Good Sam Club Open Roads Forum: Sewer Smell In Trailer - Under Sink Vent Repairs?
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 > Sewer Smell In Trailer - Under Sink Vent Repairs?

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Kampfirekid

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Posted: 07/19/10 03:34pm Link  |  Print  |  Notify Moderator

This weekend we experienced the strong sewer gas smell in our trailer. I immediately made sure there was water in the toilet, ran water in the sinks to fill the traps, and thought that would take care of it. It didn't. Then, I closed the grey water valve as I figured the gas must have been coming directly from the sewer through the grey tank. That probably helped, but I'd like to find the culprit.

As it turns out, I suspect the air conditioner running created a negative pressure with all the doors and windows closed. The only place to pull air would be through a vent. The only vents are in the plumbing lines under the kitchen and bath sinks. After all the problem troubleshooting, the DW said she smelled a really stong odor under the kitchen sink. That is where I found the vent. But, what o do? The top doesn't appear to come off. The p-trap is between the sink bowl and the vent, so no matter how much water goes down the drain, we'll still have issues.

I'd like to be proud that our trailer is sooooo air-tight that we need to pull air from the vent when the A/C is on, rather than a leaking seam in the trailer, but I'm sure that's not so. If there is a diaphragm in the vent under the sink, then how do I get at it if the top vent cap won't come off?


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robbie69

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Posted: 07/19/10 03:49pm Link  |  Print  |  Notify Moderator

try cracking a vent or window when running the air. i usually crack a vent since it's high and hot air rises.


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rav

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Posted: 07/19/10 04:08pm Link  |  Print  |  Notify Moderator

the vent should screw off. it's an air admittance vent (Mechanical Plumbing Vent) that allows air to be drawn into it - one way -so the water will drain. sounds like the diaphram in it is going bad, when mine when out we had the same problem. i got 2 at lowes, one to fix the problem and one to put in the tool box. part I found at lowes
Keeney Mfg. Co. Black Plumbing Vent
Item #: 24372 | Model #: 85539K


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mbutts

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Posted: 07/19/10 04:30pm Link  |  Print  |  Notify Moderator

The cap (on the roof of the trailer)on the vent pipe on my trailer got knocked partially off when I was removing the cover in the spring. This blocked airflow and stunk up the inside. Snapping it back in place fixed it.


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Admiral

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Posted: 07/19/10 05:46pm Link  |  Print  |  Notify Moderator

rav wrote:

the vent should screw off. it's an air admittance vent (Mechanical Plumbing Vent) that allows air to be drawn into it - one way -so the water will drain. sounds like the diaphram in it is going bad, when mine when out we had the same problem. i got 2 at lowes, one to fix the problem and one to put in the tool box. part I found at lowes
Keeney Mfg. Co. Black Plumbing Vent
Item #: 24372 | Model #: 85539K


I agree vehemently. A quick temporary fix (and test) is to attach a couple of layers of sandwich wrap around the air vent under the sink and rubber band it on. This should stop the smell until you get a replacement and won't harm anything in the plumbing. Just make sure the adjacent sink trap doesn't go dry in the mean time or you may recreate the odor.


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philhoey

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Posted: 07/19/10 06:10pm Link  |  Print  |  Notify Moderator

When was the last time you completly cleaned out the tank. If there is solid build up in the tank it cover the bottom of the vent tube and the gas has no where to go. Or can you tell of the vent tube and 'sunk' down into the tank thereby sealing off the bottom causing the same problem - no where for the gas to vent except into the trailer.


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dalenoel

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Posted: 07/19/10 06:24pm Link  |  Print  |  Notify Moderator

rav wrote:

the vent should screw off. it's an air admittance vent (Mechanical Plumbing Vent) that allows air to be drawn into it - one way -so the water will drain. sounds like the diaphram in it is going bad, when mine when out we had the same problem. i got 2 at lowes, one to fix the problem and one to put in the tool box. part I found at lowes
Keeney Mfg. Co. Black Plumbing Vent
Item #: 24372 | Model #: 85539K


At $5.59 each I think I'll get one as a spare before we go out next week.


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javaseuf

California's Gold Coast

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Posted: 07/19/10 10:12pm Link  |  Print  |  Notify Moderator

And BTW, a RV roof air has no air exchange between the inside and outside of the living space so running it will not produce a "negative presure" condition.





Kampfirekid

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Posted: 07/20/10 08:28am Link  |  Print  |  Notify Moderator

javaseuf wrote:

And BTW, a RV roof air has no air exchange between the inside and outside of the living space so running it will not produce a "negative presure" condition.


I see your point. I wonder why we had air coming into our trailer through the A/C grilles (exhaust side, not intake) when it was windy the other night (A/C was not on)?

javaseuf

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Posted: 07/20/10 06:10pm Link  |  Print  |  Notify Moderator

Could be that some insulation tape in the upper unit has come loose.

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