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Old 01-15-2023, 05:22 PM   #1
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2008 34' Classic S/O
Arnprior , Ontario
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Water leak from tank out fresh water

Hi folks
Having trouble with water from my fresh water tank leaking out of my city water inlet. There has to be a check valve that is common to both systems. I just can't figure how I can have a steady drip, out of the city water connection that is draining my fresh water tank.
Any help from A/S plumbers would be greatly appreciated!
Pete
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Old 01-15-2023, 05:50 PM   #2
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There is a check valve on the inlet of the city water. Try pressurizing the system with city water, turning off and on several times to see if that will stop the leak past the valve. If that doesn't work, a new valve is in your future. Also, cap the inlet with a garden hose male stopper.
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Old 01-15-2023, 07:06 PM   #3
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Sorry, I don't understand this. The fresh water tank is below the city water inlet. Water does not flow uphill. Is your water pump on

Some trailers have an expansion tank to smooth surges. The water system pressurizes this tank, and there will be a slight flow from it without city water or the pump being on until the tank is emptied.

Regardless of what is happening, the issue has to be the check valve in, or after, the fresh water inlet.
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Old 01-15-2023, 07:19 PM   #4
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Siphon?

Quote:
Originally Posted by Al and Missy View Post
Sorry, I don't understand this. The fresh water tank is below the city water inlet. Water does not flow uphill. Is your water pump on
My City Water Inlet is well below the level of the fresh water tank, and with no air leaks, it could create a siphoning effect - but only if the check valve is faulty.
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Old 01-16-2023, 08:15 AM   #5
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2019 25' Flying Cloud
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Happens to Me

About 2 out of every 10 times I connect while camping my fresh tank might start to fill after applying city water pressure. Last time I did not catch it until I saw the puddle from the leak at the filler port. I know it's the check valve built into the water pump. I don't want to replace that yet.

I just turn off the water hose and use the pump for that camping location. The next spot I connect, it will likely not backfill and I rest easy for while. I have begun to use a good filter hoping that it will catch any particles (sand, etc) that might interfere with the check valve. For the past week, 3 dfferent locations, all is good and my fresh water tank has stayed down at 6%. Maybe traveling over the road with system pressure at zero helps to shake out any particles.

So the answer is ....I just live with it.
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Old 01-16-2023, 10:14 AM   #6
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Clean out the water pump

My water pump was doing that same thing when I first bought the trailer, filling up the fresh tank when I connected and turned on the city water pressure. Ended up taking the pump apart and found some "Stuff" in the rubber membranes etc. Cleaned it all out and put it all back together and put a filter on the line between the fresh tank and the pump and haven't had a problem in 4 years.
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Old 01-16-2023, 10:41 AM   #7
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run the pump

Hi, Just like the last few posts, the fresh tank will fill with water through the check valve. Turn off city water and toggle on and off the pump quite a few times. this usually gets what ever is causing the check valve to "leak" to clear out. And use a filter. "Particles happen"

Happy Camping
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Old 01-16-2023, 10:46 AM   #8
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I've had this happen to both my AS. So from experience, here is what I did, or to be more precise, what I had the dealer do.

I had the dealer install a check valve between the tank and the pump.

Apparently, the pumps internal check valve is easily susceptible to debris. Having this secondary check valve ensures no backfeed and resolve your issue.

SharkBite U2008-0000LFA 1/2 inch... https://www.amazon.com/dp/B00506ET10?ref=ppx_pop_mob_ap_share
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Old 01-16-2023, 11:11 AM   #9
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Hi

We now seem to have two *very* different problems both in the same thread:

1) Water going *into* the fresh water tank when city water is on.

2) Water going *out of* the fresh water tank when city water is not connected.

At least as I read the original post, he's got problem number 2 and not problem number 1.

Others have mentioned (correctly) that if you just fill the fresh water tank and do not turn on the pump, there should be nothing coming out the city water inlet, no matter what is wrong there. It's not clear if the OP has the pump turned on or not.

It would be nice to hear from the OP get this clarified.

If indeed the pump has been on / is on then the check valve is prone to freeze damage this time of year. (at least around here it is).

If the pump has not been on, we're off down a very different rabbit hole.

Bob
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Old 01-16-2023, 11:26 AM   #10
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This is what the fix is. Simple install, no cutting lines.
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Old 01-16-2023, 12:16 PM   #11
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Quote:
Originally Posted by TR Anderson View Post
My City Water Inlet is well below the level of the fresh water tank, and with no air leaks, it could create a siphoning effect - but only if the check valve is faulty.

I was under the impression that on 2008s the inlet was above waist high on the side. If not, then gravity pressure could cause a leak.
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Old 01-16-2023, 08:01 PM   #12
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Quote:
Originally Posted by TR Anderson View Post
My City Water Inlet is well below the level of the fresh water tank, and with no air leaks, it could create a siphoning effect - but only if the check valve is faulty.
I guess that proves your Airstream is over 20 years old then (I think over 30 I'm not sure exactly when they moved the city inlet up the side of the trailers).
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Old 01-17-2023, 07:06 AM   #13
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Hi

Even on the trailers with the city water inlet "high" the fresh water tank still is below the floor. That has not changed over the years. There is very little water in that feed line into the tank ....

What also has not changed is the pump. If the pump is not running, there is no way for the water to get from the fresh water tank to the rest of the plumbing. It just sits there in the tank .....

Bob
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Old 01-17-2023, 07:58 AM   #14
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Quote:
Originally Posted by white laker View Post
Hi folks

Having trouble with water from my fresh water tank leaking out of my city water inlet. There has to be a check valve that is common to both systems. I just can't figure how I can have a steady drip, out of the city water connection that is draining my fresh water tank.

Any help from A/S plumbers would be greatly appreciated!

Pete


Not sure if mis-assigned nomenclature may be the culprit here. When ‘city water inlet’ is under pressure and water is leaking from the fresh water ‘filler inlet’ ‘over fill pipe/hose’, this indicates the two way valve has failed allowing water to continually fill your fresh water tank past full, excess water will flow out of the fresh water tank ‘over fill pipe’ on to the ground. Is this possibly what you are writing? If this is the case, shutting the ‘city water’ inlet will stop the leak in several minutes. A temporary solution would be to allow the onboard fresh water tank to fill and then de-pressurize/shut fresh water and periodically refill the onboard water tank as needed, until you repair it.
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Old 01-17-2023, 09:09 AM   #15
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Hey guys, read the problem!! Water is LEAKING OUT OF THE CITY WATER INLET!! Running the water pump WILL NOT solve the problem!! That's when the problem occurs, when the pump has the system under pressure from the pump. The check valve in the city water inlet line is leaking back! Sheriff1 showed the problem solver.
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Old 01-17-2023, 09:29 AM   #16
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Water leak from tank out fresh water

Quote:
Originally Posted by CBWELL View Post
Hey guys, read the problem!! Water is LEAKING OUT OF THE CITY WATER INLET!! Running the water pump WILL NOT solve the problem!! That's when the problem occurs, when the pump has the system under pressure from the pump. The check valve in the city water inlet line is leaking back! Sheriff1 showed the problem solver.
You’re adding wording to the Original Posters wording that is not there. Just needed to point this out.


OP Quote
Hi folks

Having trouble with water from my fresh water tank leaking out of my city water inlet. There has to be a check valve that is common to both systems. I just can't figure how I can have a steady drip, out of the city water connection that is draining my fresh water tank.

Any help from A/S plumbers would be greatly appreciated!

Pete
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Old 01-17-2023, 02:53 PM   #17
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1988 32' Excella
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Quote:
Originally Posted by uncle_bob View Post
Hi

Even on the trailers with the city water inlet "high" the fresh water tank still is below the floor. That has not changed over the years. There is very little water in that feed line into the tank ....

What also has not changed is the pump. If the pump is not running, there is no way for the water to get from the fresh water tank to the rest of the plumbing. It just sits there in the tank .....

Bob
???
I was talking about the older trailers having the city water inlet below the level of the floor by a couple inches (like my 88) and also older trailers then mine that had fresh tanks above the floor that could have gravity aid in water running out. These things have changed over the years.
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Old 01-24-2023, 11:46 AM   #18
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Thanks for all the replies. We are back on city water again. To recap, my problem with my 98 34 classic slide is that when I filled my fresh water tank, I had a steady drip/stream of water coming OUT of my city water connection. The pump was OFF. my tank fully drained over the following three days.
Our plan is to fill the tank again and boondocks fir the next three days so we will see if the problem continues or not.
The plan is to drop anchor for yhe next 6 weeks. That will give me yhe opportunity to chase this down.
Again , I appreciate all of the input.
I would have replied earlier, but I had password problems with this site. I need one of my grandkids to travel with us!!!!
Pete
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Old 01-24-2023, 11:47 AM   #19
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Oops

It's an 08 34 classic.
Fat fingers on a small keyboard!
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Old 01-24-2023, 02:57 PM   #20
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Tank full.
Pump off.
Disconnected from city water inlet.
Leak out of city water inlet.

Question...when you say that the tank empties in three days, is the trailer completely idle with no usage/pressurization of water?

Is the water heater on? Running the water heater will pressurize the system even with the pump off. Drips ensue. Then you run the pump to wash dishes or whatever, releasing the pressure. But the pressure builds again when the WH is on. More ensuing leaks. If this is the case, then the check valve is not doing its job. Replace the city inlet or install sheriff1's check valve.

Just a thought, although emptying a tank in three days would be extreme.
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