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Old 09-03-2016, 07:16 PM   #11
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Join Date: Jul 2016
Posts: 23
Pump rebuild is indicated.

Originally Posted by 5er_tom View Post
Just had the same issue with my Wildcat. There is a check valve in the water pump that is supposed to prevent that.
I ended up just replacing the water pump and problem solved.
The water pump is a warranty item so if your unit is still under warranty FR should replace it for you. I am traveling and in Canada so I purchased one here and installed it myself. I kept the receipt and will seek reimbursement from FR when I get home.
Good luck.

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A lot of us are having this problem, including me. In my case it is intermittent.

I have a brother retired from the industrial pump business and a long time RV owner. He correctly diagnosed it as a problem with the Shurflo pump. His recommendation is rebuild.

I've owned a lot of trailers and all but one had Shurflo pumps. This is the first time in all these years I've had this problem. But I will say this pump in the 8265WS does the best job of maintaining a consistent pressure of any RV I've owned. This back-flow problem from city water into the fresh water tank is my only complaint.

As my problem is intermittent I'm delaying the pump rebuild. Odd I've never had this issue before with one of these pumps. In this case I suspect this is design issue with this particular pump and rebuilding with the same pump parts will eventually result in the same failure mode. This is one of the reasons I have delayed the rebuild.

I've rebuilt the Shurflo pumps before. They are easy to rebuild with simple tools and the rebuild kits are reasonably priced. Figuring out exactly which rebuild kit you need is more difficult that doing the work.


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Old 09-04-2016, 07:03 AM   #12
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Location: Durham, NC
Posts: 1,092
My fresh water fill is located inside a compartment on the side of my 5th wheel, along with the winterizing valves, cable/satellite connections and black water tank flush connection. Next to the fresh water fill cap is a small vent that allows air to escape as water is filling the tank. When the tank overflows water comes out one or both of those places and inside the compartment.

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Tom & Renée
Durham, NC

2015 Wildcat 295RSX
2012 Ford F-250, 4x4, 6.7 Liter Diesel
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Old 09-04-2016, 07:18 PM   #13
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Join Date: Jun 2013
Location: Alliance area north Fort Worth
Posts: 47
Water tank

Had the same problem with fresh water tank filling while hooked to city water (it was the check valve). Contacted Shurflo, my pump maker, since my RV is out of warranty, and they sent me a new pump for free.
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Old 09-04-2016, 10:06 PM   #14
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Join Date: Jul 2014
Location: Sherman Illinois
Posts: 554
The simple fix is to turn off the city water run faucets in the RV to release the pressure. Then turn on the pump and pump water from the tank by again running the faucets. This will normally reset the check valve in the pump. If this does not work you can install an additional check valve in the water line from the pump. This will stop the fresh water tank back-filling problem. You can get a check valve from any of hardware store or Home Depot, Lowes or such.

Chuck & Sandra
2010 F350 CC 6.4
2015 Prime Time Sanibel 3601
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city water, tank, water

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