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Old 05-08-2016, 09:14 PM   #1
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City fixture = slow drain into fresh

2015 Thor Outlaw..problem just started. We have set to city fixture at full hookup locations, there is a slow but steady amount going into fresh water. We Only knew about it because the overflow started dripping onto mat.

I have tried to slowly move valve handle thru all settings thinking the was out of alimnent .
We turnoffed the city, used fresh water via pump (doing laundry and shower) to drop below 100 gallon lines then went back to city fixture. In a couple of hours it is already at over the 100 gal mark

I will add to repair list, but I feel bad that it is filling the tank-which we loose when driving. Not to mention an added unnessary cost of water usage on the camp facility. We have been Collecting the overflow for dog water, so it works out good. But any help would good.
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Old 05-08-2016, 10:28 PM   #2
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I'm not sure how your Thor is plumbed, but on most the city water hookup is after the water pump. That means the coach side of the pump is pressurized by the city water. There is a check valve inside the pump that is supposed to keep the water from back flowing into the tank. More than likely that check valve is leaking by allowing water to fill the tank. If you have a shutoff valve between the tank and the pump, you can turn that off to stop the back flow. Some of the pumps can be repaired and others have to be replaced when the check valve malfunctions.
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Old 05-08-2016, 10:38 PM   #3
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With city water turn off and water pump turn on, does the water pump cycle on when it not suppose to ( no water is being used but the water pump start running)? If so the check valve in the water pump might be bad. On my first RV I took my water pump apart and cleaned it and it worked fine.
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Old 05-08-2016, 11:05 PM   #4
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How do you put water into fresh water tank........?

Fill Valve ........it could be leaking thru

And yes pump has an internal check valve to prevent backflow when on city water (just like city water connection has a check valve to prevent loss of water when using pump

Secure city water ..disconnect hose and run on pump
Then fresh water tank stops overflowing
No wasted water
And using pump could clear up debris/scale etc on check valve

Win-Win and simple to do
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Old 05-09-2016, 01:09 AM   #5
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Quote:
Originally Posted by Old-Biscuit View Post
How do you put water into fresh water tank........?

Fill Valve ........it could be leaking thru

And yes pump has an internal check valve to prevent backflow when on city water (just like city water connection has a check valve to prevent loss of water when using pump

Secure city water ..disconnect hose and run on pump
Then fresh water tank stops overflowing
No wasted water
And using pump could clear up debris/scale etc on check valve

Win-Win and simple to do
I did this long enough to use 50 gallons, maybe thAt wasn't enough. Normall we switch to "fill " to fill tank. Pump is running normal (we use pump on switch on board to engage pump). We are going to KY horse park for. Few days, they only have water and electric at site. So it will perfect place to check this. I will "fill" mode (vs direct fill door)to make sure tank is full.
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Old 05-10-2016, 06:56 AM   #6
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It will be one of two things, either the water pump check valve of the water control valve. I had to replace both this winter as they were leaking and allowing the fresh water tank to fill and overflow. On my coach the water control valve is a two position control, either city water supply or tank fill. Tiffin parts had one on the way to me ver quickly. PPL had a water pump on sale at that time so I elected to upgrad the water pump while I was at it.
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