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Old 08-01-2014, 07:02 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, 07:09 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, 07:12 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, 07:14 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, 07:21 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, 07:25 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, 07:56 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, 07:59 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, 08:16 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, 08:19 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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Old 08-01-2014, 08:41 PM   #11
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Is this a new trailer? Could it be the piece cut for the fill valve is covering the drain hole?
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Old 08-02-2014, 06:29 AM   #12
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This is our third season with the trailer which we purchased new. The drain has worked perfect many times.
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Old 08-02-2014, 06:39 AM   #13
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Well since it has worked before, pushing air in a low psi (5) would probably clear obstructions in the fresh water tank drain connection. To make sure any of the water system does not get pressurized, I would open a tap on the kitchen sink, remove fresh water fill cap and then push air in drain for a few seconds and see if it clears obstruction.
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Old 08-02-2014, 06:43 AM   #14
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Me, I would do as you have thought of. Blow air up the drain pipe. Opening a faucet will not do anything for your issue as the pump is between the faucet and the tank. Just sounds as though something has lodged itself in the tank drain opening.
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Old 08-02-2014, 09:11 AM   #15
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Thanks everyone. I tried air in the drain to try and clear any obstruction. This didn't seem to do much.

I just pumped the water through the sink and will see if the next trip the obstruction moves. My friend at the RV repair shop told me this morning it's probably plastic from the build. They see it frequently.
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Old 11-21-2014, 06:20 PM   #16
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Fresh Water tank will not drain and its full on 2008 Cardinal 3450 QRL. When city water is hooked up water shoots out the drain plug. Opened interior faucets and still no drainage. Can anyone help?
Thanks bob
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Old 11-21-2014, 06:29 PM   #17
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Sounds like you are opening the low point drain and not the fresh water tank drain.
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Old 11-21-2014, 07:38 PM   #18
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Do u fill your fresh water with a valve while still hooked up at city water connection?

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If like this one sounds like the valve is putting water in your tank and not to your trailer. If so it coming out of your overflow vent.


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Old 12-30-2014, 10:47 PM   #19
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On my first time out with my 320RS the plastic cut out on the black water tank for the 3" piping came out and lodged in the clear 45 in my sewer hose. What a mess!! Then when we got ready to leave, I tried to drain the galley tank and it was really slow draining. Took it to the dealer and they said it was working perfectly. I bet the trip to the dealer moved the plug while driving. Looks like I'll have to dig that one out myself. Any suggestions on how to locate (see) the plug in the galley tank? Take valve and try a bore scope maybe?
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Old 01-08-2015, 08:59 PM   #20
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For the fresh water there is also a vent next to where you fill the tank. Is this plugged? Did you remove the fill cap? Sounds like most have exhausted all other possibilities.
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