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Old 05-23-2024, 04:19 PM   #1
METCO
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Fresh water tank filling on city water

I've read many of the other post and all seem to discuss the pump as the issue. I'm not sure that is my case. My water has a valve that one has to choose city or tank. I've never used my freshwater tank and it's only been run during the demo when I purchased it new from a dealer. The dealer says to bring in in and they will get to it as it's under warrantee. BIG deal. I live in this all summer. I'm not living in the dealers lot. The city water is leaking into the freshwater tank and a steady stream. Any Ideas? this is an example of my city/tank connection
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Old 05-24-2024, 03:22 AM   #2
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Your problem lies with the pump also. That lever controls the input to system or tank but even on street water there is pressure in all the water lines. This includes the water pump and the check valve in the pump keeps the water from backfeeding into the tank. There are various ways to try and clear debris from the pump check valve but sooner or later the check valves tend to fail. The only sure way to make sure it never happens is to put a check valve in the suction line that feeds the tank water to the pump. This will work no matter what shape the check valve is in.
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Old 05-24-2024, 11:35 PM   #3
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I realize what you were saying about living on the Dealers lot all summer but just in case, The Dealer will not allow you to live on their lot as their insurance won't allow it. Good luck with the fix.
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Old 05-25-2024, 03:54 AM   #4
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@Martian is correct about everything. The only nuance I might add here is, when I set up my pump cabinet I put the brass check valve between the pump and the rest of the plumbing. IE after the pump, not before. Iím wondering if that might be better in your case since you never use your pump. That way no pressure from city water ever gets to your pump at all.

In either case this should fix your problem.
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Old 05-25-2024, 06:49 AM   #5
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In the picture attached in the op, there is one hose connection to both fill the FW tank and run city water. Therefore, the selector valve can fail and not divert water but rather feed both output lines. Those valves typically have O rings inside to separate the water flow. If you turn that valve while the water is turned on it can dislodge or destroy the O ring causing the valve to fail.
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Old 05-25-2024, 07:36 AM   #6
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Originally Posted by flybouy View Post
In the picture attached in the op, there is one hose connection to both fill the FW tank and run city water. Therefore, the selector valve can fail and not divert water but rather feed both output lines. Those valves typically have O rings inside to separate the water flow. If you turn that valve while the water is turned on it can dislodge or destroy the O ring causing the valve to fail.
Its NOT the water pump, they RARELY fail. With the OP's selector valve( same one I have) My money is on the valve.
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Old 05-25-2024, 04:58 PM   #7
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When our tank filled years ago, it was definitely the check valve in the pump. I resolved this problem with an inline Sharkbite check valve. Initially, I installed it on the suction side of the pump, but quickly discovered the suction side fittings at the pump were not capable of handling the pressure, and moved the check valve to the pressure side of the pump, and haven't had an issue since. The check valve is the brass device on the blue line above the pump.
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Old 05-25-2024, 06:06 PM   #8
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I had the same issue, turned out to be debris in the pump diaphragm allowing the city water pressure to back feed thru the pump into and overflowing the fresh water tank.

Simplest fix is to install a check valve on the intake side of the water pump.

You can open up the pump and clean out the tiny debris, but that won't be the last time, god only knows how many tiny pieces of plastic are in that tank form when it was installed.

Those valve assemblies at your connection rarely fail. I made a replacement for it from Home Depot parts only to find there was nothing wrong with the original valve assembly, others have found the same thing. All this happened while camping at Fort Pickens on Pensacola Beach which is a very long way from town for parts, etc...
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Old 05-25-2024, 06:11 PM   #9
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As a tech, Iíve seen more valves fail than the water pumpÖ..just sayin.
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Old 05-25-2024, 06:21 PM   #10
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Originally Posted by chuckster57 View Post
As a tech, Iíve seen more valves fail than the water pumpÖ..just sayin.
Understood, I haven't bothered to clean the diaphragm after installing the check valve on the intake side of the pump. I should probably install a strainer prior to the pump and clean the diaphragm again.

I do filter the water before it hits that valve assembly, could that be the reason I haven't had any issues with the selector valve?

When I built the replacement because my initial thought was that the valve assembly had failed, that was a challenge to make it small enough to fit into that area. Once I found out the back feed was from something else, I put the original back and it is still functioning fine nearly three years later.
All off this Christmas week on the beach.
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Old 06-02-2024, 08:07 AM   #11
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Fresh Water Tank Filling On City Water

I had the same problem. Took it to dealer but they could not duplicate. Continued research and found one solution. If you open a faucet with out turning on pump, it creates an air bubble and does not allow the check valve to close. If that happens open all the faucets then turn on the pump. Worked fro me and never had the problem again.
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Old 06-02-2024, 09:40 AM   #12
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My fresh water tank was back filling from city water. I took the pump apart and found the diaphragm had failed - it's been a couple years but as I recall the edge of the diaphragm had a crease in it and wouldn't seal completely. I tried to repair it but that didn't work. Shur-Flo sent me a new pump under warranty and that resolved the issue.
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Old 06-04-2024, 03:51 PM   #13
METCO
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City water filling freshwater tank

I had an RV repair company visit my camper and diagnose it. They claim they've seen this before from this pump and tell me they ordered a replacement pump. I suppose I'll need some pretty good luck sending the extended warrantee the bill??? LOL we'll see if it's the cure. It should be fixed by next week.
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Old 06-04-2024, 04:25 PM   #14
sourdough
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I had an RV repair company visit my camper and diagnose it. They claim they've seen this before from this pump and tell me they ordered a replacement pump. I suppose I'll need some pretty good luck sending the extended warrantee the bill??? LOL we'll see if it's the cure. It should be fixed by next week.

Hopefully you made the cursory call for "prior approval". If you involve them they are usually pretty cooperative (at least mine has been) but just "do stuff" and send them a bill.....all bets are off.
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