Unfortunately it sounds more like a leak than a vent problem. The vent is on the roof. You might try going up to the roof and checking to see if the vent pipe has dropped down a bit into the tank. That usually gives you a smell in the coach however as the gasses vent through the toilet in that case.
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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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