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Old 06-12-2018, 05:50 PM   #1
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National RV Owners Club
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Location: Reno, NV
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Plumbing Issue

When I use water from a campsite, I turn the lever to city water and turn off the pump. After a little while, water starts dripping from the fresh water tank overflow. It seems that somehow the water is also going into the tank. It doesnít seem to overflow at the same volume as when I fill the fresh water tank and itís full though. It makes quite a mess around the rig. Any ideas ?

Itís a 2004 TropiCal

Thank you !
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Old 06-12-2018, 06:12 PM   #2
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National RV Owners Club
Ford Super Duty Owner
Join Date: May 2007
Location: El Cajon CA
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Sounds like your selector valve CITY/TANK FILL is going bad.
2007 Sea Breeze LX 8321 Ford Chassis
2004 Ford Ranger Edge
El Cajon CA.
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Old 06-12-2018, 06:19 PM   #3
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Originally Posted by Richard S. View Post
Sounds like your selector valve CITY/TANK FILL is going bad.
Wayne & Roberta and Maggie the Miracle Dog 08 Winnebago Destination 39W Gas UFO Workhorse Chassis......Never make a woman mad. They can remember things that havenít even happened yet.
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Old 06-12-2018, 09:27 PM   #4
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National RV Owners Club
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Posts: 55
Mine did the same thing replaced the watts valve easy job but it was tough to find the original valve a lots of plastic ones out there, National used a watts brass valve found one on eBay job is done no more overflow of the water tank.
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Old 06-13-2018, 11:44 AM   #5
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Location: Morgan Hill, CA
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It might also be the check valve at the pump. When on city water all the lines are at city pressure. Including the feed from the pump. If the check valve is not sealing it will allow water to flow backwards through the pump into the fresh water holding tank. The check valve maybe built into the pump and not external. A simple test would be to connect the rig to city water. Leave the valves set to city and not fill. Disconnect the line between the fresh water tank and the pump. there should be no water flowing back towards the tank. I would hate to have changed the diverter valve only to find out was a check valve. But the diverter valve sounds like a good place to start. If you can disconnect the tank side then watch to see if there is any water flowing out that side of the valve when connected to a city water supply.

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Old 06-20-2018, 10:41 PM   #6
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I had this problem when the coach was only two years old. So I replaced the three way valve. It did not solve the problem. two more years went by and I change the water pump guess what no more water overflow. It is a lot easier to change the water pump than that three way valve. You might like it, maybe not. Alvin
2007 National Surf Side 29A
2011 HHR Toad
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