[davidz71]

Dan,
If I remember correctly, Inland RV Andy mentioned in an earlier thread that there are at least 2 check valves between the pump and the city water connection. I have a PAR pump and had been making my city water connection at my hose reel just behind the roadside rear wheels of my 31' Excella 500. After someone told me that the other female hose connection just in front of my grey/blackwater drain was also a city water connection, I tried it. That's exactly what is was; however, once I disconnected the hose, water would run out that connection at a slow rate when I used the pump. My guess was that at least the checkvalve near the rear hose connection had developed a tear or crumbled once I made that connection. I have not put in a new checkvalve yet but have used a plastic male hose plug found at a garden center to prevent water from going out that way. Cheap fix until later.