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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, 05:20 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?
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Old 11-21-2014, 05:29 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, 06:38 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, 09:47 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, 07:59 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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