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Old 01-21-2022, 06:07 PM   #1
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2015 27' Flying Cloud
Williamsburg , Virginia
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Leak near fresh water tank

We are full time and have a 2015 27 ft Flying Cloud. We recently went back on the road after the holidays and I found that there seems to be a leak somewhere next to the fresh water tank. We are using it bc of cold temperatures right now. Please see pictures of the leak. It is not intruding into the living space at all but I do find a drip outside inside the wheel wells plug in side where the tank is. I donít see any pipes leaking that I see from the inside as well.

Would anyone know what this could be from?

Thank you for your help and thoughts in advance.
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Old 01-21-2022, 06:53 PM   #2
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Check your freshwater inlet valve. Inside. Possible leak between skins. See if you can reach it from inside, feel the insulation, see if it's wet, or if you can see water drips on it from inside the trailer.

And/or take the screws out from outside and see if you can pull it out far enough to see if it's leaking.
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Old 01-21-2022, 06:58 PM   #3
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Okay thank you for the suggestion with check the fresh water inlet from the inside. Will def try and see if I can reach and feel around. Thank you!
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Old 01-21-2022, 07:04 PM   #4
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Also look at the water tank drain hose. Pretty sure It uses hose clamps on barbed fittings. Itís not under pressure just a tank drain hose. Possible access panel under pan at tank drain valve.
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Old 01-21-2022, 07:09 PM   #5
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I just took a hard look again and noticed that the normal water inlet insulation between the skins was wet. Not so much the fresh water tank inlet from what I could see. So that may be the reason.
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Old 01-21-2022, 07:16 PM   #6
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Thanks will also take a look at the drain hose.
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Old 01-22-2022, 11:52 AM   #7
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I have had the spin welds going in to and out of the fresh water tank leak. If you have water in the fresh water tank and the water level is going down without using the water...but water dripping from the area of the connections, you might have a crack in the weld. The only way to fix it is to drop the tank and replace the fitting with another spin weld fitting. Costly......it cost me $975. When you travel down the highway and the water in the tank moves back and forth the pressure can create the leak in the fitting. Good luck.
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Old 01-22-2022, 12:17 PM   #8
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Leak

This an increasingly common problem. When the hot water tank heats the water, the water in the system expands enough to push water pass the seals in the regulator.
Easy fix. Order from an Airstream dealer and add getting the gasket kit because the gasket/seal doesnít come with the new valve.
I suggest while you are waiting for parts, pull the regulator out of the wall cavity so the leak is outside.
Get a plastic sandwich bag and tape the top of the bag over the hole in the side of the Airstream to keep out the rain.
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Old 01-22-2022, 02:41 PM   #9
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Yes, I said freshwater, but meant city water inlet. That sounds like it may be the issue here.
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Old 01-22-2022, 04:44 PM   #10
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Yeah but it’s weird bc we weren’t hooked up to city water at the time. I noticed it before but thought it was just condensation. Can it still drip from city inlet without it being hooked up? Thanks again everyone!
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Old 01-22-2022, 06:26 PM   #11
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Originally Posted by sambeasley View Post
Yeah but itís weird bc we werenít hooked up to city water at the time. I noticed it before but thought it was just condensation. Can it still drip from city inlet without it being hooked up? Thanks again everyone!
Yes, it can still leak without being hooked up to city water. The plumbing system is under pressure even when just using the on board pump and water. This causes the leak at the water pressure valve just the same.
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Old 02-02-2022, 10:02 AM   #12
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Following...good info
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Old 02-02-2022, 12:06 PM   #13
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Quote:
Originally Posted by sambeasley View Post
I just took a hard look again and noticed that the normal water inlet insulation between the skins was wet. Not so much the fresh water tank inlet from what I could see. So that may be the reason.
Most likely the water inlet valve leaks. Easy fix. Just unscrew the outside four screws , pull it off, hang onto the hose on the inside, unscrew it put a new inlet valve in screw it all back together. I did it. Understand it happens every couple years. Plastic is brittle
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Old 02-02-2022, 06:54 PM   #14
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Us, too.

Quote:
Originally Posted by Native143 View Post
Most likely the water inlet valve leaks. Easy fix. Just unscrew the outside four screws , pull it off, hang onto the hose on the inside, unscrew it put a new inlet valve in screw it all back together. I did it. Understand it happens every couple years. Plastic is brittle


Weíre having the same issue. We already felt under the kitchen sink and it is wet along one of the pvc pipes. Hard to actually see. We will have to remove the 2 drawers in front of the pipe and canít figure out how to do that!


Any suggestions?
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Old 02-02-2022, 06:55 PM   #15
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For now we have filled our freshwater tank and disconnected city water. Hope to see no leak outside in the a.m. if we do it must be something else.
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Old 02-03-2022, 03:32 PM   #16
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Originally Posted by One Smith View Post
For now we have filled our freshwater tank and disconnected city water. Hope to see no leak outside in the a.m. if we do it must be something else.


If your city inlet is the culprit, you might still have a leak when using the fresh tank instead. The pump keeps the system pressurized and therefore there is water forced up into the city water valve.
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Old 02-03-2022, 06:44 PM   #17
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Water leak

The problem you are having stems from the hot water heater. When you heat cold water it expands. The closed system has nowhere for the pressure to go and blows out through the city water regulator.
To help alleviate this, when you turn on the hot water heater, every so often open a faucet to release the pressure.
The way I fixed it was to install a accumulator in the system. The accumulator can be placed anywhere on the pressure side of the pump.
When the water expands the accumulator takes the increased pressure hopefully saving the regulator.
Remove the 4 screws holding the city water inlet and pull the regulator out of the trailer.
I would leave the regulator outside u til you can replace it. Take a small plastic bag and cover the top of the hole in the side of the trailer leaving the bottom open so the insulation can dry.
I would order the regulator and gasket kit from an Airstream dealer so that you get both the regulator and gasket. The gasket will not come with a new regulator.
Easy fix.
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