Grey tank odor, but only when starting
2014 Tiffin Phaeton.
Every time when we start heading down the road, we get a strong (unpleasant) smell. We both think it reminds us of onions, but that's the nearest we can get to describing it.
Once we have been driving an hour, we seem to lose the smell. We can park, everything is good. Stay parked for several days, no issues. Start the rig up, start driving, ONIONS AGAIN!! I do have 2 vent connections on the top of the rig, but they have Tees on them, so its hard to tell if they are ok.
Sometimes we have the same faint smell if we have been out of the coach all day, but it usually is not there. I have tried doing multiple things to clean the tank, but still the smell comes back. (It does seem to be coming from the kitchen sink area.)
I'm trying to figure out what the heck is going on that we get the smell so strong when we start driving.
Anybody have any ideas? I considered changing the Hepvo valve, but it only really smells when we start driving, and I don't want to start shotgunning parts at it..
2014 Tiffin Phaeton 40 AH This one will be the last rig.
2006 Tiffin Phaeton 40QDH "Our first RV, and hopefully the last"