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Old 10-01-2020, 01:52 AM   #1
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Black water smell

I have a 2012 Winnebago Vista, 35f, with a mid coach bath on passengers side. It has a macerater pump that pumps waste thru a hose to wet bay on driverís side, rear.

I bought it used 2 years ago with only 11,000 miles. It has always had a slight odor coming from under sink area but recently while working in electrical bay (driver side just behind rear wheels) I noticed it there as well.

Now I had macerator pump replaced this year and the dealer thought this may have been the issue.

Still has smell.

Iím thinking since waste pump hose runs through electrical bay that maybe the hose is source.

Has anyone experienced same issue or have input.

Stinky in IL aka bruce
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Old 10-01-2020, 07:14 AM   #2
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This sounds like the AAV under the sink. (Air Admittance Valve). Because it's more difficult to vent the trap through the roof they use the aav to draw the air into the system to release the suction you'd get without a vent. The factory aav isn't the best one that you can buy. Go to one of the big box stores and you will likely see 3 versions of this in the plumbing section. The cheapest will likely match the one installed. Buy one of the better ones and install that. When we did it we changed them out on all the sinks.


I used this one: https://www.homedepot.com/p/STUDOR-1...0341/202275238
Others have had good luck with this: https://www.homedepot.com/p/Oatey-Su...9230/205395535
The one you will be replacing will most likely look like this: https://www.homedepot.com/p/Oatey-1-...9012/100204205
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Old 10-01-2020, 07:38 AM   #3
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Quote:
Originally Posted by ThomB View Post
This sounds like the AAV under the sink. (Air Admittance Valve). Because it's more difficult to vent the trap through the roof they use the aav to draw the air into the system to release the suction you'd get without a vent. The factory aav isn't the best one that you can buy. Go to one of the big box stores and you will likely see 3 versions of this in the plumbing section. The cheapest will likely match the one installed. Buy one of the better ones and install that. When we did it we changed them out on all the sinks.


I used this one: https://www.homedepot.com/p/STUDOR-1...0341/202275238
Others have had good luck with this: https://www.homedepot.com/p/Oatey-Su...9230/205395535
The one you will be replacing will most likely look like this: https://www.homedepot.com/p/Oatey-1-...9012/100204205
First thanks for the reply.

But Do you think that would explain the smell in the electrical bay which is on opposite side of coach?
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Old 10-01-2020, 11:37 AM   #4
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Not sure I can answer that part. My understanding is that the macerator in the 1/2 bath feeds over to the black tank then it's dumped from there. Yes, there could be an issue with the hose, but I think you'd have other tell-tale signs (fluids) that you would see if that were the case.
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Old 10-01-2020, 09:33 PM   #5
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I agree. I have to look at plumbing to check for the vent device tomorrow. Thanks again
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