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Old 10-18-2016, 05:22 PM   #1
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Gray Water Vent Question

Teaman here.

Anybody know how Sunseeker 2300 graywater tank vent plumbing is fashioned?
I have a 2013 class C since August that has some kind of peculiar odor problem with the graywater tank. Got up on the roof to check vent pipes, was checking that I might order a couple those weather vane vent caps or something. I discovered that the Sunseeker 2300 I have only has one vent pipe thru the roof. Strange.

Need info on where the gray tank vents are.

Problem was odors inside coach immediately after taking a shower if the gray tank valve is in the closed position. I discovered quickly that I had to keep graywater tank valve open to drain all the time to avoid odors.

Another symptom, I closed the valve a couple days before dumping black water tank to have some gray water to flush the line. After dumping the black water tank and closing its valve, I opened the gray water valve to flush, At the end (draining the last gallon or two) I could hear air 'chug-a-lugging' back into the gray water tank. That seems to indicate there is no gray water vent on this tank, as it has to suck air back up the spout to relieve the pressure. Kinda like cola draining from a bottle - 'chug-a-lugging as it drains.

Maybe the gray tank didn't get its vent installed at the factory or something. Seems the strongest odor was coming out from the cabinet under the bathroom sink when the door is opened. Maybe gray tank odors are following the bath sink drain pipe thru the wall and into the cabinet.

I need to fix this before I head out on the road where I'll need to use the graywater tank at campgrounds without full hookups.
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Old 10-18-2016, 05:33 PM   #2
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Some of the grey drains might be vented with an air gap that looks like this. They have been known to fail open. They are easy to replace. You can try tapping on it with the handle of a screwdriver to try to reseat it. Look under sinks etc where grey water is generated.
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Old 10-18-2016, 05:34 PM   #3
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X2 what Flybob said
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Old 10-18-2016, 09:28 PM   #4
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Gray Water Vent Question

Yep, just replaced one in my 3010. Instant fix! I carry a spare now. About $10.00 at Home Depot or Lowes.
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Old 10-18-2016, 09:55 PM   #5
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That is an Air Admittenance Value, not a vent. But check it, it could be bad. You should also have a vent but I'm not sure where it is on your trailer. I had the same issue. Found a spider web in the vent that may have restricted air flow. Also realized I was running the exhaust fan with no windows open to let air into the trailer. This could create negative pressure in the bath area and suck grey tank air in through the AAV if it is not functioning properly.
Doing the above fixed my problem, at least for now.
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Old 10-18-2016, 11:04 PM   #6
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Gray Water Vent Question

The shower in our work and play does not have a conventional "P" trap like all our previous RV's. Under the shower is an inline contraption that is supposed to take the place of a p trap. I have read on other sites that this is most likely the culprit.Click image for larger version

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Old 10-19-2016, 08:54 AM   #7
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On my 3170DS there is only one roof vent, I had the similar gray tank odor post showers, replaced the vent cover with a 360 siphon and haven't had any issues since with gray tank odors post showers
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Old 10-19-2016, 03:37 PM   #8
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X2 the 360 Siphon. They work wonders!
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Old 10-27-2016, 09:51 AM   #9
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Just getting back to the site.. look at the roof of the drive side rear bay. Drop the 10 inch square black cover to see your p trap, your freshwater line is in there also.....
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Old 10-27-2016, 11:34 AM   #10
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Teaman here.

Thanks Hoglou for that info on the Sunseeker 2300. I will definitely check it out. Its hard to find any info specific to this particular rig. I am glad the Black tank does not produce odors until it is about full (a good tip to go dump tanks), But I am not happy with these early Gray tank odors starting within a day or two of closing gray tank valve. Something seems wrong somewhere.

I had a similar problem with a TT I once owned. Turned out the vent pipe had either been installed wrong at the factory, or it had slipped down into the black tank almost touching the bottom. Could not 'Dry' camp with it without odors. Hope that is not the case here.
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