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Old 08-01-2014, 08:02 PM   #1
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Fresh Water Holding Tank Doesn't Drain

I can't get my freshwater holding tank to drain. After removing the cap, there was only a few drips. The tank is nearly full and should flow freely. I used a short piece of wire and threaded it up the drain pipe about three inches and it meets resistance. I didn't push hard assuming it was some type of check valve, but I see no reason one would be there.

I can run it out though the sink, but that won't empty it 100%.

What am I missing?
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Old 08-01-2014, 08:09 PM   #2
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For people to help put what type of trailer you have and maybe a picture.
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Old 08-01-2014, 08:12 PM   #3
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All the fresh water tanks I have had in the past and now have valves for the drain, the only things that uses any caps are the low point drains?
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Old 08-01-2014, 08:14 PM   #4
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I would open a couple of taps to see if that makes any difference, if it does then there may be other issues that need looking at.
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Old 08-01-2014, 08:21 PM   #5
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Air has to come in as the water flows out so open a cold water faucet or two to see if that is the problem otherwise it is trying to pull a vacuum . I will assume you are opening a valve under the fresh water tank on the underside of the TT.
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Old 08-01-2014, 08:25 PM   #6
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Quote:
Originally Posted by Campster View Post
All the fresh water tanks I have had in the past and now have valves for the drain, the only things that uses any caps are the low point drains?
My fresh water tank and low points all have caps on them, but I am toying with the valve mod.
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Old 08-01-2014, 08:56 PM   #7
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I never got around to replacing the caps with valves. I am referring the the fresh water tank under my Surveyor 240

The system does pressurize and pump water, however i did open the low point drain and released all pressure.

Does anyone think attaching the winterizing air valve and pumping in some air would help? I would close the low point and open the fresh water tank.
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Old 08-01-2014, 08:59 PM   #8
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Quote:
Originally Posted by tabkld93 View Post
I never got around to replacing the caps with valves. I am referring the the fresh water tank under my Surveyor 240

The system does pressurize and pump water, however i did open the low point drain and released all pressure.

Does anyone think attaching the winterizing air valve and pumping in some air would help? I would close the low point and open the fresh water tank.
If the tank is not venting now you risk rupturing the tank by adding air pressure to the system.
The water should free flow with no help.
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Old 08-01-2014, 09:16 PM   #9
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I had the same trouble yesterday. With the valve handle positioned in line with what looked like it should drain.....it did not.
Oddly I turned the knob perpendicular and it drained .?? It worked, and do not understand why.
Try it....different positions.


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Old 08-01-2014, 09:19 PM   #10
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Quote:
Originally Posted by tabkld93 View Post
I never got around to replacing the caps with valves. I am referring the the fresh water tank under my Surveyor 240

The system does pressurize and pump water, however i did open the low point drain and released all pressure.

Does anyone think attaching the winterizing air valve and pumping in some air would help? I would close the low point and open the fresh water tank.
Have you drain the fresh water tank before using this drain? Maybe you have wrong drain?
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