I fixed my black water tank
 

I pulled my black water tank and found out where it was leaking. I used the info from Tim L from this link
https://www.hilotrailerforum.com/f27/...2o-tanks-2979/
posting number 6. Thanks Tim L

These are the steps that I took.
1. Drained Black and gray water tanks.
2. Removed the 4 bolts that hold the 3" waste valve to the tank.
3. Removed the cover for the p-trap and undid p-trap.
4. Turned off water supply and unhooked water supply line from toilet.
Removed toilet.
5. Unhooked the vent tube from the roof vent. Cut vent tube in two places.
6. Removed 4 metal trim pieces on shower pan.
7. removed black water tank.
8. Reinstalled in reverse.

The cause of the leak was the tank was sitting on the water line that feeds the outside faucet. Also found a screw in that water line so I cut the line and put a 90* in the line to keep it away from the tank.