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Old 03-14-2012, 07:27 PM   #15
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Whatever type of seal at the bottom of the toilet bowl, it should seal well enough to hold water. Leaving some water at the bottom of the bowl will insure that no black tank gasses are coming back into the trailer from the black tank. If they are, there should be bubbles in the water at the bottom of the bowl.
If your gray tank valve is left open, and there is no "U" in the slinky hose, gasses can come in from your sewer connection unless you shut the gate valve on your gray tank. Even with that valve open, the "P" traps, if they have water in them, should keep odor out.

We have never had that problem either in our Caravel or our Excella.
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Old 06-11-2012, 02:34 PM   #16
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Angry Mystery Black tank odor

Quote:
Originally Posted by Jim Foster View Post
Whatever type of seal at the bottom of the toilet bowl, it should seal well enough to hold water. Leaving some water at the bottom of the bowl will insure that no black tank gasses are coming back into the trailer from the black tank. If they are, there should be bubbles in the water at the bottom of the bowl.
If your gray tank valve is left open, and there is no "U" in the slinky hose, gasses can come in from your sewer connection unless you shut the gate valve on your gray tank. Even with that valve open, the "P" traps, if they have water in them, should keep odor out.

We have never had that problem either in our Caravel or our Excella.

Thanks Jim .... I did find that when the a/c was on high for some time there was a negative pressure in the stream. If I hit the pedal it would immediately pull in sewer gas into the a/c and blow it front to back from the a/c, no smells anywhere else (closet, under a/c, bathroom).There must be a way it's pulling from the exhaust vent pipe, since I added a 2 foot extension and the problem stopped immediately (can't drive down the road that way). For the naysayers, it's hard to argue it can't happen, standing there with the a/c blowing in my face, flush the toilet and instant stink coming from the a/c , not from the toilet or bath area, and I mean instant, like a shot out of a cannon. If I shut off the a/c and flush nothing smells, wait 3 minutes and start the a/c up again and clear air.
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Old 06-11-2012, 05:20 PM   #17
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Just a wild guess, maybe you have a leak in the vent pipe in the small "attic" space between ceiling and roof. A/C may be pulling from vent in the same area? Or the bad gasket on the vent allows fumes to go into this space above ceiling.?
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Old 06-11-2012, 05:24 PM   #18
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Also, if you think the wind is causing this, maybe you could try parking the trailer in another space with the wind from the front? I had a sob motorhome that would pull fumes into it from a vent pipe close to the bath ceiling vent. The fix was a gadget on the vent pipe that turned with the wind so vent fumes could not go into skylight vent.
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Old 06-11-2012, 09:55 PM   #19
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Also, if you think the wind is causing this, maybe you could try parking the trailer in another space with the wind from the front? I had a sob motorhome that would pull fumes into it from a vent pipe close to the bath ceiling vent. The fix was a gadget on the vent pipe that turned with the wind so vent fumes could not go into skylight vent.
Actually that gadget made it so the wind could not blow into the tank to pressurize it.

Sounds like you need to check that sewer vent pipe cover gasket.

Close to or even with the top of the vent should be right if you have the same type of vent that is on my trailer, the vent is only about 3" high on mine.
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