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Old 05-18-2022, 05:55 PM   #1
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Sewer Odors

We have a 2019 Pacearrow LXE that we bought new. For some time now we notice the sewer odor but only while the vehicle in in motion. Even if we are parked at a campsite with a nearly full black tank, no problem. Within a few minutes of driving we start getting odors. The roof vents are closed and there is always some water in the toilets to reduce chances of odors coming past the seals. Any ideas would be greatly appreciated!
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Old 05-19-2022, 04:43 AM   #2
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Here are some options for this odor.

1. You may be experiencing odors from the Air Admittance Valves -AAV- valves located under the sinks. Replacements can be found at any hardware/big box store and are fairly inexpensive. We had the same problem until I changed the AAV valves. No more odors.

2. Use some type of odor control material for your black tanks.

3. Use the same odor control material for your grey tanks.

4. Fill both black and grey tanks about 1/2-1/3 full, put in your favorite odor control/cleaning agent, then drive at least 1 hour to get the tanks agitated. Drain when you get to your campsite.

What do you mean by the vents are closed?
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Old 05-19-2022, 07:11 AM   #3
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If the trap for the washer/dryer is not filled with water, the foul odour may be coming from the gray water tank. That tank can smell pretty bad. The motion of the coach can cause reduced air pressure inside which can draw air from any trap that is not full.
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Old 05-19-2022, 03:58 PM   #4
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Quote:
Originally Posted by txcpl View Post
...

2. Use some type of odor control material for your black tanks.

3. Use the same odor control material for your grey tanks.

...
If you do this, you are just masking the odor, and swapping the offensive odor for a less offensive odor....but you still have a problem.
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Old 05-19-2022, 06:03 PM   #5
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Old 05-22-2022, 05:32 PM   #6
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Originally Posted by txcpl View Post
Here are some options for this odor.

1. You may be experiencing odors from the Air Admittance Valves -AAV- valves located under the sinks. Replacements can be found at any hardware/big box store and are fairly inexpensive. We had the same problem until I changed the AAV valves. No more odors.

2. Use some type of odor control material for your black tanks.

3. Use the same odor control material for your grey tanks.

4. Fill both black and grey tanks about 1/2-1/3 full, put in your favorite odor control/cleaning agent, then drive at least 1 hour to get the tanks agitated. Drain when you get to your campsite.

What do you mean by the vents are closed?
As it is a new coach, the AAV's should be fine however I haven't actually checked them.

We always use additives in both the grey & black tanks for breaking down waste and odor control.

The roof vents & fans are always closed while traveling to prevent negative pressure from pulling odors out of the waste tanks especially the grey tank since the "P" traps often lose all the water meant to seal them off.

Thanks for the imput though!
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Old 05-23-2022, 04:50 AM   #7
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I had the same issue with my Monaco. After checking to be sure the vent line was good I replaced the vent cap with a Camcorder Cyclone and it solved the problem
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Old 05-24-2022, 05:10 PM   #8
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Your coach is probably going into a negative pressure when driving down the road. Allowing some tank gasses to come up through the traps. Get one of these add-ons, for each vent stack, to reduce the pressure in the tanks.
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Old 05-31-2022, 06:20 PM   #9
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We have a 2016 Excursion 33D which was the model name just prior to changing to Pace Arrow. If our coach has not been used for awhile, we have the same issues when driving. After using all the sinks, shower, dishwasher and washer and allowing some water down each drain, the problem disappears on the next driving day and stays fixed for the duration of trip. Only after storage and the water evaporating from the drains do we get the problem on our first driving day due to negative pressure. Now if we remember, we just run water in every drain before we leave on our first driving day and the problem is always solved!
Hope this works for you!
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Old 05-31-2022, 06:34 PM   #10
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Quote:
Originally Posted by Jschuhrke View Post
We have a 2019 Pacearrow LXE that we bought new. For some time now we notice the sewer odor but only while the vehicle in in motion. Even if we are parked at a campsite with a nearly full black tank, no problem. Within a few minutes of driving we start getting odors. The roof vents are closed and there is always some water in the toilets to reduce chances of odors coming past the seals. Any ideas would be greatly appreciated!
As others have mentioned donít overlook the gray tank; believe me the smell from the gray tank fermenting is worse than the black tank and it will come out of the kitchen sink drains while the vehicle is in motion. Some people leave their gray tank drain valve open while they park (bad practice) and food waste accumulates and rots. It would be good practice to use rv tank cleaner, flush it out and start over to see if the smell goes away.
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