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Water pump Question

How Can I Make my RV Water Pump Quiet?

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Ensure that the water pump is turned off then locate the water pump in your RV. Typical locations are under the dinette, under the bed, or in a cabinet near the sink. If you can't find it, turn on a faucet and locate the noise coming from the pump (this should be really easy!). A typical water pump will be secured by 4 screws. Remove these 4 screws and slip a rubber mouse pad under the pump. Re-secure the pump being careful to not over tighten the screws. Using a mouse pad will help absorb the vibrations from the pump to the floor. Next, we will locate the rattling water pipes. Turn on the pump. Have a friend open and close any faucet while you try and locate where the clanging noise is coming from. Typical areas are where the cold water pipe passes through or runs along a cabinet wall. In this case, the cabinet acts like a sounding board and creates a lot of noise. Take some 1/2" foam pipe insulation and wrap the pipe where it rattles against the cabinet or flooring. It should slip right over and not require any securing to the pipe. But a little duct tape on each end of the insulation wouldn't hurt. Repeat this step until you have insulated all rattling pipes. Sometimes the water pump can rapid cycle on and off (cycling ON/OFF in less than 2 seconds) during low flow conditions. This can cause pulsations in the water system and create noise. To determine if adjustment is necessary, turn a faucet ON to lower than average flow of water. The pump should cycle, but its "OFF time" must be 2 seconds or longer. If the cycling is correct, no adjustment is necessary. If the pump is cycling rapidly, increase the setting by turning the adjustment screw (see image) clockwise (1 turn MAX.) until the pump operates for 1 sec. with at least 2 sec. "OFF time".

Posted on Aug 27, 2008

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If I undrestand your description, when the resevoir is empty, the float lays on the bottom of the resevoir but, the pump doesn't shut off, after water is pumped out? You have to look at this as opposite of a toilet tank filling with water. In a toilet, the water rises and the foat turn the water flow off. In a sump the water will rise, and the float will turnthe pump on until the resevoir is empty, then it will open the system and turn off the pump. If the float doesn't rise, the resevoir will overflow and the pump won't come on at all. If the float rises and the pump comes on but, the float does "not" drop, the pump will continue to run after the resevoir is empty.
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Is the pump running or just humming? If it is running and you do not have water flow then you may have an air lock in your system.The way to solve the air lock is to fill the tub with water and turn on the pump. Once you have done that then loosen the pump union on the top of the pump (discharge) until you get some water coming out. If that was the problem then the jets will start churning out water

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Hi richkline1,

I'm Harvey the Master Plumber.

Your problem is: You have a 3/4 horse pentair pump. it was pre-plumbed by your pool builder who is now out of business. You installed your solar heater yourself and when you originally installed it on your roof aprox 12 feet off the ground you did not put a check valve after the pump. The basket will no fill with water completely but there is water flowing. there are two inlets in the bottom of your pool and you can barley feel the water coming out of one. before the company went out of business they told you the since you didn't install the check valve after the pump that the back flow of water into the pump has caused the pump now to run in reverse. doesn't sound right to you. they said the something needed to be replaced and they would send someone out. they never did. any thoughts?

I've been thinking about your situation for a few days. First install the check valve. If the problem persists then I would suspect the pump. I have seen a few times that the pump was not the problem. In these cases it was something I call an air lock. It is dificult to explain to the layman but it can be responsible for the lack of flow. It has to do with the way it is piped. I know it seemed simple to pipe but if not done correctly you have this kind of headaike. To solve this I would have to be there. Wish I could do more.

Feel free contact me again!
Please give me a rating here at before you sign off
Thank you,
Harvey your Master Plumber

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