Originally Posted by LittlePM
I have been told by many campers for years FIRST you NEVER leave your tanks open the fumes can cause health problems.
I also keep my valves closed (both gray and black) dumping only when full (or we are leaving hookups) because leaving them open allows the solids in both type of tanks time to dry out and become harder to flush out.
You should never "smell" tank odors inside the camper even with the valves open since the tanks are vented to the roof and the water above the toilet valve and water in the gray traps keeps fumes from entering the camper.
Fumes in the camper at any time (valves open or closed) means you should find out where the leak is. Many times "sloshing" during travel will empty the shower trap and allow (stinky) gray tank fumes to enter via the shower drain. Simply add a cup of water to the shower pan to stop the smell.
Also using the vent fan when using the "facility" can draw odors (valve open or closed) up through the toilet when flushing with a nearly full tank. Shut off the fan when flushing and turn it back on when you are done.
Lou and Laura with Bella - German Short Hair Pointer
2008 GMC Sierra 2500HD Crewcab SB Allison Duramax
2010 Flagstaff 8526RLWS - Superglide 3300
HAM CALLSIGN - KC3FFW