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Old 06-23-2016, 08:34 PM   #1
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Location: Rogers, AR
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Accumulator Tank, you have the parts

My pump is in a bay under the head of the bed and cycled constantly even with just a trickle of water. To help silence the pump I suspended the pump with straps from an overhead frame in the bay. The pump is suspended in place by the two braided water lines and straps. It's not solidly attached at all. That helped a lot with the noise. The constant cycling can't be good for the pump or switch. I needed a bigger accumulator tank.

The water heater has a small air chamber that functions as an accumulator but the air is quickly absorbed by the water and has to be recharged. I have removed the drain plug and put in a nipple plug, hose, screw on end cap and shrader valve. This lets me add air easily and drain the tank easier than getting wrenches to remove the plug.

The Sureflow tank has an internal bladder which solves the absorption problem and has 42cu. in. capacity.

An accumulator tank can be any size or shape, just needs to be attached to the water system and hold pressure.

I add water by gravity or city water connection. If I empty my white water hose, connect it to the city water connection, defeat the backflow valve and cap the end, my 50ft. 5/8" hose functions as a 184 cu. in. accumulator tank rolled up in the storage bay. Now a good bit of water will flow before the pump cycles on and to connect to city water, just pull the hose out and take the cap off.

To defeat the valve, it could be removed, but I just inserted a screened washer in the line to hold the valve open. A screened washer like is used in clothes washer hoses. The crowned screen holds the valve open. I gave this a try this afternoon and all worked fine. We'll give it a real test next week when we go to Lake of the Ozarks.

2017 Fleetwood Discovery 40D w/2012 CRV toad
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Old 06-24-2016, 12:50 PM   #2
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The pump coming on could be the result of a leaking back flow, or one way valve either in the pump or attached to it. When the pump builds up pressure, the leak is allowing water to back flow into the water tank.

I don't think the air in the water heater is getting absorbed fast enough to cause the problem.

Your water hose is expanding and then holding the pressure a little longer to lengthen the time before the pump comes on again to build up pressure. Replace the one way valve or add another one between the pump and the tank, I bet the cycling stops.


Bob & Donna
'98 Gulf Stream Sun Voyager DP being pushed by a '00 Beetle TDI
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Old 06-26-2016, 01:30 PM   #3
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Could you, would you post a picture of your suspended water pump. Thank you.
1999 Bounder 32H Ford V10, 2012 Ford Focus, Pretty DW, 1 cat. Retired USAF
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Old 06-26-2016, 04:49 PM   #4
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Here's the picture of the pump suspended. The pump touches nothing to transfer it's vibration to the coach. The only vibration transferred is by the water lines, and there is some, but only a fraction of what there was when it was attached to the wall of the wet bay.

The second picture is of the 50' hose attached so it functions as an accumulator tank.
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parts, tank

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