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Old 10-07-2013, 08:02 AM   #1
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Black Tank Odor in Bath Vanity

We have a one year old motorhome and just recently started to get a sewer smell inside the bath vanity.

Any ideas?
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Old 10-07-2013, 08:15 AM   #2
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We have a one year old motorhome and just recently started to get a sewer smell inside the bath vanity.

Any ideas?
I would guess that you have a bad air admittance valve, (aka: mechanical plumbing vent), like this: Do it Mechanical Plumbing Vent - Deerso.com,
(many RVs have them in the grey water drain lines...near/under the sink, near the p-trap).

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Old 10-07-2013, 10:00 AM   #3
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Some RV have the bath lav plumbed to the black tank rather than the grey.

If the coach has been sitting for awhile, ensure water in the sink trap - it will evaporate. Venting as mentioned could be an issue.
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Old 10-07-2013, 10:13 AM   #4
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Remove your P-Trap and tail piece & clean them. Sometimes they get a build up of hair and crud.
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Old 10-07-2013, 06:17 PM   #5
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Originally Posted by mel stuplich View Post
I would guess that you have a bad air admittance valve, (aka: mechanical plumbing vent), like this: Do it Mechanical Plumbing Vent - Deerso.com,
(many RVs have them in the grey water drain lines...near/under the sink, near the p-trap).
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I agree, this is your problem. Most folks don't realize that the gray tank can smell worse than the black. It helps to NOT wash food of any kind down the drain.
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Old 10-07-2013, 07:22 PM   #6
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Quote:
Originally Posted by mel stuplich View Post
I would guess that you have a bad air admittance valve, (aka: mechanical plumbing vent), like this: Do it Mechanical Plumbing Vent - Deerso.com,
(many RVs have them in the grey water drain lines...near/under the sink, near the p-trap).

Mel
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I followed the piping from the vanity sink, but did not see the vent. It goes into the wall. I suppose I will have to cut a whole in the wall material to access the vent.
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Old 10-07-2013, 07:30 PM   #7
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I followed the piping from the vanity sink, but did not see the vent. It goes into the wall. I suppose I will have to cut a whole in the wall material to access the vent.
Why cut the whole wall when all you might need is a hole?
We had that problem in our DSDP some years ago. Found that it was the vacuum breaker valve for the tank rinse system. Took it apart, cleaned and lubed it and haven't had any trouble since.
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Old 10-07-2013, 07:46 PM   #8
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I have a 2002 itasca, 34d. Had this terrible odor and found the valve to be cause. About $5.00 at home depot, etc. we had a valve at each sink and a valve on the clothes washer too. Replace all at once, they remove and screw on easily . Home Depot model had a small spring in center, while others had none. Grey tank smells worse than black in my coach.

DW will appreciate your thoughtfulness too!
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Old 10-07-2013, 07:50 PM   #9
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Why cut the whole wall when all you might need is a hole?
We had that problem in our DSDP some years ago. Found that it was the vacuum breaker valve for the tank rinse system. Took it apart, cleaned and lubed it and haven't had any trouble since.
Spelling mistake. I meant hole. :-)
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Old 10-08-2013, 05:48 AM   #10
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locating air vent

The vent will be plumbed above the p trap height. I found mine by removing a drawer in the bedroom. Start under the kitchen sink and look in the upper rear corners. This will give you an idea of what you are looking for.

Ed H..
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Old 10-08-2013, 05:50 AM   #11
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The vent will be plumbed above the p trap height. I found mine by removing a drawer in the bedroom. Start under the kitchen sink and look in the upper rear corners. This will give you an idea of what you are looking for.

Ed H..

Is there one for each sink?
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Old 10-08-2013, 07:41 AM   #12
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Is there one for each sink?
ejm4

Not all RV sinks have/need mechanical vents/air admittance valves to vent the drains.
A vent pipe is the preferred method of venting a drain.
If/whenever it was possible to easily install a vent pipe to the vent stack a sink drain will not have a mechanical vent.

"Mechanical vents" are usually only used when it is difficult or impossible to plumb a vent using a "vent pipe", (or, IMO, when the builder wants to save to money).

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Old 10-08-2013, 07:56 AM   #13
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locating air vent

Yes each sink, shower, bath requires a vent to prevent the p trap from siphoning. A vent to the stack is best but in my MH I found an air valve at each location. I found the replacements at Home Depot.. had to look hard to find correct size.

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Old 10-08-2013, 06:26 PM   #14
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UPDATE

I cut a small hole in the vanity sink this evening. I could not see any auto vents. It appears it connects directly to the main vent pipe. In order to go further I would need to cut in areas of the wall that are exposed and I don't want to do that.

I looked under the kitchen sink and found one. It was barely screwed in. I removed it and headed to Lowes. Found the replacement for five dollars and some change. Installed the new one and ran some water down the sink and also the vanity - fingers crossed this solved the problem.

I did notice on the new valve that the rubber flap seemed to move more than the one I replaced.
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