Thread Tools Display Modes
Old 10-18-2016, 04:22 PM   #1
Junior Member
Join Date: Sep 2016
Location: Texas
Posts: 9
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.

Teaman is offline   Reply With Quote
Old 10-18-2016, 04:33 PM   #2
Site Team
Flybob's Avatar
Join Date: Oct 2014
Posts: 3,199
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.
Attached Images


2015 Freedom Express 248RBS
TV 2015 Silverado HD2500 Duramax
TST Tire Monitors
Honda 2000I + Companion
2 65W solar panels
Flybob is offline   Reply With Quote
Old 10-18-2016, 04:34 PM   #3
Senior Member
SeaDog's Avatar
Join Date: Jan 2016
Location: Idaho
Posts: 1,666
X2 what Flybob said
Retired Navy
Jake my sidekick (yellow Lab)
2006 F350 6.0
2016 Flagstaff 26 FKWS
AF&AM of Idaho
SeaDog is offline   Reply With Quote
Old 10-18-2016, 08:28 PM   #4
Senior Member
Join Date: Jan 2014
Posts: 269
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.
jrwalkerpa1 is offline   Reply With Quote
Old 10-18-2016, 08:55 PM   #5
Senior Member
Join Date: Apr 2016
Posts: 211
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.
Cedar Creek Lake, Texas
2016 Wildwood Xlite 171 RBXL
2016 Ram 5.7L crewcab.
CedarCreekWoody is offline   Reply With Quote
Old 10-18-2016, 10:04 PM   #6
Senior Member
Retired JSO's Avatar
Join Date: Feb 2016
Location: NE Florida
Posts: 138
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

Name:	ImageUploadedByForest River Forums1476846242.791843.jpg
Views:	69
Size:	97.7 KB
ID:	123386
Retired JSO is offline   Reply With Quote
Old 10-19-2016, 07:54 AM   #7
Eagles609's Avatar
Join Date: Aug 2015
Posts: 63
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
2014 Forest River Sunseeker 3170DS
TOAD: 2016 Jeep Wrangler Unlimited - Black Bear Edition
Eagles609 is offline   Reply With Quote
Old 10-19-2016, 02:37 PM   #8
Senior Member
Join Date: Apr 2015
Location: Middle GA
Posts: 193
X2 the 360 Siphon. They work wonders!

Ben and Doreen
Home Away From Home - 2017 PT Crusader 315RST
TV - 2008 F250 Lariat 4X4 6.4 Diesel
42 nights camping in 2015
49 nights so far in 2016 (Still Not Enough!)
ben31 is offline   Reply With Quote

vent, water

Thread Tools
Display Modes

Posting Rules
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are Off
Pingbacks are Off
Refbacks are Off

» Virginia Campgrounds

Reviews provided by is not in any way associated with Forest River, Inc. or its associated RV manufacturing divisions.

Our Communities

Our communities encompass many different hobbies and interests, but each one is built on friendly, intelligent membership.

» More about our Communities

Automotive Communities

Our Automotive communities encompass many different makes and models. From U.S. domestics to European Saloons.

» More about our Automotive Communities

Marine Communities

Our Marine websites focus on Cruising and Sailing Vessels, including forums and the largest cruising Wiki project on the web today.

» More about our Marine Communities

Copyright 2002-2015 Social Knowledge, LLC All Rights Reserved.

All times are GMT -5. The time now is 09:33 PM.