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Old 03-05-2015, 08:42 PM   #1
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City water overflowing freshwater tank

On our last trip, I connected to city water and after a period of time it would overflow my freshwater tank. Does anyone know what could cause that? I am thinking that the pump is allowing water back through, but I wasn't sure if there is a valve or something that I may be missing.
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Old 03-05-2015, 08:51 PM   #2
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You are right, the check valves in the pump should prevent this.

Not wanting to have to count on this I added a check valve into my line when I plumbed my trailer. I also added a manual valve that has remained open.

You can repair or replace the pump, (it probably bleeds back pressure and cycles) or add a check valve.


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Old 03-05-2015, 10:59 PM   #3
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If it is on your 2015 FB Sport, the dealer should fix it under warrantee. It will need a new pump as the internal check valve must be leaking.
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Old 03-17-2015, 10:33 AM   #4
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This post is very helpful to me. This is happening in my 2014 30' International.
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Old 03-17-2015, 10:33 AM   #5
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What is the make/model of your pump?
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Old 03-17-2015, 10:46 AM   #6
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There's a check valve at the output end of the water pump...or should be. I also had the same overflow problem. When I went to replace the check valve Airstream had omitted it. I installed one and no more problem. To replace, simply disconnect the line at the pump, slide the valve in and reattach the line.
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Old 03-17-2015, 01:46 PM   #7
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This is a common problem. My pump has been replaced twice under warranty.

I don't know this for sure, but I believe that debris in the valves is the root cause. I believe that disassembling and cleaning the pump would clear up the problem in most cases.
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Old 03-17-2015, 02:22 PM   #8
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Originally Posted by Antique Pedaler View Post
There's a check valve at the output end of the water pump...or should be. I also had the same overflow problem. When I went to replace the check valve Airstream had omitted it. I installed one and no more problem. To replace, simply disconnect the line at the pump, slide the valve in and reattach the line.
The check valve is internal to the pump. Airstream did not omit it, but the internal valve in the pump was leaking. You simply added a second check valve external to the pump, but should not have had to do it. A second check valve can cause extra flow restriction, and sometimes keep the pump from priming properly when first turned on. That OP "fix" caused me hours of problems looking for the cause on one rig I owned. So, I cannot say I think it is a good idea.... grin.
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Old 03-17-2015, 02:26 PM   #9
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Quote:
Originally Posted by Antique Pedaler View Post
There's a check valve at the output end of the water pump...or should be. I also had the same overflow problem. When I went to replace the check valve Airstream had omitted it. I installed one and no more problem. To replace, simply disconnect the line at the pump, slide the valve in and reattach the line.
The check valve is built into the pump, Airstream did not omit it. Your original must have been leaking. Adding a second check valve can cause pressure issues and can cause the pump to not prime properly so I cannot recommend it. I spent hours looking for a pump problem on one rig I owned which was caused by a PO putting an external check valve on the pump.. so, I cannot recommend that .... grin.
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Old 03-17-2015, 02:41 PM   #10
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That's all interesting. This was on an '05 Bambi. I called Airstream who sent me the check valve. After I installed it I called them back to say there was no check valve when I opened the line. Customer service said this somwtimes happens. The water system then worked fine the whole time I owned the trailer.
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Old 03-18-2015, 12:24 PM   #11
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My 2014 FC 20' has no external check valve from the factory. Every pump I have seen has them built in, and that has been true for many years. I can't imagine why the factory service center said that a missing one "sometimes happens".

At any rate, glad your pump worked well with the external check valve. The RV I had which one had been added to would not prime properly with the external valve. When I finally removed it, all was back to normal.

I guess even water systems can be strange at times.
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Old 03-18-2015, 01:17 PM   #12
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My 2004 Classic has an internal check valve. I had the same problem when the trailer was brand new under warranty. Dealer replaced the pump.

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