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Old 07-10-2016, 03:52 PM   #1
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On to the next issue - water pump noise

We just returned from a great 9 day trip. We discovered that when we use the water pump, it is incredibly loud(vibrating sounds that you can hear and feel) when we flush either of the toilets. However, when we use a sink or take a shower it virtually silent. My first thought was perhaps they had a separate pump for each system but there is no mention of that in the owners manual. It seems to me that it would operate the same regardless of where the water was going. Thoughts on a possible cause?
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Old 07-10-2016, 04:06 PM   #2
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My guess.. The shower and sink have a lower flow rate that the toilet. The toilet let's the pump run at its max.
Try running two sinks at the same time and see if that is the issue. Of course I don't have any suggestions to fix it but at least you would know.
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Old 07-10-2016, 04:26 PM   #3
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If your pump is plumbed directly to the PEX lines it can cause the noise and vibration. One solution is to get some high pressure flexible lines and use these between the pump and the PEX. It helps to put a loop in the line. Also. if your pump is mounted directly on the frame of the motor home it helps to put material to isolate the pump, a piece of heavy rubber works.
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Old 07-10-2016, 05:27 PM   #4
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I have 2 suggestions.... find the pump and put a piece of rubber mud flap between the pump and the floor its screwed to.... this will help silence it... and my second thought is to go out and buy a 2 gal pressure tank with a rubber bladder in it.... usually available at Lowes or Home Depot... mount this tank on the output side of the pump... this will create a pressure system of such and will help take some of the shock out of the system as the pump runs when very little flow is expected...
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Old 07-10-2016, 06:14 PM   #5
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Originally Posted by jelag View Post
I have 2 suggestions.... find the pump and put a piece of rubber mud flap between the pump and the floor its screwed to.... this will help silence it... and my second thought is to go out and buy a 2 gal pressure tank with a rubber bladder in it.... usually available at Lowes or Home Depot... mount this tank on the output side of the pump... this will create a pressure system of such and will help take some of the shock out of the system as the pump runs when very little flow is expected...
to both suggestions
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Old 07-10-2016, 06:48 PM   #6
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Originally Posted by jacwjames View Post
If your pump is plumbed directly to the PEX lines it can cause the noise and vibration. One solution is to get some high pressure flexible lines and use these between the pump and the PEX. It helps to put a loop in the line. Also. if your pump is mounted directly on the frame of the motor home it helps to put material to isolate the pump, a piece of heavy rubber works.
+1^

The softer, more flexible line will help isolate the pump's pulses from the rest of the plumbing.
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Old 07-11-2016, 06:58 PM   #7
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Unbolt the pump and suspend it with straps so no part of the pump touches the body panel. This eliminates pump vibration being transmitted up into the body.
An accumulator tank can help also. With just a small modification, your white garden hose can function as an accumulator tank.
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Old 07-11-2016, 09:24 PM   #8
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You could try to re-establish the air head in the water heater. Just relieve the pressure and open the pop off valve on the water heater. When it stops draining, close it up. When you use water the pump will run full speed until the presure is reestablished. For small amounts the pump won't have to start.

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Old 07-12-2016, 01:45 AM   #9
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Old 07-12-2016, 10:03 AM   #10
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Thanks for all the suggestions. I will check it out in the next couple of days. As for the silencing kit....that's quite a premium price tag for a couple of water supply lines!
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Old 07-12-2016, 10:38 AM   #11
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Thanks for all the suggestions. I will check it out in the next couple of days. As for the silencing kit....that's quite a premium price tag for a couple of water supply lines!
I agree but it is complete and you don't have to mess about trying to figure out what hoses to buy. A few bucks more and you save time in the home improvement store. In any case it is a good visual for someone to understand the problem.
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Old 07-13-2016, 12:35 AM   #12
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Had issues with pump noise as well. Moved pump from the coach frame mount, purchased a Lowes 7 gal horizontal pressure tank with a pump mounting flange on the top of the tank. Installed pump on top of the tank with flexible braided hose to the tank. Now the pump only cycles to recharge the tank and the noise level is greatly reduced. Fairly straight forward mod.
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