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Old 06-05-2013, 10:20 AM   #8
Motor31
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Join Date: May 2005
Posts: 2,130
One other possibility. Your black tank vent tube might be blocked or dropped down into the tank. That tube is supposed to vent the tank and stop buildup of gasses to prevent the odor from entering the trailer.

As to the grey line, you can leave it open. You can create a natural gas block by simply putting a hump in the sewer hose. That then is a "P" trap like the one under the sinks and shower. Those already should be blocking the entry of gasses into the rig as well.
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Mike Nancy and the fuzzies
Fulltiming since June 2004
Volvo 660 MH tow vehicle
2005 MS 38RL
2007 Saturn Ion "toad"
2010 Gold Wing "piggyback"
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