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Old 06-17-2015, 01:10 PM   #1
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2010 27' FB International
Simi Valley , California
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Closet sewer smell

2010 International 27FB

My closet has a distinct sewer smell. This smell, is also present under the closet in the access area.

I understand the cleanliness, negative air pressure, stoppers, etc. but that does not address the problem, only band-aids it.

I had the gray tank valve open and thought maybe that was the problem. I closed it and no change. I then disconnected from the dump connection to be sure it wasn't somehow coming from there. It is still present. The trailer has not moved for several days and the smell, as far as I noticed, popped after we had been sitting (level).

I'm considering sealing the closet area, but that is also just a band-aid.

Any ideas?
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Old 06-17-2015, 01:21 PM   #2
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Have you checked your black tank, and/or the location of that vent?

Our black tank vent is on the roof, directly over the closet.


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Old 06-17-2015, 01:35 PM   #3
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I have this same problem. My vent pipes run through the closet to the roof, and both of the vent pipes do not appear to be loose, or have holes in them. I am curious to see what others say on this one.

To date, I have ripped out all the carpet in the closet, and have sprayed it with vinegar to try and kill any smells. Not sure its really made a difference though.
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Old 06-17-2015, 01:38 PM   #4
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In my trailer there is a vent check valve under the galley sink. It is supposed to be closed except (I think) when the sink/and or gray tank is draining. The output of the check valve is on the gray tank side of all P-traps. If you were connected to sewer with your gray valve open, odors from the sewer system could be absorbed by liquids and solids in the gray tank and drains and could leak past a defective vent check valve. Apparently this meets code because in normal operation there should be no sewer gas to vent inside the living space. My trailer is a 2001 so I'm not sure yours is plumbed the same but I bring this up for your consideration.

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Old 06-17-2015, 03:41 PM   #5
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If you remove the vent cap on the roof, you may notice there is no "sealant" between the sewer vent and the AS shell.... Stinks inside real bad like that.

I sealed around it on the outside with "electrical putty".. Plumbers putty may work just as well. I then replaced and properly sealed the Vent cap.

No mo "Peppy LePhew"!
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Old 06-17-2015, 04:32 PM   #6
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Quote:
Originally Posted by cwf View Post
If you remove the vent cap on the roof, you may notice there is no "sealant" between the sewer vent and the AS shell.... Stinks inside real bad like that.

I sealed around it on the outside with "electrical putty".. Plumbers putty may work just as well. I then replaced and properly sealed the Vent cap.

No mo "Peppy LePhew"!
Can you tell me more about this? I was on the roof this weekend, and there is a putty all around the outside opening of the sewer vent, but not sure about the inside. I did look down the pipe, and the rubber flapper is worn out. Couple questions with that. Is water getting down that pipe and filling my gray water tank? Second, do I need to seal the inside of the pipe as well as the outside? Is there a way to replace the worn out flapper, or do you just replace the entire vent?

Thanks for the help.
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Old 06-17-2015, 06:08 PM   #7
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Under my closet

As you can see from the photo the vent (I don't know if this is for the gray, black or both) terminates under the closet. Also I'm not sure what flexible "vent" is tying into the furnace ducting.
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Old 06-17-2015, 06:16 PM   #8
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Here's the pic

Did that pic attach wrong. Here it is.
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Old 06-17-2015, 07:19 PM   #9
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Quote:
Originally Posted by Steve_M View Post
Did that pic attach wrong. Here it is.
On top of that black pipe is an Auto-Vent. Pop the cap off and check the diaphragm in side. Make sure it is not deformed, clean and seats properly. Also make sure the spring is o.k.
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Old 06-17-2015, 07:30 PM   #10
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Quote:
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On top of that black pipe is an Auto-Vent. Pop the cap off and check the diaphragm in side. Make sure it is not deformed, clean and seats properly. Also make sure the spring is o.k.
As a troubleshooting procedure you could tape a plastic bag tightly over this valve and see if the the closet stinks. If so I think I would replace it, they're not expensive.
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Old 06-20-2015, 08:43 AM   #11
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Lowes sells these autovents for about $10. I changed mine. When I removed the old (original) one, I noticed that there was no proper sealant - it should have either teflon tape or vaseline on the threads when screwed on to ensure that no air (read "phew") gets out.
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Old 06-20-2015, 11:42 AM   #12
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Thanks

I appreciate all of the comments and will be replacing the vent, which does appear to be the problem. Thanks again
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Old 06-20-2015, 10:34 PM   #13
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On our 34', the tank vent penetrates the roof. There was a "ventline" vent cap surrounding it and screwed to the roof.

I removed the vent cap only to find the vent pipe wobbling around in the sloppy hole in the roof. I pressed in a ribbon of "plumbers putty" to seal it off and followed with a topcoat of sealant then plopped the cap down and replaced screws... Problem solved.
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Old 03-06-2016, 09:59 PM   #14
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On my 2015 27fb I have the same strong sewer smell in the closet. (no smell under the closet) This happens when we travel down the hwy with sewer in the tanks. It is especially bad when the fantastic fans covers are open for cabin ventilation in hot weather. The dealer has looked at it twice and still have the problem.... may have to make the 1000 mile trek to Jackson Center. I don't think its from the grey tank... thinking it from the black tank. Next test is to drain just the grey tank and tow to check for smell. Any ideas?
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