Sewage odor

These Camco vents work great, it's what I have. Camco Cyclone vent

Pour water down all the drains. P-traps evaporate. Especially fast in hot weather in an RV just sitting empty and not being used.

And yes 'some' RV bathroom sinks drain into the black tank.

My bathroom sink drains into black tank and if I don't use that sink everyday during the hot weather the p-trap water evaporates. I know when I start smelling sewer odor.

Most likely "P" traps have dried out setting in storage.

X2 on the air admittance valve. Replaced ours when the rig was fairly new and the odor was gone

Pour some water down each sink and shower drain to assure the p traps have water in them so they can do their job of preventing odors from entering the house. Check to make sure toilet is not loose and making a good deal.

pour some water in the toilet see if it leaks out, seal could be bad and do all the above good advice.

if it was your maiden trip it could be that you have no water in the pee traps and the smell is coming from the grey tanks

Check under kitchen sink and bathroom sink for an Air Admittance Valve

They are installed (hand tight) downstream of sink 'P' traps. They OPEN when you drain grey tank so water doesn't get sucked out of 'P' traps

IF they don't close then grey tank odors can come back inside RV......grey tank can smell nasty---worst then black tank


Home Depot/Lowes/Ace Hardware........