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Old 11-29-2021, 08:14 PM   #1
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Fresh water confusion

I have a confusing event happening when I hook up my TT to water.
When I hook up to water at camp sites,
Water flows through lines correctly,
but also fills up my potable water tank at the same time? I looked for a check valve on my water pump lines and I'm unable to locate one.
Could it be internal on the pump and have failed ?
Or is it supposed to fill up when connected?
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Old 11-29-2021, 08:23 PM   #2
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multiple threads a week about this. Check valve in pump is stuck open. turn off the water and run the pump.
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Old 11-29-2021, 08:25 PM   #3
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Quote:
Originally Posted by Tazmiki View Post
I have a confusing event happening when I hook up my TT to water.
When I hook up to water at camp sites,
Water flows through lines correctly,
but also fills up my potable water tank at the same time? I looked for a check valve on my water pump lines and I'm unable to locate one.
Could it be internal on the pump and have failed ?
Or is it supposed to fill up when connected?
Disconnect from city water, run the fresh water pump several times. See if that clears the internal check valve.
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Old 11-29-2021, 11:55 PM   #4
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Ok so there is an internal check valve then?
If remaining stuck open, then replace the pump perhaps ?
Am I able to add an external checkvalve to it ?
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Old 11-29-2021, 11:59 PM   #5
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If you have a shower miser, it could be that as well.
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Old 12-02-2021, 08:29 PM   #6
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Quote:
Originally Posted by Tazmiki View Post
Ok so there is an internal check valve then?
If remaining stuck open, then replace the pump perhaps ?
Am I able to add an external checkvalve to it ?
There is a check valve - that is what LCDR & Kimber were talking about. FWIW, if you leave your water pump turned on while hooked up to city water connection, it can cause the check valve to not work properly and your FW tank will eventually fill up (it's happened to me a couple times). The instruction for shutting off the city water supply and then cycling the 12V pump will frequently reseat the check valve. Then don't forget to turn off the pump before turning the city water supply back on.
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Old 12-02-2021, 09:49 PM   #7
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Quote:
Originally Posted by Tazmiki View Post
Ok so there is an internal check valve then?
If remaining stuck open, then replace the pump perhaps ?
Am I able to add an external checkvalve to it ?
1. Yes, built into the head of the pump.

2. You can, many have luck with the reseating process or disassembling the pump if it is debris.

3. Yes, an inline, external check valve has been added by many. Some have even installed 1/4 turn, manual shut off valves.
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Old 12-03-2021, 04:35 AM   #8
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I ended up just cutting in a shut off, to not chance back filling the fresh tank, as it seemed to have a mind of its own, even after taking the pump apart a few times. Works fine on pump only when turned back on. i am mostly connected to city water, so the shut off stays off unless use for traveling. Some never have a problem, mine started when i had a place with high psi, even with a regulator.
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Old 12-03-2021, 12:19 PM   #9
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Originally Posted by Tazmiki View Post
Ok so there is an internal check valve then?
If remaining stuck open, then replace the pump perhaps ?
Am I able to add an external checkvalve to it ?
Water pumps are almost always repairable if not leaking water (cracked housing) and motor runs.

Kits are available and rather inexpensive so if that is a concern it might be good to find pump model #, purchase a rebuild kit, and keep on hand.

If you have the kit on hand chances are you'll never have a problem in the future

BTW: if the pump is a Shurflo 4008 a complete repair kit, including check valve, is only $12.50 (Walmart.com).
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Old 12-04-2021, 03:30 PM   #10
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Thank You
I'll need to see which one I have ,
Greatly Appreciated.
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Old 12-04-2021, 04:48 PM   #11
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If you have the kit on hand chances are you'll never have a problem in the future
That seems to be the best way to ensure you never have a problem with a component, buy and carry a spare one.
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