a plastic diaphragm pump, ~5 gpm, 2 years old, par max or something. It's mounted to a plywood support with rubber bushings. Is there a way to quiet this down? Or do I have to get a different pump, and if so, what is recommended?
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Old 06-25-2014, 10:27 PM   #2
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Belt drive or direct drive?
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Old 06-26-2014, 12:24 AM   #3
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Check out this thread:

Quiet fresh water pump?
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Old 06-26-2014, 12:58 AM   #4
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If you hear it over the engine(s)' noise, you have a problem.
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Old 06-26-2014, 10:23 AM   #5
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Replumb and move the pump to a different location. You could added a accumulator tank so the pump does not come on so often.
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Old 06-26-2014, 03:12 PM   #6
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If you can't move it and assuming it's working correctly, remount it on some hose to isolate it even more and then make a box for it to cut the noise.
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Old 06-26-2014, 06:20 PM   #7
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The plywood amplifies the sound and vibration of the pump just like a guitar body amplifies the vibration of the strings.

Unless you're willing to try some of the other suggestions posted above, try to isolate the pump from the mounting surface and if the plywood is mounted to the boat, isolate it as well. If you can cut the plywood down to a smaller size this might also help to quiet the noise.
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Old 06-26-2014, 08:16 PM   #8
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It is not clear from the question whether the 2 yo. pump was quiet and became noisy, or was always noisy. Sound proofing may fix the latter, but if it become noisy, the pump itself has an issue.
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Old 06-26-2014, 09:06 PM   #9
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It's a direct drive, about 2 years old. It can't be heard above the engine, but if get up before my wife, so if I've used the water for coffee, brush my tooth, etc., it might come on and at 0600 it's pretty damn noisy! I'm going to trying to isolate it with hose as a start and see where it goes. Thanks all, for the help
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Old 06-26-2014, 09:21 PM   #10
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Some people mount them on sections of vinyl sanitation hose to eliminate some sound/vibes.

A small insulated box cover would cut down even more as well as an accumulator unless one of the new variable speed type pumps...sometimes if you don't have a real flexible section of hose directly attached to the pump...sound is transmitted up the water lines.

If the pump is covered...it does need air flow and enough cooling.
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Old 06-26-2014, 11:44 PM   #11
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Clearly hear my pump when engine is silent. No problem since my sweetie arises from bed before me, and it reminds me I'm on a boat.

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Old 06-27-2014, 09:02 AM   #12
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It is common, as said above, to mount on some hose. Small sections of soft hose are attached to the pump mounting points then the hose att ached to the ply thus isolating the mechanical vibration. The noise of the pump will require something else.
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