Originally Posted by 5er_tom
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.
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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.