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Old 06-22-2012, 01:00 AM   #1
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Silencing the Escape 19 Water Pump

Part 1 of 3
Since the day I got it, my Escape 19 has made a loud hammering noise whenever the water pump runs. This is caused by the pipes attached to the water pump rattling against the framing. I tried stuffing foam between the pipes and the frame and, while it helped a lot, it was still pretty bad. The reason that the pipes rattle is that the rigid PEX piping that is used for the water supply system is attached directly to the diaphragm type water pump.
The SHURflo Installation and Operation Manual for the pump recommends:
- at least 1ft. [.3 M] of ½" [13mm] I.D. flexible high-pressure tubing to both ports.
- The pumps ports/strainer should not be connected to plastic or rigid pipe.
- The pump's normal vibration may transmit through rigid plumbing causing noise, and possibly loosen or crack components.

I finally had enough and bought the SHURflo 94-591-01 Pump Silencing Kit from Amazon.com for $22. It consists of 2 pieces of flexible tubing, one for the inlet and one for the outlet, and a few fittings to attach them. Since the inlet already has flexible tubing attached, one kit can do two trailers.
The parts used are shown in the first picture.
The second picture shows the outlet side of the pump as it came installed from the factory. I had already undone the fitting when I remembered to take pictures.
Attached Images
File Type: jpg Pump Silencer 1.jpg (90.2 KB, 123 views)
File Type: jpg Pump Silencer 2.jpg (94.7 KB, 162 views)
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Old 06-22-2012, 01:02 AM   #2
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Re: Silencing the Escape 19 Water Pump

Part 2 of 3

Undo the fitting on the outlet side and rotate the tee it is attached to 90 degrees. The metal fitting should turn inside the PEX pipe. It should look like the first picture below.
Then insert the male/male adapter that came in the kit and tighten the fitting onto it. Firmly tighten by hand, no tools required. When done, it should look like the second picture below.
Attached Images
File Type: jpg Pump Silencer 3.jpg (102.6 KB, 118 views)
File Type: jpg Pump Silencer 4.jpg (108.0 KB, 116 views)
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Old 06-22-2012, 01:04 AM   #3
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Re: Silencing the Escape 19 Water Pump

Part 3 of 3

Then take the flexible tube and attach one end to the pump outlet and the other end to the fitting that you just put on. Once again, the fittings should be firmly tightened by hand, no tools required. There is a rubber nose in the female fitting and there is no point in over compressing it. The tubing should make a smooth curve as is shown in the two pictures below. When I tried it, I could not believe how quiet it was. I couldn't even hear the pump over the sound of the water running into the sink.

Although it worked fine like this, I didn’t like the way that the pump was cocked on its rubber mounts by the outlet tube being pushed sideways by the PEX tee. I went back and put 5/16" shims under the two feet on the inlet side of the pump so that the rubber is relaxed when the pump is angled to one side. I also replaced the two #8x3/4" PH mounting screws with #8x1" PH screws to allow for the shims. I could have achieved the same effect by shortening the PEX tubing that goes to the hot water tank.

It is possible to so the same job without the kit by going to an RV store and buying the correct fittings and then buying some high-pressure tubing from Home Depot. I was going to go this route until I saw how inexpensive the kit was. I also prefer the crimped-on fittings kit has instead of using hose clamps.
Attached Images
File Type: jpg Pump Silencer 5.jpg (110.9 KB, 119 views)
File Type: jpg Pump Silencer 6.jpg (102.2 KB, 120 views)
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Old 06-22-2012, 06:36 AM   #4
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Re: Silencing the Escape 19 Water Pump

Hi: Harold Kroeker...I always used the noise from the pump as a signal that I was going to have water!!! Our 5.0 already has flexible lines to the pump but maybe just not long enough. I always leave the line undone during winter storage, and you're right...no tools required.
Thanks for the pic's...I'm going to have to look into this solution. We leave the pump turned on at night for flushing, and when the pump runs...everyone's awake!!! Alf
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Old 06-22-2012, 07:58 AM   #5
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Re: Silencing the Escape 19 Water Pump

Quote:
Originally Posted by escape artist
when the pump runs...everyone's awake!!!
I think that the pump waking me in the middle of the night is what finally drove me to do something about it. It is especially bad in the Escape 19 where the pump and rattling pipes are directly under the bed.
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Old 06-22-2012, 08:19 AM   #6
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Re: Silencing the Escape 19 Water Pump

Harold,

I think you have created a monster. I am going to lay awake at night waiting for the pump to cycle to see if I have to implement your modification. Seriously, thank you for a well done explaination. On my next trip I will have to evaluate the noise and potential impact.
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Old 06-22-2012, 08:51 AM   #7
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Re: Silencing the Escape 19 Water Pump

There is also a small plastic pressure tank that you can get along with the silencing kit. It helps the pump run less often, but for a bit longer when it does run - supposedly for longer pump motor life. I put one in when we had a Scamp and it did seem to help both with noise and how often the pump cycled.

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Old 06-22-2012, 10:08 AM   #8
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Re: Silencing the Escape 19 Water Pump

All you need to do to stop hammering is a a U shape to the output side. This is commonly done in households where a hammering in the pipe is happening. This too will give you the flex. Just another option.
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Old 06-22-2012, 11:48 AM   #9
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Re: Silencing the Escape 19 Water Pump

Harold, thanks for the post!

When we looked at an Escape trailer, the pump noise was the one thing that bothered me. The fix looks so simple, this is now at the top of my to-do list.

We will see how noticeable it is when we pick up our trailer later today. Now that I will be listening for it, I am sure it will sound like a jackhammer.
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Old 06-22-2012, 02:48 PM   #10
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Re: Silencing the Escape 19 Water Pump

Your pump should not run in the night time, nor for that matter in the daytime unless you are using water. If it does operate, then you have a leak somewhere. Again, it should not run after shutting itself off, unless you turn on the water or there is a leak. The system is pressurized and it is the drop in pressure that starts the pump.
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