Some rvs might lack the grey tank the black tank contain all the dirty water from the kitchen sink toilet and showers.
Black water tank leaking.
This may or may not cause an actual tank leak.
In addition to human waste the rv black tank also collects water used to flush the toilet and of course toilet paper.
If you see the water start to leak under your rv then you ve found the culprit.
The black water tank collects both liquids and solids so caring for it is a bit different than your gray tank.
The first sign there is a problem will be when you remove the black cap in preparation to drain your waste tanks.
Also shows how to adjust the cable actuator so you get a valve to com.
Which by the way.
The next step is to determine which of the dump valves is leaking.
Ion a black water tank it could simply be leaking from around the 3 inch pipe from the toilet or the smaller vent pipe requiring nothing more than new sealant.
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.
It holds dirty water from your toilet.
If a vent pipe were to drop it usually drops into the tank through a rubber tank fitting.
How to repair your rv black water and gray water dump valves instead of replacing them.
The biggest concern with black water tanks is waste collecting along the tank walls and not draining when you empty into the rv dump station.
Another giveaway is the presence of odors.
If you re greeted with about a half gallon of waste water as soon as you loosen the sewer cap then one of your dump valves has lost its ability to contain the water in the tank.