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Old 08-05-2015, 08:57 PM   #1
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Angry Sewage smell

Sometimes while driving with the front window open I get a sewage smell, only while driving with window open. Have u had this problem and how do I fix it ?

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Old 08-05-2015, 09:07 PM   #2
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Close the window.
Seriously........the window open can create a negative pressure inside the coach.

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Old 08-06-2015, 06:49 AM   #3
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Yeah I've had that problem. First I had to figure out if it was the black or gray tank. For me it was the gray, it can also smell pretty rank. The smell was worse in the bathroom under the sink. I replaced the two vents under the bathroom sink. That didn't do it. Next I made sure there was water in the traps. That didn't do it either. I think it was sloshing out while driving. Finally I bought two of those Camco RV Cyclone Plumbing Vents for the roof to replace the existing black & gray vents. Haven't had a problem since. They're a piece of cake to install. Hardest part is taking off the existing caulk. Available at Walmart.
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Old 08-06-2015, 10:39 AM   #4
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The RV Geeks have a video that addresses exactly your situation. FWIW, these guys are awesome. Here's the video link;
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Old 08-06-2015, 01:29 PM   #5
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360 vent works

The 360 vent made all the difference in the world on the last 2 motorhomes I have owned, in fact I ordered the one for this Excursion before I even bought it.
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Old 08-06-2015, 01:38 PM   #6
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My sewage don't smell!!!! LOL

(sorry just couldn't let it go )

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Old 08-08-2015, 04:36 PM   #7
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Thanks, I will be purchasing a 360 vent !
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Old 08-08-2015, 06:01 PM   #8
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Check out this other thread. We had the same issue and it was the black flush valve. Black flush vacuum breaker / anti siphon valve under sink
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Old 08-09-2015, 08:29 AM   #9
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A ziplock bag of water on the shower drain solved my problem.
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Old 08-09-2015, 02:03 PM   #10
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Originally Posted by JerryClark View Post
The 360 vent made all the difference in the world on the last 2 motorhomes I have owned, in fact I ordered the one for this Excursion before I even bought it.
Clay WA5NMR - Ex Snowbird - 1 year, Ex Full timer for 11 years - 2004 Winnebago Sightseer 35N Workhorse chassis. Honda Accord toad.
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Old 08-09-2015, 02:19 PM   #11
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Originally Posted by mjeffrey View Post
Check out this other thread. We had the same issue and it was the black flush valve. Black flush vacuum breaker / anti siphon valve under sink - iRV2 Forums
This scenario is worth investigating. Have had smells in the bathroom on and off for a while but then had a water leak into the basement and come to find it was this vacuum breaker leaking. Replaced this little dipped in gold gem and the leak is gone and as an added bonus, the smell is gone also. I guess that's why they can command such a hideous price for such a simple device.
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Old 08-10-2015, 09:39 PM   #12
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If you just hopped into your RV for the first time in a while, it's possible that your sink/shower P-traps went dry. This happened to me once....adding water to the sinks and shower got rid of the smell for me.

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Old 08-11-2015, 06:49 PM   #13
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It sounds to me like you might want to check your sewer vents. There are usually 2 vents on the roof one for gray water and one for black. If you have any blockage in the vents this can lead to bad sewer smell. Yuck!!!. The other thing I would check is your sewer valves and sewer hose fittings. If any are loose this can be a serious problem. I generally empty all my tanks before I leave any rv park. Fresh water included. It not only helps save on gas mileage. But believe me, it has save me from a multitude of problems and I have never had the holding tank problems so many people on these forums have had.

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