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Old 02-26-2013, 05:14 PM   #1
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Please please help with gray water problem

I've a Monaco Dynasty. When I'm fully hooked up to w/e/s, and I leave
The grey water valve open, all is well when I take howler or do laundry.
When I close the grey valve - like it would be if I was on the road, the shower fills with water - During any Grey water use.
I checked under the sink and cleaned the air vent there, took it off the pipe, totally uninstructed - run shower and shower pan fills up. Water will not go into the empty grey tank.
The monaco guy says it might be an air escape pipe clogged on the roof, I've yet to check - but I've never
Seen swarms of wasps anywhere ( he said look for wasp nest)
The RV Guy nearby said it is pro ably a pinched air hose/pipe somewhere.
No telling how much to fix. He said he might have to take a slide out of the bus to fix it. And hours of looking for problem.
Might anyone here know where to tell me
To look. New widow, could sure use some advice/help.
Every time I take it to rv shop - no kissing before it after the total screwing I get. Sorry to be so crude but I've been seriously ripped off.
Thanks in advance for your help and consideration.
Anita. 407-230-7370
Oh, extended Warantee expires tomorrow.
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Old 02-26-2013, 05:25 PM   #2
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If your warranty expires tomorrow I'd get it looked at today.

And is it just me or was the response above posted like 6 times?
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Old 02-26-2013, 05:34 PM   #3
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My first idea would be the roof vent is obstructed. It is not uncommon to have wasps or mud daupers build nests in them. The cap on the vent will have to be removed and a drain snake or even a garden hose used to clear it.

Almost forgot to mention that vent pipes have been known to come loose and fall to the bottom of the tank, blocking the vent.
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Old 02-26-2013, 05:41 PM   #4
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Can you find and get to your shower trap and take it apart and clean it out? The other thing here is the shower in any RVis the lowest point to the gray water tank and when the tank gets full the shower or tub will get water in it, so for you to run the kitchen sink and have water backing up in the tub I would have to think the tank is full or the plumbing going into the tank is plugged.
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Old 02-26-2013, 05:48 PM   #5
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Do you have an indicator that shows how much is in the grey tank?
When you have the grey tank valve open does any flow out at all?

I would snake down the shower drain and the roof vents.
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Old 02-26-2013, 06:45 PM   #6
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What about trying a plunger on the shower drain. Maybe there is a clog. I think your plumbing should handle the pressure from a simple plunger. Get some water in the shower first and let the water help push. Maybe a cheap fix.
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Old 02-26-2013, 06:52 PM   #7
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After reading the OP carefully I see a couple of clues.

With the gray water valve open and hooked to campground sewer all is well. This rules out a plugged drain or full tank.

With the valve closed, gray water won't enter the tank - it goes to the shower tub. This clearly points to a vent problem. When hooked up to an exterior (vented) system with the valve open, gray water flows freely. With the valve closed, the tank is not venting and water finds a different path.

That's my take for what it's worth.
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Old 02-26-2013, 07:06 PM   #8
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But wouldn't the shower drain act as a vent? Flowing to the tank and sucking air from the shower?
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Old 02-26-2013, 07:11 PM   #9
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But wouldn't the shower drain act as a vent? Flowing to the tank and sucking air from the shower?
The P drain would keep the shower drain from acting like a vent.
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Old 02-26-2013, 07:15 PM   #10
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I was thinking, if the suction was enough, it would over-come the water the p-drain.
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Old 02-26-2013, 07:18 PM   #11
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Maybe the plunger would clear the plugged vent?
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Old 02-26-2013, 07:21 PM   #12
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Other drains

Do other drains back up too? If it were truly the vent I would think the kitchen & lav sinks would act weird too.

If the other drains do the same thing the only reasonable explanation is the vent. I don't know about you but I know my wife would NEVER climb up on top of our coach. Nor do I recommend it if you're 'less than thrilled' at the prospect.

No idea how old your coach is but there's a good chance taking the vent off will destroy it and it will have to be replaced.

Not crude. Descriptive. I know I've said it many times.

Good luck with it, and let us know the outcome.
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Old 02-26-2013, 07:32 PM   #13
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Lets look at this logically. I think if the vent was clogged the air would escape through a sink or shower drain. But it would still drain I think. It sounds to me even though when your drain valve is open your tank isn't empty. You think it is but it's not.
Other option. Someone replaced the tank with a much smaller tank. Therefore when the valve is closed it's filling up quickly.
Or somehow in your tank it doesn't drain off the bottom. The drain sits higher up on the tank. I just don't see a clogged vent doing what's it is doing. Air will force out one of the drains. Just me thinking out loud.
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Old 02-26-2013, 08:06 PM   #14
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All the other p-traps and drains in the coach are higher than the shower drain. If the water backs up because the pressure builds up in the gray tank (due to clogged vent), it's going to come out at the lowest point. The pressure required to push up the water in the shower p-trap is less than that required to push it out of a higher p-trap.

Here's a quick experiment. Push a small section of hose through a sink p-trap, then blow the water out of it (effectively removing the water block in the trap). Then try to drain from a different sink. Is there air coming out of the hose? Does the water drain into the tank now? If so, the vent is plugged.
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