The problem is if the black tank is overfilled in your drawing it will overflow into the gray water tank before it starts to show up in the toilet bowl.
Rv gray water tank overflow.
There are three tanks in an rv.
You show the black and gray tanks sharing the same vent stack.
You should dump your rv grey water holding tank for rv when it s full.
If all else fails i have a small six gallon tote n store that i picked up from amazon that i drain the gray water into if need be.
Some rvs might lack the grey tank the black tank contain all the dirty water from the.
This is also great for cleaning your sensors.
Remember if you re connected to a line and the washer and dryer are on you ll want to keep the grey water tank valve open or you may get water bubbling out of your drains.
Fill your gray tank at least 1 2 full of water then add your cleaner of choice.
The second is a grey water tank that holds dirty water from your kitchen sink and shower.
The last one is the black water tank.
When it is full the shower will quit draining as you found out.
Rv grey water tank overflow.
We still love our bathtub tho.
The vent may not be sealed on top of the tank.
Not sure how you would access it to check.
In this video we show you what happens when you forget to open the gray tank before draining the bath tub a flood in the rv.
This is best to do before you hit the road.
Driving will cause the soapy solution to slosh against the tank walls and eliminate buildup.
Just as with your black tanks you want to make sure you regularly empty and drain your rv s grey water tank though it s a good idea to drain it after your black tank all that relatively clean soapy water can flush your sewer hose of the truly icky stuff.
This now saves us on fresh water for not having to flush.
You need to redraw your diagram and show the gray tank vent connecting higher on the vent stack.
The best way to clean your rv s gray water tank is to let the rv do most of the work.
Ideally you should keep the valve closed and allow the tank to fill up before dumping it.
There is no drain on the grey tank except the drain valve.
It holds dirty water from your toilet.
I don t know if it is necessary to drop the belly to dry it out.