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Old 12-27-2015, 10:40 AM   #1
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Full grey tank

I have a 2010 Cardinal. I am on vacation In the south and my grey tank will not drain. On my sensors the galley shows empty but the grey is full. I have the waste water valve pulled and nothing will come out. Is there a bypass somewhere? What am I doing wrong?
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Old 12-27-2015, 11:21 AM   #2
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Just out of curiosity, how many grey water tanks do you have. If you have more than 1, are you opening the right valve? I'm not familiar with your trailer.
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Old 12-27-2015, 11:37 AM   #3
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I believe I have two. A galley and grey. I am pulling the waste water valve and another valve that isn't labeled between the waste water and the sewage valve.
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Old 12-27-2015, 11:58 AM   #4
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So you have one for the kitchen and one for the bathroom, plus a black water. That makes 3 handles. Are you pulling both grey water valves open? One should empty just the kitchen and the other the bathroom grey water.
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Old 12-27-2015, 12:26 PM   #5
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Yes I am pulling both valves and nothing. My shower is backed up so I know it is full.
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Old 12-27-2015, 12:38 PM   #6
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Ok, what happens when you pull the black water valve? Close the grey valves 1st.
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Old 12-27-2015, 12:45 PM   #7
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What model Cardinal? Is this trailer new to you or have you had it a while and this problem just started?
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Old 12-27-2015, 02:27 PM   #8
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Ok so the left valve is the bathroom grey the middle valve is the black and the right valve is the kitchen grey. I have never just wanted to dump just the grey. I will have to relabel the valves. Thanks for the replies. I am sure I will have more as we are starting to travel long distance for vacation.
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Old 12-27-2015, 02:37 PM   #9
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Your shower drain may be full of hair and debris.
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Old 12-27-2015, 02:45 PM   #10
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Ok I presume all is good now??? I was watching the Lions game.
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Old 12-27-2015, 05:03 PM   #11
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Originally Posted by Cooper092087 View Post
Ok so the left valve is the bathroom grey the middle valve is the black and the right valve is the kitchen grey. I have never just wanted to dump just the grey. I will have to relabel the valves. Thanks for the replies. I am sure I will have more as we are starting to travel long distance for vacation.
gray tanks have smaller diameter pvc pipes. easy to distinguish between black and gray tanks.
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Old 12-27-2015, 05:26 PM   #12
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gray tanks have smaller diameter pvc pipes. easy to distinguish between black and gray tanks.
Maybe, if you can see them. Many tanks and their associated plumbing pipes are enclosed.

Mine are and all that is exposed is two 4“ sewage port stubs located side by side. One port has the black and one of the grey tanks plumbed into it somewhere up under the enclosed underbelly. The other is the galley grey tank. You'd never be able to distinguish between my two by just looking at them.
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Old 12-27-2015, 09:54 PM   #13
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Coop, if your tanks weren't labelled correctly then, if you left the black tank valve open thinking it was the grey,, I would really flush the black tank a lot to get the hard stuff out. I hope it wasn't left open too long because the dreaded mound would possibly start to form for lack of liquid being in the tank.
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