New one to me: City H2O connection overfilled fresh tank - Escape Trailer Owners Community

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Old 05-29-2017, 03:25 PM   #1
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New one to me: City H2O connection overfilled fresh tank

I figure there must be a check valve or something after the water pump?

Anyway, I was hooked up to city water, and all of a sudden my fresh water tank started overflowing out the fill nozzle.

I looked under the bed, I don't see any water inside. Only thing I can figure is that the water went backwards through the water pump?

Until I figure it out, I will leave the city water disconnected. Tank also looks like it ballooned a little bit, not sure if the bottom is usually flat, but it isn't now!

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Old 05-29-2017, 04:32 PM   #2
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I believe it's actually part of the city water inlet.
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Old 05-29-2017, 05:01 PM   #3
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If so that sounds like a PITA to replace.
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Old 05-29-2017, 05:52 PM   #4
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Quote:
Originally Posted by NCBill View Post
I figure there must be a check valve or something after the water pump?

Anyway, I was hooked up to city water, and all of a sudden my fresh water tank started overflowing out the fill nozzle.

I looked under the bed, I don't see any water inside. Only thing I can figure is that the water went backwards through the water pump?

Until I figure it out, I will leave the city water disconnected. Tank also looks like it ballooned a little bit, not sure if the bottom is usually flat, but it isn't now!

2013 Escape 19
There is a check valve in the pump itself. If it gets stuck in the open position, water from the city connection will from through the pump into the fresh water tank. This was addressed in a recent thread. If the following procedure does not correct the problem, the check valve will need to be cleaned or replaced.

Disconnect city water connection.

Pressurize system using 12 volt pump

Turn off pump

Open faucet to release pressure

Reconnect city water and check to see if fresh
water tank is still filling
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Old 05-29-2017, 08:41 PM   #5
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Quote:
Originally Posted by NCBill View Post
I figure there must be a check valve or something after the water pump?
Yes...
Quote:
Originally Posted by C&G in FL View Post
There is a check valve in the pump itself. If it gets stuck in the open position, water from the city connection will from through the pump into the fresh water tank. This was addressed in a recent thread
Here are a couple of threads from last year:
Water tank overflow
Fresh Water Tank Filling When Connected to City Water
Quote:
Originally Posted by padlin View Post
I believe it's actually part of the city water inlet.
There's one there, too, but it serves only to keep the trailer's pump from sending water out the (not in use) city water inlet... not the problem here. One check valve for each water source; when the valve for the source not in use fails, water from the current source goes out the other connection.
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Old 05-29-2017, 08:48 PM   #6
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Originally Posted by NCBill View Post
Anyway, I was hooked up to city water, and all of a sudden my fresh water tank started overflowing out the fill nozzle.
...
Tank also looks like it ballooned a little bit, not sure if the bottom is usually flat, but it isn't now!
There should be a vent on the water tank, both to allow air out while filling, and to allow air in when water is used; in this case it looks like the fill hose and port are serving that purpose.

The tank should not balloon due to being filled, even by the wrong path, because the vent (fill in this case) prevents the tank from become pressurized. The weight of a full tank of water does make the bottom of the tank sag somewhat... my guess is that's all you're seeing.
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Old 05-29-2017, 09:46 PM   #7
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I think you are right on the sag. I never really studied the shape of the water tank, so I didn't have a reference point to consider. Check valve in pump makes a lot of sense. I'll keep using tank water until I am around long enough to watch it in action.
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Old 05-29-2017, 11:41 PM   #8
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Originally Posted by Brian B-P View Post
The weight of a full tank of water does make the bottom of the tank sag somewhat...

confirmed on my mostly empty fresh tank. the middle part. the sides by the strapping are flat as far as I can tell.
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Old 05-30-2017, 12:03 AM   #9
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Put twenty gallons of water in your belly and see if it don't sag some. It's natural and has to give. I've never seen good plastic tanks fail without some help. Pointed impact, extreme sloshing, and old man winter are likey culprits. With me its lack of exercise.
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Old 05-30-2017, 04:35 AM   #10
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Originally Posted by Brian B-P View Post
There should be a vent on the water tank, both to allow air out while filling, and to allow air in when water is used; in this case it looks like the fill hose and port are serving that purpose.

The tank should not balloon due to being filled, even by the wrong path, because the vent (fill in this case) prevents the tank from become pressurized. The weight of a full tank of water does make the bottom of the tank sag somewhat... my guess is that's all you're seeing.
Brian, it does seem somewhat strange to me that water is escaping through the fill hole. Would there be any possibility that this could be the result of a blocked vent or even a restricted vent?
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