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Old 08-23-2010, 10:12 AM   #1
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Always-RVing's Avatar
Fleetwood Owners Club
Join Date: Aug 2009
Posts: 959
Galley Odor (Grey Tank smell)

Here's one not mentioned. Well,,, I didn't see a post like it mentioning the drain flex hose

This weekend the foul sewer odor was back in the kitchen area coming from the sink cabinet and behind the sink. It was really bad just after I dumped the grey tank and we noticed it when driving home a few weeks ago.

I pulled everything out from under the sink and with a mirror and flashlight looked around but couldn’t find anything suspect.

This morning, I called Fleetwood and described the problem to them. The first time this happened was on the way home from a weekend camping trip.

The odor is definitely a grey tank smell. Fleetwood wanted me to check the roof vents and so I did. There was nothing blocking the vents and there appears to be plenty of room between the vent pipe and the vent cap. A common problem is having the vent cap sitting too close on on top of the actual vent pipe coming through the roof so it's worth checking.

I checked the vent but didn’t think that would be a problem since this issue just started a few weeks ago. We would have noticed before now if there was a problem with the roof vent pipes being too long and pushing against the cap. P-Traps are not being sucked dry and the only area of foul odor is just under the sink. No odor coming out of the sink drains. All other sinks, shower, etc are ok.

Auto-Vent was replaced. No help. Auto Vents are used for each drain where there is no a roof vent. This prevents a vacumm back pressure so the water flows freely and stops P-Traps from being sucked dry. Each sink, shower or clothes washer where there is no direct roof vent should have an auto-vent.

Here is a picture of a typical vent sometimes called a check vent or plumbing air vent. They have a spring or rubber circle flap that open to allow air movement in one direction.

Since this all started the last time I brought the galley slide in, Fleetwood suspects there might be a problem with the sink drain flex hose that moves along with the slideout. It could be cracked, pinched, connetion point coming loose, etc.
Fleetwood Providence 2008 40e
Ford F-350 4x4 Diesel 6.0L 2006
Honda CR-V 2006
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Old 08-23-2010, 12:01 PM   #2
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Join Date: Aug 2010
Location: Near Fort Leavenworth
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I would have highly suspected that the vent in the p-trap was malfuntioning but if you have replaced it I am at a loss to help.
We had one for our half bath sink that caused us some frustration a couple of years ago. Repaced the vent and the problem was solved.
05 Fleetwood Discovery, 39J Model,
07 Ford Explorer, Sport Trac, V-8, 4 x 4 toad.
Served Proudly US Army 1959 - 2006, Retired Twice
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Old 08-24-2010, 07:24 AM   #3
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When I had odors from under the sink I put a baggie and elastic over the vent. The odor went away. I then adapted the pipe to 1/2 " tubing and connected it to another vent that was for the washer.No more odor and the tubing allows venting.
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Old 08-26-2010, 09:33 AM   #4
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Followup: The second auto vent / air vent for the galley sink didn't last two weeks.

The second vent was also defective. A third higher quality vent has been installed.

We hope this vent will last.
Fleetwood Providence 2008 40e
Ford F-350 4x4 Diesel 6.0L 2006
Honda CR-V 2006
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