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Old 03-09-2012, 11:59 PM   #1
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12v Water Pump vibrates bad when water is on...

12v Water Pump vibrates bad when water is on...is this normal? Vibrates so much when you turn on the water on you can feel it in the floor. Very annoying, and makes me think something is going to rattle loose. This is on my brand spanking new Coachman 271BH. Thanks.
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Old 03-10-2012, 12:16 AM   #2
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Very likely the pump has worked loose or wasn't mounted down to start with. Easy fix. :-)
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Old 03-10-2012, 03:55 AM   #3
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The instruction say to not tighten the pump mounting screws too tight or it will transmit the vibration to the mounting surface. Try loosening them till it just keeps the pump in place. Sometimes the pipes touch the surrounding structure and can cause noise and vibrations.
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Old 03-10-2012, 07:35 AM   #4
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If its mounted solid then that's normal. You will need to get some rubber mounting feet to isolate from the wall. These pumps are noisy by nature. Also make sure the piping attached to the pump is not touching a wall near the pump.
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Old 03-10-2012, 08:56 AM   #5
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All the Shurflo pumps I have ever had come with rubber mounting feet to isolate the noise and vibration from the RV.

NOISY OR ROUGH OPERATION:
Check For plumbing which may have vibrated loose.
Check For a restricted inlet (clogged strainer, kinked hose, restrictive valves).
Check Is the pump plumbed with rigid pipe causing noise to transmit?
Check Does the mounting surface amplify noise (flexible)? Does it bang like a drum?
Check For mounting feet that are loose or are compressed too tight.
Check For air in the system. Check all fixtures for air and bleed system.
Check The motor with pump head removed. Is noise from motor or pump head?
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Old 03-10-2012, 09:15 AM   #6
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We had a trailer that the pump was very loud in and I checked the rubber mounts, all seemed to be attached correctly.

Decided to just live with it.
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Old 03-10-2012, 09:25 AM   #7
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My 5er had the pump under the sink and was noisy too. I put some hi-density foam rubber under it and it helped.
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Old 03-10-2012, 10:02 AM   #8
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First off, I have nothing good to say about Shurflo water pumps. They are problematic to begin with.

However to solve your immediate problem, your pump should have rubber grommets on each of the mounting holes that should cushion the pump mount to the wherever the pump is mounted in the bay. Second, you should install a Pulsation Damper hose between the output side of your pump and the rigid PEX tubing. Also make sure that the PEX tubing is held securely to the wall of the bay, otherwise the PEX tubing will be vibrating and transmitting that noise throughout the RV. i chose to use SS water supply tubing for my Pulsation Damper hose.

I removed a section of the PEX tubing and installed a compression PEX to 1/2 inch male FPT fitting. Then installed the Pulsation Damper hose between the pump and the new fitting.

Regarding pumps, I am a proponent of the Aqua-Jet 10 amp high output RV water pumps. The OEM one I have incidentally was just removed as it was going on 11 years old but still working, and I installed a brand new Aqua-Jet. The new one works even better than the old one. I now have a backup unit in case I ever need it. I have an upcoming 5 week trip to Alaska from Florida where we will be spending the summer. I did NOT want to have any water pump problems and hopefully I won't but if I do, I have one to put in and it only takes 5 minutes to replace it.

See photos.

Dr4Film ----- Richard
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Old 03-10-2012, 11:27 AM   #9
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I must be lucky. I've been RV'n for over 17 years and other than having to clean the calcium out of one of the pumping diaphragms, I have never had one go bad.
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Old 03-12-2012, 06:36 PM   #10
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There are two components to this, isolation of the pump mounting and the best way is with a bubble mount i.e. Bubble Mounts - Vibration Isolators and Shock Mounts and the second and lesser component is using hoses rather than rigid pipe.
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Old 03-14-2012, 09:15 AM   #11
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Thank you all for the advice, I'm going to dive into this over the weekend!
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Old 03-30-2012, 10:02 PM   #12
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My simple solution, was to cut a piece of rug about 12" x 6" I then folded it to where the backing was together and put 4 screws through the pump's mounting base and through the rug. We could barely even hear the pump after that.
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