Water Pump noise - normal? - Fiberglass RV


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Old 07-08-2013, 06:28 PM   #1
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Water Pump noise - normal?

Hi - I am a new Scamp 16' SD owner (new Scamp, purchased new in March) and we LOVE IT. So far, so good... but I am curious about the noise the water pump makes and am wondering if the lines have air in them? The first time we used it we were hooked to city water and I do not remember it making this noise (whoooomp whooooomp whooooomp), but since then, when using only the freshwater fill in - it makes this noise every time you turn the water on, and the water is not really flowing freely, it's more of a irregular flow. Is this normal? I also noticed this past weekend when we were completely off-grid that when I turned the water on the light over the sink dimmed a bit. Any advice or just a "relax, this is all normal" comments are very appreciated.
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Old 07-08-2013, 07:27 PM   #2
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Hi Michelle, the only advice I can give you is you don't use the water pump when you're hooked up to city water. It becomes on demand.

Anyone else have any advice for Michelle?
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Old 07-08-2013, 08:47 PM   #3
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Donna's correct. The water pump is used when you are pumping water from the fresh water tank only. City water is forced in on demand with pressure, not through the water pump. It does make a noise. And if you were only using 12 volt when "Off Grid", it can dim the lights a bit when using the water pump. Things like that are normal and come with experience. Make sure you keep the battery filled with distilled water and charged;( Also if you have a dehumidifier; the water collected in the container is also distilled when it's passed through the dehumidifier unit). Saves a little money instead of having to buy the water.
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Old 07-08-2013, 09:19 PM   #4
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Quote:
Originally Posted by tastebud View Post
Hi - I am a new Scamp 16' SD owner (new Scamp, purchased new in March) and we LOVE IT. So far, so good... but I am curious about the noise the water pump makes and am wondering if the lines have air in them? The first time we used it we were hooked to city water and I do not remember it making this noise (whoooomp whooooomp whooooomp), but since then, when using only the freshwater fill in - it makes this noise every time you turn the water on, and the water is not really flowing freely, it's more of a irregular flow. Is this normal? I also noticed this past weekend when we were completely off-grid that when I turned the water on the light over the sink dimmed a bit. Any advice or just a "relax, this is all normal" comments are very appreciated.
Some noise is normal and the surge should go away once the lines are filled and clear.
You can take a foam mouse pad and remount the pump with it under the pump to mitigate much of the vibration and noise.
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Old 07-08-2013, 11:15 PM   #5
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A couple of things to check, because the manufacturers seem to always do it wrong: check on mounting position of pump, if vertical it should be motor end up. If horizontal make sure any seepage can drain out of motor (there's a weep hole between pump and motor)
The water will always surge if you're not drawing sufficient to keep the pump running continuously. See my comments as Lloyd BC on mod #85 Gray water potty flush here: RV Mods, RV Modifications, RV Upgrades, RV Tips, RV eBooks | ModMyRV.com
The lights will usually flicker too, especially LED lights, of which I have 2 in dinette, one over sink.
They're well worth the expense though, when you boondock a week at a time, and use a CPAP all night
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Old 07-09-2013, 04:49 AM   #6
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Mine is mounted on top of a cabinet in the kitchen base. An already loud pump is amplified somewhat by the cabinet. You get used to it. These pumps come on when the pressure drops from opening the faucet. Open just a trickle and the pump cycles on and off, on and off. If it really bugs you, you can add a small air tank called an accumulator to smooth things out. Raz
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Old 07-09-2013, 06:21 AM   #7
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Hi: tastebud... You can get a silencer kit from ShurFlo which are longer hoses. They further isolate the pump from the water lines to lessen the vibration thru the water lines. I always remove the line from the tank to the pump and run the pump for a few sec's. when winterizing our 5.0 so the water will drain out. Again when hooked to city water DO NOT USE THE PUMP!!! Otherwise some noise is normal and you will get used to it.
Alf S. North shore of Lake Erie
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Old 07-09-2013, 10:31 AM   #8
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Same problem Same fix

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Originally Posted by floyd View Post
Some noise is normal and the surge should go away once the lines are filled and clear.
You can take a foam mouse pad and remount the pump with it under the pump to mitigate much of the vibration and noise.
I loosened the pump mounting screws and slid a small sheet of thin closed cell foam under the pump ,then tightened the mounting screws . It eliminated a lot of the noise. If your water tank has sufficient water in it the suction side of the pump will be flooded and the surging due to air in the lines will go away after a short period of time.
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Old 07-09-2013, 10:39 AM   #9
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No matter if pump intake is flooded, you will still get the rrrupp, rrrupp, rrrupp pulsing if the flow is too low to switch pump on continuous, because the pump will build pressure, switch off, drop pressure, switch on, build pressure, switch off, ad infintum. It's the nature of the beast (unless you have one of the fancy variable speed pumps, at nearly twice the price of a standard pump).
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Old 07-09-2013, 10:47 AM   #10
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Thanks to all of you for your quick and helpful responses! I feel better now. I'm going to crawl around and check the location and maybe try the foam / mousepad trick to see if it's more vibration than anything else. To be honest, it's more of a nuisance than a problem. My biggest REAL problem right now is finding a way to secure the cabinet doors so they don't pop open en route. We go over some really bumpy roads here in the wild wild west.
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Old 07-09-2013, 11:06 AM   #11
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On thing to watch out for is a pump cycling when there is no open water use. If the pump cycles intermittantly on its own then you best check for leaks somewhere in the line. Some people turn on the pump and leave it on while camped since it shuts off by itself, if you do that and you are away and something springs a leak then the pump will run until the tank is empty and then burn out the pump. I use my pump and turn it on and off for the task at hand.
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Old 07-09-2013, 11:06 AM   #12
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They BANG allot. That's normal. Use campground connection when available.
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Old 07-09-2013, 11:47 AM   #13
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What sort of catches are on doors, magnetic or 2-roller friction?
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Old 07-09-2013, 11:55 AM   #14
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Originally Posted by stevebaz View Post
On thing to watch out for is a pump cycling when there is no open water use. If the pump cycles intermittantly on its own then you best check for leaks somewhere in the line. Some people turn on the pump and leave it on while camped since it shuts off by itself, if you do that and you are away and something springs a leak then the pump will run until the tank is empty and then burn out the pump. I use my pump and turn it on and off for the task at hand.
Good idea to turn off when travelling or when away from unit. However, assuming you have either a Flojet, or Shurflo diaphram pump, they are designed to withstand 'dry' running. The worst that will happen is operation of the 'Thermal Protection ' switch. This will shut down the pump and will normally reset when the motor cools down. If the pump is 'Cycling' with no water turned on, and no water leaks apparent, there may be an internal leak in pump bypassing the valves, and warranty work is needed.
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