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Old 07-31-2019, 12:54 AM   #1
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Getting a poopy smell after a couple days travel?

Hi All,
We bought our first motor coach last year, a Thor Windsport 29, and are on a learning curve. We drove from Indiana to Colorado and two days into the trip it started to smell. The toilet that is. We quickly dumped even thought it was only half (or less) full. And we had no more issues. It happened again last weekend! It was about 3/4 full and did not want to fight our way through the campground against the exit flow to dump. So we decided to do it on the way home. We were at the Mid Ohio Indy car race, awesome! By Richmond Indiana I couldn't stand it and had to dump it out. Neither my trailer or fifth wheel had this issue. What is the deal? The toilet bowl has water in it and I see no leaks at the base of the toilet. It's not as bad as an out house in the sun, but you can smell it. Any ideas?
Thanks,
Jay
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Old 07-31-2019, 01:00 AM   #2
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Look inside the cabinet under the bathroom sink: You may see what is called an air admittance valve. Make sure its screwed on tight (it is a one-way valve that lets air into the waste system but not out). It is also possible that there is something wrong with the valve and it may need to be replaced.
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Old 07-31-2019, 02:49 AM   #3
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Cool

Quote:
Originally Posted by beeryboats View Post
Hi All,
We bought our first motor coach last year, a Thor Windsport 29, and are on a learning curve. We drove from Indiana to Colorado and two days into the trip it started to smell. The toilet that is. We quickly dumped even thought it was only half (or less) full. And we had no more issues. It happened again last weekend! It was about 3/4 full and did not want to fight our way through the campground against the exit flow to dump. So we decided to do it on the way home. We were at the Mid Ohio Indy car race, awesome! By Richmond Indiana I couldn't stand it and had to dump it out. Neither my trailer or fifth wheel had this issue. What is the deal? The toilet bowl has water in it and I see no leaks at the base of the toilet. It's not as bad as an out house in the sun, but you can smell it. Any ideas?
Thanks,
Jay
. One possibility could be , the Odor is happening while youíre parked and leaving the black dump valve and the gray valve open at the same time. black valve should be shut prior to dumping. I leave gray valve open to sewer when parked
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Old 07-31-2019, 10:01 AM   #4
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We keep all valves closed until we dump. We also use a treatment called HAPPY Camper. It is an organic enzyme that has no perfume smell and it stops all smell in the black tank. So far it has worked very well.
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Old 07-31-2019, 11:58 AM   #5
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Was the overhead air vent in the bathroom open? It's possible that if the wind is blowing a little bit (and the seal in toilet bowl leaks): it could draw the gases from the tank upward into the room...
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Old 07-31-2019, 11:35 PM   #6
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Quote:
Originally Posted by RichS View Post
We keep all valves closed until we dump. We also use a treatment called HAPPY Camper. It is an organic enzyme that has no perfume smell and it stops all smell in the black tank. So far it has worked very well.
I second the Happy Camper treatment. We started getting a leftover smell about 6 months in, especially while in storage during the summer. Read about Happy Camper, tried it and never had another smell. Works great for us.
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Old 08-01-2019, 12:06 AM   #7
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Were do you get the Happy Camper? Looked on Amazon and it's not available.
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Old 08-01-2019, 12:25 AM   #8
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Here you go.

https://www.amazon.com/Happy-Campers...s%2C163&sr=8-3
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Old 08-01-2019, 12:26 AM   #9
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Guess we left out the "s". Sorry. Give it a try. It last a long time, don't have to use much. Good luck.
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Old 08-01-2019, 01:39 AM   #10
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I'll look for the check valve under the sink. It's strange that the roof vent is closed, it only happens after being on the road for a while, and there is water in the bowl. I don't think it's from the gray tank either.
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Old 08-01-2019, 01:43 AM   #11
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Quote:
Originally Posted by RichS View Post
We keep all valves closed until we dump. We also use a treatment called HAPPY Camper. It is an organic enzyme that has no perfume smell and it stops all smell in the black tank. So far it has worked very well.
Yes I wish I could leave the gray valve shut, wife loves to use the washer and dryer which requires the gray to be open as we only have a 40 gallon holding tank.
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Old 08-01-2019, 01:45 AM   #12
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I found my issue was simple to fix...difficult to find. It was suggested by Thor customer service to get on the roof, remove the vent cap and check the space between the vent pipe and the outer tube that contains the pipe. I found there to be no sealant between the two. Occasionally the black tank fumes would flow back down between the 2 pipes and get into the coach. I filled the gap with silicone caulk and have had no further problems.
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Old 08-01-2019, 01:45 AM   #13
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Quote:
Originally Posted by beeryboats View Post
I'll look for the check valve under the sink. It's strange that the roof vent is closed, it only happens after being on the road for a while, and there is water in the bowl. I don't think it's from the gray tank either.
There needs to be a good amount of water in the toilet bowl not just a little
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Old 08-01-2019, 01:48 AM   #14
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Quote:
Originally Posted by beeryboats View Post
I'll look for the check valve under the sink. It's strange that the roof vent is closed, it only happens after being on the road for a while, and there is water in the bowl. I don't think it's from the gray tank either.
. Just so you No most RVs donít have a P-trap for the shower only the the sinkís, this is why if you leave the black and the gray open together you can get the sewer smell from the black, just saying .
Of course I donít know how yours is plumb
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Old 08-01-2019, 02:49 AM   #15
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I agree with JamieGeek. The vent is the culprit. Remove it, clean it, check it for serviceability, and reinstall. Cheapest option, and I've seen a few rigs with the same problem.
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Old 08-01-2019, 01:10 PM   #16
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Wink

Not to make light of the problem, but you might also want to limit those trips to Taco Bell.
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Old 08-01-2019, 01:24 PM   #17
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I agree...

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Old 08-08-2019, 11:16 PM   #18
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Quote:
Originally Posted by Miramar Owner View Post
I found my issue was simple to fix...difficult to find. It was suggested by Thor customer service to get on the roof, remove the vent cap and check the space between the vent pipe and the outer tube that contains the pipe. I found there to be no sealant between the two. Occasionally the black tank fumes would flow back down between the 2 pipes and get into the coach. I filled the gap with silicone caulk and have had no further problems.
Thanks! I bet that's it. It only happens when you start rolling down the road a while. Either that or I get one of those weather vane vents that pull the fumes out with the wind.
j
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Old 08-10-2019, 06:46 PM   #19
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Quote:
Originally Posted by Miramar Owner View Post
I found my issue was simple to fix...difficult to find. It was suggested by Thor customer service to get on the roof, remove the vent cap and check the space between the vent pipe and the outer tube that contains the pipe. I found there to be no sealant between the two. Occasionally the black tank fumes would flow back down between the 2 pipes and get into the coach. I filled the gap with silicone caulk and have had no further problems.
DId you happen to snap any pics while you had the cap off to show what you did??
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Old 08-10-2019, 08:01 PM   #20
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Over the years we've had problems with black water tank smell at times.
Things that we found to contribute to the smell are:
  • Full black water tank.
  • Back water tank left too long without emptying
  • High ambient temperature
  • Only one application of odor eliminating chemical
  • Driving with the front windows open
  • Bad seal (no water) in the toilet
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