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sc180b · 05-23-2011, 11:10 PM

Not sure what make coach you have, but I have had the same issue in my last two motorhomes. I tracked the problem down in both of them to the in house syphon style vent the manufactures use on the drain lines for the sink in the cooking area. This style vent is spring loaded and opens when water goes down the waste line. The smell is from the vent not closing completely allowing odor from the gray tank to come back up and out of vent. The vent is normally located in the cabinet under the sink. The vent is easly replaced and should thread off, no cutting or glueing involved.
Pope

05-23-2011, 11:10 PM	#1
sc180b Junior Member Join Date: Apr 2009 Posts: 12 Likes: 0 Liked 0 Times in 0 Posts	Re: Sewer smell while driving Not sure what make coach you have, but I have had the same issue in my last two motorhomes. I tracked the problem down in both of them to the in house syphon style vent the manufactures use on the drain lines for the sink in the cooking area. This style vent is spring loaded and opens when water goes down the waste line. The smell is from the vent not closing completely allowing odor from the gray tank to come back up and out of vent. The vent is normally located in the cabinet under the sink. The vent is easly replaced and should thread off, no cutting or glueing involved. Pope