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Old 10-02-2013, 08:48 AM   #1
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gray water backing up.

My gray ewater tank is backing up into the shower. Tanks is empty and doesn't seem to have any blockages because I can force water thru the pipes into tank, but after while, gray water seeps into shower. Any suggestions on how to clean etc would be appreciated. AS is '03 31 ft classic. Thanks for your help
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Old 10-02-2013, 09:03 AM   #2
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The shower drain is obviously the lowest drain. Does it back up when draining water from the galley sink or the sink in the bath? Sounds as if the water is never reaching the gray tank. All three drains are probably plumbed to a common line that enters the gray tank. That line is likely the location of the blockage point.
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Old 10-02-2013, 09:22 AM   #3
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Originally Posted by rochar3 View Post
My gray ewater tank is backing up into the shower. Tanks is empty and doesn't seem to have any blockages because I can force water thru the pipes into tank, but after while, gray water seeps into shower. Any suggestions on how to clean etc would be appreciated. AS is '03 31 ft classic. Thanks for your help
Have you checked the breather vent on the roof?
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Old 10-02-2013, 09:59 AM   #4
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The shower is generally dumps directly into the tank, without any other piping. Water shows in the shower when the tank is full.

If the tank and drain valve are clear you should be able to open the drain valve and run water from any of the sinks and see it come out the drain at once. If that is OK try running water into the shower and see if it drains from the drain valve. If it does not I would think the shower drain is clogged. Not sure what the source of water is that you see in the shower.

To clear the shower drain I take a simple rubber drain stop, drill a 1/2 in hole through it and force water from a hose through the shower trap. Beach sand tends to clogg the shower trap.

Your description that the tank is empty and water seeps into the shower flies in the face of the laws of plumbing 101.
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Old 10-02-2013, 10:26 AM   #5
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Are you sure the grey tank waste valve is not broken? You may be pulling the handle, but if it broke off from the gate it may not be opening. Like Howie said, open the drain valve and run water through each drain to see if it comes out. If you get anything, the drain valve is okay, and you have a clog somewhere. If you get nothing, the valve is not opening.
Is this a center bath layout or rear bath?
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Old 10-02-2013, 07:22 PM   #6
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Thumbs up Good advice!

I suspect it's one of two things:

1) Broken grey tank valve or
2) Vent (usually on roof) needs to be cleaned

I know they were both mentioned, but those really are the only two options if you are certain there isn't any blockage anywhere else.

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Old 10-14-2013, 12:28 PM   #7
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my gray water is backing into the show ,, just this trip

We have been camping for 5 days. My wife mentioned to me that she heard a sound coming from the shower. So, I got her to fill up the sink, then release the water and almost immediately water was backing into the shower making a gushing sound of water and air, blowing up a couple of inches and leaving about a couple cups of water.
I checked the water temp in the shower and it was cool, not nearly the same water temp from the sink which was all hot water .

BTW-Grey tank was emptied before I did the test, and we performed the test several times all with the same results
This trailer is barley 5 months old and we are careful about putting food scrapes down.
So I am thinking to try Liquid Drain-O.
The absolute funny thing about this whole thing is, our friends that we are camping with have a 20 year old Winnebago gas puller and commented that he had this problem in his unit and we where trying to figure that out only to find out the next day I had the same problem
Could this be a virus, (LOL) What should I do? Does the vent have some sort of a one way valve that could be hung up?
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Old 10-14-2013, 12:53 PM   #8
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This us a common problem. I will try to find the threads. Drain the water slowly and it should not back up. Jim
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Old 10-14-2013, 01:29 PM   #9
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This us a common problem. I will try to find the threads. Drain the water slowly and it should not back up. Jim
I also remember reading a long thread about this problem with a relatively new trailer. I'll help search for the thread.
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Old 10-14-2013, 01:40 PM   #10
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This is the thread I was thinking of. The problem described in the thread may or may not relate to your issue. Do your sinks back up into your shower when you think the grey tank is empty?

http://www.airforums.com/forums/f444...sue-83758.html
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Old 10-14-2013, 02:05 PM   #11
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More Info Please rochar3

Please open your gray water dump valve. Then systematically do the following:
1. Put a gallon of water down the bathroom sink drain. Tell us how much comes out the dump valve.

2. Put a gallon of water down the kitchen sink drain. Tell us how much comes out.

3. Put a gallon of water down the shower drain. Tell us how much comes out.

Once you provide this feedback, we will gladly diagnose your problem.
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Old 10-14-2013, 04:30 PM   #12
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An additional note: I would hesitate to use anything as caustic as Drain-O in your plumbing system.
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Old 10-15-2013, 09:06 AM   #13
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Update on shower overflow

Did the 1 gal @ diff locations and found everything was flowing and no over spill into the shower. Then filled the kitchen sink + 1/2 way again , thinking about 3 gals and filled the bath sink , then let her go .
There was a slight air bobble in the bath sink , then a slight blow back @ the shower and I say approximately 2 oz. of water if that.
  • I realize my first observations probably exaggerated the quantity of water in the shower ( it wasn't cups but a couple of oz.)
  • The water coming up is probably from the trap
  • We have never noticed before because we had company and my wife used more water in that large round sink we have done before .
  • I think its all good but will check the vent stack for blockage just in case and if I find any there will post another update .
  • In future I going to leave the plug in the shower as I did a large volume water test with the plug in and it held back any water and air.
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Old 10-15-2013, 09:37 AM   #14
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Did the 1 gal @ diff locations and found everything was flowing and no over spill into the shower. Then filled the kitchen sink + 1/2 way again , thinking about 3 gals and filled the bath sink , then let her go .
There was a slight air bobble in the bath sink , then a slight blow back @ the shower and I say approximately 2 oz. of water if that.
  • I realize my first observations probably exaggerated the quantity of water in the shower ( it wasn't cups but a couple of oz.)
  • The water coming up is probably from the trap
  • We have never noticed before because we had company and my wife used more water in that large round sink we have done before .
  • I think its all good but will check the vent stack for blockage just in case and if I find any there will post another update .
  • In future I going to leave the plug in the shower as I did a large volume water test with the plug in and it held back any water and air.
Your experiment indicates a blocked vent on the gray tank. If the vent was open there would be no chance of building pressure in the tank to the point it forced the shower trap water back up into the shower.
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