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Old 06-02-2015, 07:37 PM   #1
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Where is that smell coming from???

Need Help, It stinks all up in here.

2007 Georgie Boy Pursuit.

Drained the black tank and then drained the Grey tank both tanks empty. Hit the road for home and not long into the trip we get a bad sewer type smell coming into the coach.

We have had this problem a few times before as well but never really found a solution to fix it. I replaced the roof top air vent with the whirly type hoping that would work but we are still having the issues.

Any good idea's other then nose plugs?

Thanks Much
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Old 06-02-2015, 07:42 PM   #2
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Quote:
Originally Posted by TireSpin View Post
Need Help, It stinks all up in here.

2007 Georgie Boy Pursuit.

Drained the black tank and then drained the Grey tank both tanks empty. Hit the road for home and not long into the trip we get a bad sewer type smell coming into the coach.

We have had this problem a few times before as well but never really found a solution to fix it. I replaced the roof top air vent with the whirly type hoping that would work but we are still having the issues.

Any good idea's other then nose plugs?

Thanks Much
Do you by chance have a washer dryer combo in your MH? It could be coming from a dry trap that was the issue with our Pace Arrow
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Old 06-02-2015, 07:43 PM   #3
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After dumping, did you put water and deodorizer in the gray and blank tanks? Make sure you don't have any vents or windows open and fans off as they can draw smells into the MH. And have some water in the toilet bowl.
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Old 06-02-2015, 07:48 PM   #4
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On our 2010 WGO Vista 30W, closing the bathroom fan stopped all odors. We believe the black tank vent discharge was being sucked back into the coach while underway. It may even be exacerbated by the MaxxAir vent cover.
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Old 06-02-2015, 07:50 PM   #5
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A couple of things: Do you have a washing machine, or plumbing for one? The drain has a trap, but unless water is poured down it occasionally it can dry out and allow odors in. Also, check under your sinks for odor. They usually have a 'cheater vent' that is a one way valve to let air in and keep gases from leaking into the RV. When they fail, they need to be replaced. A sniff in the cabinet usually tells the tale. Less than $8 at a home improvement store. Oatey 1-1/2 in. ABS PTC In-Line Cheater Vent-39012 - The Home Depot

Make sure that a small amount of water stays in the toilet bowl. It helps seal odors from the black tank.

In addition, do you drive with a rooftop hatch open? Side windows open? they can pull a large negative pressure into the cabin and often allow sewer odors to enter your RV.

Just a couple of things to check.
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Old 06-02-2015, 09:37 PM   #6
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And don't forget the shower drain. We had this problem after the coach had been unused for a long period and figured out that the shower drain P-trap had evaporated and was letting the smell in. Ran some water in the shower and the odor went away.
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Old 06-02-2015, 09:45 PM   #7
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Like Bob said, check the air admittance valves first. If they are ok it is possible that the roof vent is clogged. If that s the case then when you dump the tanks it will need to draw air from someplace and that someplace would be one or more of your drain P traps.
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Old 06-03-2015, 06:42 AM   #8
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Thanks to all for your idea's and suggestions. In Answer to some of your questions: No we do not have a washer/dryer on board the unit. I believe we did have the rooftop vent in the bathroom and galley open in transit. We also had the driver and passenger side windows open for fresh air. We did not put deodorizer in the black & grey tanks after dumping but there was water in the toilet bowl. I will check on the condition of the cheater vents today.

Again Thanks so Much for the help.
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Old 06-03-2015, 08:12 AM   #9
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When your driving down the road two things can contribute to the odor;

1) Air pressure differential can cause the tanks to pressurize just a tiny bit, but enough to push air through the drain pipes.

2) The liquid in the "P" traps can slosh around, the sloshing can drain the "P" traps enough to allow air flow, or slosh around and let little air pockets pass the "P" trap.

Try this:

a) Run water in ALL drains before hitting the road, shower, sinks, washer, etc. I do the toilet a little different, see below.

b) Put a table spoon of cooking vegetable cooking oil in each of the drains. This will reduce the sloshing and evaporation inside the "P" traps.

c) Place a drain stopper in all the sink drains. This plugs the drain and is good in case something rattles around and falls in the sink while traveling.

d) I flush the toilet to remove all the water in the bowl. I then put a couple table spoons of Vegetable oil in the toilet bowl, enough to cover the valve about 1/8 inch deep. This provides a good seal and will help lube the toilet valve.

Unless yo have a broken pipe, this should resolve any odors that somehow get into the coach while on the road.
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Old 06-03-2015, 09:38 AM   #10
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b) Put a table spoon of cooking vegetable cooking oil in each of the drains. This will reduce the sloshing and evaporation inside the "P" traps.
My good god, this is brilliant. Thanks for sharing this one.
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Old 06-03-2015, 09:52 AM   #11
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Quote:
No we do not have a washer/dryer on board the unit.
And hopefully if the rig is plumbed for one, the hidden trap is capped.

Quote:
I believe we did have the rooftop vent in the bathroom and galley open in transit. We also had the driver and passenger side windows open for fresh air.
That could easily suck sewer gas from the rooftop vent into the coach. When we have a roof vent open I find that air flows IN the roof vent and OUT the driver or other open window. We can drive with the front-most roof vent open just fine, but if we open the one in the bedroom or the throne room, we will get sewer gas inside while driving.
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Old 06-03-2015, 02:28 PM   #12
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We had this but since we started adding chems to the grey water tank as well as the black tank we no longer have this problem.
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Old 06-03-2015, 03:02 PM   #13
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Quote:
Originally Posted by TireSpin View Post
Need Help, It stinks all up in here.

2007 Georgie Boy Pursuit.

Drained the black tank and then drained the Grey tank both tanks empty. Hit the road for home and not long into the trip we get a bad sewer type smell coming into the coach.

We have had this problem a few times before as well but never really found a solution to fix it. I replaced the roof top air vent with the whirly type hoping that would work but we are still having the issues.

Any good idea's other then nose plugs?

Thanks Much
Give this product a try. Not sure if it's on Amazon.ca but there are dealers in various places (Google Happy Campers). Use as directed and it is by far the best, most economical product I have come across.

http://www.amazon.com/Happy-Campers-...=Happy+Campers
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Old 06-03-2015, 04:22 PM   #14
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Something that happened to us one time was that there was a small piece of toilet paper that was stuck in the rubber seal on the sliding valve for the toilet. This allowed the standing water in the toilet to drain and provided just enough of an air gap to allow sewer gas into the bathroom.

Mike
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