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Old 09-24-2020, 03:46 PM   #1
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Water tank overflowing

We have a new to us 2013 Phaeton 40 QBH. Love the rig and are enjoying using it.

This past week while in a campground, I find that my water tank overflow is running. I have the water hose attached to the campground water spigot with a pressure regulator set on the faucet before I attach my hose. The selection on water valve is for city water (not tank fill). All the water in the coach works great on city water without the water pump on. The issue started about 3 days into use.

My solution to stop the overflow was to shut off the campground (city) water and just use the water in the tank with the pump on.

I am wondering if I am missing some other setting on the coach in the water area so the tank doesn't fill? If I move the water selection valve to Tank Fill, I can hear the tank filling. If I move it back to city water, the tank filling sound stops. Is there some sort of back flow valve (prevention) that may be stuck open that needs to be looked at in the water system? If so, where is it?

This isn't my first motorhome, so I am pretty good with trouble shooting problems. The water overflowing isn't huge, but it is there and no campground owner wants a rig leaking...

The overflowing location is the pipe coming out of the rigs bottom just in front of the passenger side rear wheels.

Any thoughts from anyone?

Thanks!
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Old 09-24-2020, 04:24 PM   #2
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I think It is bleeding through your water pump. But before taking any action fool with the city water control knob to be sure it is not sticking. If that is ok, I would install a check valve in the line so it can not backflow into your water pump. The water pump valves do go bad at times. Installing a check valve will save you some money. Do you search on the forum, there are a number of posters.
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Old 09-24-2020, 08:19 PM   #3
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Quote:
Originally Posted by Dieselgem View Post
I think It is bleeding through your water pump. But before taking any action fool with the city water control knob to be sure it is not sticking. If that is ok, I would install a check valve in the line so it can not backflow into your water pump. The water pump valves do go bad at times. Installing a check valve will save you some money. Do you search on the forum, there are a number of posters.
Thanks, that was the information I was looking for!
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Old 09-24-2020, 09:00 PM   #4
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Also, on our Allegro RED it was the City/Water Fill valve that was leaking by. I know because I had a shutoff valve in the pump inlet line and it would still fill the tank. I removed the valve handle, filed off about 1/8" of the stop area so the valve would close a little further and it eliminated the problem.
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Old 09-25-2020, 10:30 AM   #5
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Also, on our Allegro RED it was the City/Water Fill valve that was leaking by. I know because I had a shutoff valve in the pump inlet line and it would still fill the tank. I removed the valve handle, filed off about 1/8" of the stop area so the valve would close a little further and it eliminated the problem.

Fortunately, I don't think this this my issue. I checked the valve last night. I can see if water is running into the tank when the handle is set for tank fill. I also took off my pump inlet line (from the tank) and turned on the water from the city, the water flowed back through the pump easily... From my understanding, it shouldn't do that if the back flow valve is working correctly in the pump. So either it looks like it a new pump or put in a back flow valve in the line. I will mess with it on Sunday when I have more time.


Thanks!
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Old 09-25-2020, 11:08 AM   #6
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It’s probably a bit of debris stuck in the valve. You can probably fix it yourself if you are handy and take the pump apart..

https://www.dultmeier.com/pdfs/su5000-SERIES.pdf
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