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Old 07-30-2021, 02:04 AM   #1
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Greywater tank slowly filling when connected to city water

I have a real frustrating problem. Have a brand new 2021 Greywolf 23DBH that I picked up just last month. Weíve only taken it out on one 4 day trip to a site with no water hookup, so we used the holding tank and it worked great.

Right now I have it in my driveway hooked up to city water. The other day I noticed my bathtub was nearly overflowing and my grey tank was inexplicably full. I figured I just let the tank level get out of hand and didnít notice because I hadnít been using the bathroom. I dumped the tank, and left the dump valve open overnight. The next day I remembered I needed to close the valve and noticed it still was slowly dripping on the ground. I closed the valve, and an hour or two later I pulled it again. A gallon or two of water poured out on the ground.

I closed it again and waited 20 minutes. Once again, I had water pouring out on the ground.

None of my faucets are dripping, nothing is leaking beneath the trailer, and the rooftop AC condensation doesnít run off anywhere near my stack lines. It hasnít rained in days, either. Somehow fresh water is getting into my grey tank without any water actually going down the drain.

I called the dealership and the service guy I spoke with is completely flabbergasted. He initially thought I had done something stupid like hooked my garden hose up to my black flushout. The black flushout connection is on the other side of the trailer, thereís no way to confuse them, even if, it would fill the black tank, not grey. Iíve heard of bad check valves causing the fresh tank to fill on its own, but canít find any info on self filling grey tanks.

Is there a valve to flush the grey tank with plumbed water that may be cracked open? The only other thing I can think of is some slobbermouth at the factory ran a screw through a pex line and into the greywater tank, but if thatís the case, why isnít there water leaking everywhere? Iíve searched the internet and found a few people with the same problem on a variety of trailers, even an airstream, but nobody has posted any solutions.

What the hell is going on????
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Old 07-30-2021, 04:04 AM   #2
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Water miser valve on the shower perhaps?
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Old 07-30-2021, 04:09 AM   #3
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Iíll double check when I get home but Iím certain the taps are shut off.
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Old 07-30-2021, 04:13 AM   #4
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Now that i think about it that would fill fresh, not gray...LOL
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Old 07-30-2021, 04:27 AM   #5
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I thought you were talking about the little shutoff on the shower head, then I googled it.

That’s a cool concept. It circulates the tepid hot water back to the tank instead of letting it go down the drain. I don’t have one.
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Old 07-30-2021, 05:10 AM   #6
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Maybe you have overlooked the faucet for your outside kitchen. If so, it could be running/dripping.

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Old 07-30-2021, 06:07 AM   #7
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The outside kitchen is just a shower head. There's no sink and no drain.
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Old 07-30-2021, 07:21 AM   #8
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We have seen grey and black tanks plumbed wrong. Any possibility the toilet could be leaking/running and filling the grey tank (assuming it was plumbed incorrect)?


You should be able to see any water in ALL your sinks that would go to the grey tanks, so if the faucets were leaking there, your should see evidence.


If the toilet was plumbed wrong, you may not notice the water going from it's bowl into the grey tank.



Just spitballing here.
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Old 07-30-2021, 07:58 AM   #9
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Filled the toilet full of water while grey dump valve was open and flushed toilet. Confirmed toilet drains into black tank (or at least does not drain into grey tank).
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Old 07-30-2021, 09:05 AM   #10
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Outside the kitchen sink, bathroom sink, and shower.....are there any other sinks in the RV that you are sure are not running their faucets somewhat.

Previous member with same problem thread below

https://www.forestriverforums.com/fo...nk-207606.html
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Old 07-30-2021, 09:24 AM   #11
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No, all I have for plumbing fixtures is a tub, a toilet, a bathroom sink, a kitchen sink, an outside shower, and an outside kitchen which is really just another outside shower.
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Old 07-30-2021, 09:27 AM   #12
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I see in the video below at 2:40 mark there is an icemaker in that outdoor kitchen. Does it have a water inlet and I assume a drain. If so could this drain be going to the grey tank

https://youtu.be/EnUP3QlTJck

More spitballing
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Old 07-30-2021, 09:37 AM   #13
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Nope, it's just a cheap little countertop unit with a rubber plug in the bottom for a drain.
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Old 07-30-2021, 09:54 AM   #14
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I guess you could put a stopper or tape over the shower and sink drains to see if maybe they start filling with water with a faucet leak you may not be seeing.

Outside that, im stumped
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Old 07-30-2021, 01:03 PM   #15
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Is it possible the tank is not completely draining. Found a black plastic plug was stuck across mine and it would not drain all at once. Had to drain multiple times until I found the plug left in from construction
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Old 07-30-2021, 01:09 PM   #16
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I'm not sure. I thought of that as well, but I don't think so, because if you leave the dump valve open, it'll literally dribble all night.
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Old 07-30-2021, 01:10 PM   #17
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He says in post 1 that the bathtub was nearly overflowing and the gray tank was full.
That's more than a tank that didn't drain properly.
This is a real puzzler!
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Old 07-30-2021, 01:35 PM   #18
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Did it rain between the time you drained it and remembered the next day? Lets assume the first time was forgot to empty. There is a vent that goes to the roof, if they left the cover off the stops rain from going in that could be were the water came from.
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Old 07-30-2021, 01:41 PM   #19
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No it hasn't rained for a long time.
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Old 07-30-2021, 02:27 PM   #20
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Try and isolate the fixture(s)/tank that is being impacted.

Empty all of your tanks.

Run water at one spigot/faucet into one of them intentionally for 3-5 minutes.

Go pull handles and record which handle it was.

Repeat until you've hit all water fixtures.

Once you know which fixtures go to this tank, you can start to inspect the plumbing to them.
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