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Old 05-26-2020, 07:20 AM   #1
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Pump on new flying cloud makes hideous noise

Water is coming to all the outlets when we are off city water and using freshwater tank but pump is making rumbling knocking sounds. Is brand freaking new!
What gives?
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Old 05-26-2020, 07:25 AM   #2
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First locate your water pump and make sure that it is mounted firmly, with some type of rubber isolator between the pump and trailer. A lot of folks find that the pipes are making the noise, so they kust put some pipe foam insulation material around the pipes where they come in contact with the trailer. Good luck.
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Old 05-26-2020, 07:38 AM   #3
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Greetings from the Florida Panhandle

RV water pumps are just that way sometimes, brand new or not. I have found that in the long haul fresh water pumps will get noisy and quiet down again. Most likely, there is nothing wrong with the pump. Try putting your hand on the pump while running. That will tell you if you need either tightening or more insulation under the pump.

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Old 05-26-2020, 07:42 AM   #4
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Welcome to the hobby! They are noisy. Mine sounded like someone drilling through the wall then I got a silencing kit and it made a huge difference. I you use the water pump much, it is worth it.
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Old 05-26-2020, 08:36 AM   #5
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The pumps are generally mounted to the plywood floor with just a small rubber foot for vibration isolation. As it vibrates it can use the floor like a drum to amplify noise. I ended up cutting up one of those $2 dollar flat dense foam kneepads, the kind sold at the garden center and mounting the pump on top of that. It helped quiet it down a lot.

As mentioned above too you might find some pipes are vibrating against the wall. Usually the first few feet downstream of the pump. Secure them and the noise should mostly go away. It will never be dead quiet due to the design of RV water pumps, but should not be offensive.
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Old 05-26-2020, 09:36 AM   #6
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You may have air stuck in the lines. Here is link to how to clear the air from your lines. https://youtu.be/UhVLMjnEUlc .
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Old 05-26-2020, 09:37 AM   #7
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In case you are running the water pump while you are connected to city water, don't do that. City water is already pressurized. In fact, in some campgrounds it is important to have a water pressure reducer in-line in order not to expose your tubing in the trailer to excessive pressure and perhaps blow a junction apart.
The water pump is only for pumping water from your fresh water tank when the trailer is not connected to city water.
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Old 05-26-2020, 10:27 AM   #8
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We had the same noise. Took our FC back to the dealer and the tech wrapped the line with foam tape to secure it. Problem solved!
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Old 05-26-2020, 10:29 AM   #9
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Quote:
Originally Posted by MaineStreamer View Post
In case you are running the water pump while you are connected to city water, don't do that.
. . .
Hmmmm . . . not a hard and fast rule Marty IMO.

Some AS owner's manuals actually say to turn on the pump if the city water pressure is low.

https://www.google.com/search?q=pump...=airforums.com
https://www.airforums.com/forums/f44...er-190825.html
https://www.airforums.com/forums/f54...re-197714.html


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Old 05-26-2020, 12:10 PM   #10
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I added an accumulator to my system, near the pump, it’s a very small pressure tank, now is is practically noiseless. IMO this is the best solution, and a upgrade!
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Old 05-26-2020, 12:38 PM   #11
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Quote:
Originally Posted by Jmackair View Post
Water is coming to all the outlets when we are off city water and using freshwater tank but pump is making rumbling knocking sounds. Is brand freaking new!
What gives?
Hi Jmackair,*

We're very sorry to learn about the issue you are having. Please send us a direct message with your contact information, email and the last 6 digits of your VIN so we can share it with our Customer Service and Technical Support team. We look forward to helping you get this resolved.

You can also reach Airstream Customer Service and Technical Support at*customersupport@airstream.com

Thank you.*
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Old 05-26-2020, 01:17 PM   #12
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Your system needs a head of air n the hot water tank. If it is not there it will cause a water hammer. It can be restored be letting water out of the tank through the pressure relief valve at the top of the tank. Be careful if the water is hot.
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Old 05-26-2020, 01:34 PM   #13
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My 2018 Classic 33 has a factory installed Shurflo Water Pump. The manufacturers installation instructions for the pump state not to connect rigid piping/tubing to the pump.
The factory connects the system PEX tubing to the pump which is one of the main causes of the noise you describe. Install a Shurflo Silencing Kit (flexible hose sections) which will reduce the noise significantly.
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Old 05-26-2020, 01:36 PM   #14
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Quote:
Originally Posted by Jmackair View Post
Water is coming to all the outlets when we are off city water and using freshwater tank but pump is making rumbling knocking sounds. Is brand freaking new!

What gives?


Just from my experience, my pump makes a great deal of noise when the tank is close to empty. Normal pump sound when it is not getting close to empty.

I would rule that out first by completely filling the fresh water tank.
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Old 05-26-2020, 04:04 PM   #15
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Also check under the sink for pipes vibrating and causing noise when the pump runs. Easily fixed. Ask me how I know
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Old 05-26-2020, 09:42 PM   #16
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2nd the silencing kit

Quote:
Originally Posted by rodsterinfl View Post
Welcome to the hobby! They are noisy. Mine sounded like someone drilling through the wall then I got a silencing kit and it made a huge difference. I you use the water pump much, it is worth it.
Spot-on post there rodsterinifl; welcome to the hobby! At least your pump makes noise - our first AS was a 2018 FC23FB. Turned on the pump and... crickets! Being the inquisitive guy I am (plus didn’t want to tow the trailer back to the dealer) I poked around until I found the pump. The 12V lead to the pump was laying on the floor.

Pentair, the manufacturer of the pump states in the installation manual the pump should not be connected directly to rigid pipe or it will transfer vibration and noise. Airstream does exactly that - connects with rigid pipe. Pentair has a “silencing kit” that consists of two flexible hoses to connect the inlet and outlet lines to the trailer.

Installing them will definitely quite it down but you can do what other posters have suggested by making sure the pump is mounted securely and no pipes are touching solid surfaces. Slip some insulating pipe foam around any that are close to each other or touching. You can always do the silencing kit later if you’re still dissatisfied. Adding the accumulator will also help.

Welcome to the club (and hobby)!
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Old 05-30-2020, 08:02 AM   #17
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Thanks Jeff, home in CLT now, parked in driveway, working on it ...
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Old 05-31-2020, 12:54 PM   #18
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Probably air in the lines somewhere. I run cold and hit through each faucet including outside. Usually when I get the air pocket out it runs smooth
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Old 06-01-2020, 09:20 PM   #19
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Could just be a loose connection in the pvc pipe?...My pump sounded so loud on my New 2016 Flying Cloud bunkhouse from day 1 but I assumed that was normal until after 3 years it wouldn’t prime. I stopped at an Airstream dealer in Florida while traveling to find out why. I watched the technician put a loose pvc pipe located in the wall between the bathroom & kitchen back into its fitting & not only did the pump prime but the loud knocking sound was gone! Hope ur problem is that simple!
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