This is what I have been dealing with for the past few days. Started with tracing down a fuel leak and ended with replacing the sanitation line from the aft toilet to the holding tank. While looking for the fuel leak I found the line had been destroyed by fuel that run down the stringer next to the line. There was no saving the line so I removed it and replaced with a better grade. Thought you might like to see the condition of the line inside and out. I was amazed that fuel can eat a rubber hose and I have always heard about the urine rocks. Here is proof they exist. Boat smells so much better.
Found the fuel leak by the way. It was a bad fitting on the fuel lift pump. I have Lehman 135's and I understand the fuel lift pumps have been an issue with these motors.