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Old 06-21-2021, 07:55 PM   #1
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Stink from kitchen sink!

Hi - 2015 Winnebago Vista stink issue. We pulled into Camp Margeritaville in Pigeon Forge. Very nice campground but no shade yet. Anyway no smell on last trip or on the way there. After a couple hours with the sun shining on passenger side where the kitchen sink is we start to smell something bad. It was over 90 outside. I hadnít hooked the sewer up yet and the smell isnít coming from anywhere else.

Flushed with water and added tank treatment to the sink just in desperation lol. Is there just something caught in the p-trap and the heat activated it??

Thanks for any suggestions!
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Old 06-21-2021, 07:58 PM   #2
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Is it coming from the sink or under the sink? A common problem with odors from the gray tank is the AAV (Air Admittance Valve) under the sink.
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Old 06-21-2021, 08:02 PM   #3
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There should be an air admittance valve in the plumbing under the sink. It can stick open thereby allowing gray tank odors to backflow into the RV. Remove the valve, most simply unscrew, shake it. If you can feel the valve shaking it is good. They are commonly available at hardware stores.
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Old 06-22-2021, 05:15 AM   #4
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Stinky smells often come from the grey tank as most folks do not treat that tank often. We learned a long time ago to treat both black and grey tanks. There are a number of products on the market that are useful to help reduce those ugly smells. Find the one(s) that work for you.
I annually clean our tanks out with a trisodium phosphate solution in 1/2 tank of water for a 2+ hour drive. Helps remove all the leftover gunk. It really works for us. good luck.
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Old 06-22-2021, 05:20 AM   #5
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Perhaps just jouncing around on the highway the water got drained out of the "P" trap. Run enough water to refill the trap and see if the odor subsides.
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Old 06-22-2021, 06:48 AM   #6
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Well I got up this morning and it’s cooled off due to pouring rain lol. The smell has mysteriously disappeared. I’m going to poke around under the sink to see if I have one of those relief valves. I’m pretty sure I don’t. I’m sure it has a roof vent.
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Old 06-22-2021, 07:56 AM   #7
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Quote:
Iím going to poke around under the sink to see if I have one of those relief valves. Iím pretty sure I donít. Iím sure it has a roof vent.
It is not at all uncommon to have both. I would guess that most RVs do.
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Old 06-22-2021, 09:39 AM   #8
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Originally Posted by Kelm130 View Post
Well I got up this morning and it’s cooled off due to pouring rain lol. The smell has mysteriously disappeared. I’m going to poke around under the sink to see if I have one of those relief valves. I’m pretty sure I don’t. I’m sure it has a roof vent.
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It is not at all uncommon to have both. I would guess that most RVs do.
The air vent is placed in the plumbing after the P-trap so water flowing through the drain doesn't pull out the water in the trap with the vacuum created by its flow. The vent allows outside air to enter so the water in the pipe flows easily. The roof vent is typically connected further downstream in a main pipe that flows into the grey tank, a pipe to which the sink pipe connects. As mentioned, you probably have both types of venting, which is typically found in RVs.


Your situation looks to be as described by others, and is a very common issue and easily solved. The heating by the sun on the passenger side of the rv probably heated the grey tank water and the air inside to where the expansion leaked through the faulty air vent.


BTW, simple vents like the black one shown cannot be tested by shaking and they are not true Air Admittance Valves, but rather Automatic Air Vents. They perform the same function, are cheaper, but have a spring and diaphragm which can fail. The cost is probably the reason they are most commonly found in RV plumbing.


A true Air Admittance Valve has no springs or thin rubber diaphragm to warp. The seal is created by the weight of the sealing part itself. When negative pressure is inside the pipe, that pressure pulls the seal up and allows outside air to enter. When pressure equalizes, the seal drops down once again.
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Old 06-22-2021, 11:34 AM   #9
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Well I do have them under both sinks. No smell today so far!!
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Old 06-23-2021, 10:28 AM   #10
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Well, we donít have a Winnebago anymore, we now have a Fleetwood. But, earlier this year, in our Fleetwood, we had a horrible odor coming from behind our washer and dryer. Particularly when it got hot or I used the dryer. We removed the drawers from the dresser next to the washer and dryer and found what looked like an air gap or vent. Having no idea what it vented, we decided against it being the grey tank because we keep it open when doing laundry. We decided it was the fresh water tank. We added a cup of bleach to the fresh water tank and then emptied it by running the water through the entire system and out through the grey tank. We did that twice and the stink is gone. Still not sure if it was grey or fresh, but what we did cleaned and disinfected both.
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Old 06-23-2021, 10:36 AM   #11
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Well, we donít have a Winnebago anymore, we now have a Fleetwood. But, earlier this year, in our Fleetwood, we had a horrible odor coming from behind our washer and dryer. Particularly when it got hot or I used the dryer. We removed the drawers from the dresser next to the washer and dryer and found what looked like an air gap or vent. Having no idea what it vented, we decided against it being the grey tank because we keep it open when doing laundry. We decided it was the fresh water tank. We added a cup of bleach to the fresh water tank and then emptied it by running the water through the entire system and out through the grey tank. We did that twice and the stink is gone. Still not sure if it was grey or fresh, but what we did cleaned and disinfected both.
I strongly suspect the vent you found was the AAV for the grey tank, in line with the washer/dryer. Fresh tank vents are not typically found extending inside the coach, but rather are located at the top of the tank itself. The fact that you leave the grey tank open when doing wash does not necessarily eliminate the grey tank from producing odors as the foul air rises if warm and tries to vent out the plumbing. What you did obviously worked, however.
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Old 06-23-2021, 10:50 AM   #12
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Old 06-23-2021, 03:37 PM   #13
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Well I got up this morning and itís cooled off due to pouring rain lol. The smell has mysteriously disappeared. Iím going to poke around under the sink to see if I have one of those relief valves. Iím pretty sure I donít. Iím sure it has a roof vent.
By any chance, do you remember what you had to eat the day before the mysterious smell appeared?
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Old 06-23-2021, 05:55 PM   #14
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I strongly suspect the vent you found was the AAV for the grey tank, in line with the washer/dryer. Fresh tank vents are not typically found extending inside the coach, but rather are located at the top of the tank itself. The fact that you leave the grey tank open when doing wash does not necessarily eliminate the grey tank from producing odors as the foul air rises if warm and tries to vent out the plumbing. What you did obviously worked, however.


Yeah, except for the ďair gap/ventĒ appears to be in the water supply lines as opposed to drain lines and it comes up around the supply lines. Although, it may just be the type of pipe used, and since I canít readily identify the actual connection because it is hidden under a bunch of sealer, Iíll never be sure until I get ahold of an REV tech. That said, as you said, the bleach running through both tanks did in fact resolve the problem.
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