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Old 05-13-2016, 03:56 PM   #1
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City water in fresh water tank

This has happened 2 or 3 times in my friends 1 year old Forest River trailer that he bought new 1 year ago. Hooked up to city water and his fresh water tank will start taking on water. The first time it happened the trailer was only about a month old and Forest River replaced the water pump. Now it has happened twice since then. So is there anything else that might cause city water to get into thee fresh water tank? Or does he have another bad pump? It doesn't happen all the time, just 2 or 3 times in the past year but we are wondering what would cause it
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Old 05-13-2016, 04:08 PM   #2
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I believe the water pump has a check valve that, if broken, will allow the city water to fill the fresh water tank.
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Old 05-13-2016, 04:37 PM   #3
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Quote:
Originally Posted by Iraqvet05 View Post
I believe the water pump has a check valve that, if broken, will allow the city water to fill the fresh water tank.
Thank You for that information. That's what we thought but it has happened twice in a year with 2 new pumps. Guess it is possible to have 2 bad pumps. He is going on an 8 week vacation pulling the trailer from Calif to New Jersey and many stops on the way. He is going to buy an extra pump just in case he has to change it along the way.
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Old 05-13-2016, 05:53 PM   #4
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You could install an in-line check valve so you don't have to rely on the one in the pump. However, it seems strange that he's had 2 bad ones and I've never had one go bad. I don't think they fail all that often.
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Old 05-13-2016, 06:05 PM   #5
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Glad to see that someone noticed the same issue and that I'm not crazy. I filled my fresh water tank to 1/3 when we left on our last trip. Just in case we needed it for pit stops along the way - which we did. Hooked up to campsite water supply and when I got home and went to put the trailer away I noticed the fresh water tank was full. Thinking on the drive home I did remember that the trailer pulled "differently". I've been puzzled as to how this could be the case based on all I've read here about how the systems work. It didn't happen on the trip we just returned from so maybe I had a stuck valve???
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Old 05-13-2016, 06:54 PM   #6
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When you fill the tank do you pour water into a water port or do you connect to city water and flip a valve? You could have a leaking water fill valve.


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Old 05-13-2016, 06:57 PM   #7
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Also a factor is that the level readings can change considerably depending on the levelness of the trailer. This makes it difficult to compare readings, unless the trailer is level for each reading.
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Old 05-13-2016, 07:46 PM   #8
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Check valve at the pump. Had this problem with our Tiffin Motorhome. Too much pressure and you'd fill the whole tank overnight. Less pressure and it wasn't as bad. Either way, check valve wasn't doing its job. Can either install a new check valve or install a stop valve on the discharge side of the pump (and remember to open when needed).
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Old 05-14-2016, 06:43 AM   #9
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Is he using a pressure regulator on the city water line? He maybe in an area of high pressure which will cause the anti back flow valve to fail..
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Old 05-14-2016, 06:57 AM   #10
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I know we've always used an adjustable regulator. Ours was failing around 50 psi, which it shouldn't.
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