Thanks for the answers so far. Here are the answers to questions posed so far.
1.It could also be something like this that has failed, and needs to be replaced.
Under Sink Vent
I have one of those under the half bath sink that goes to the same vint pipe....how would I be able to tell if it has failed?
2 Is the smell a "sewer" smell or an "ammonia" smell? Different fixes for each.
Mostly sewer with a slint tinge of ammonia. Since the oder started Thursday, there has been no decrease in refrigerator opeations.
3 First of all I would check the pilot lights/stove knobs on the stove. I had one bumped on and thought it was the gray tank smelling.
Checked that out upon your recommendation and all appears normal.
4 Are all your p-traps filled with water? That water can evaporate and allow smells up thru the drain.
If all that checks out ok. It could just be a stinky gray tank.
The oder is not coming out of the sink drain as I would expect if the p-trap was empty. (last night I closed the drain and filled the sink with water in case this was the case...again no joy)
Did a complete back flush of the gray tank this morning...again no joy
5. Also, a telltale sign that a vent is blocked is that the appropriate tank drains slowly or is struggling to drain when dumping. Do you have this problem?
Wife uses the kitchen sink the most and has not complained about slowing running sinks.
Thanks for all the help so far. Please keep throwing stuff against the wall....something might stick.
