1991 Dolphin Water Leak

[David Aranda]

There is a leak somewhere above the black water tank and the restroom floor by the toilet not the shower but only when I turn on the water pump. It seems to me that it might be the water line from the pump to below the toilet floor. The floor inside the toilet floor gets all wet and water drips from behind the black water tank. I would think that I would need to remove the black water tank to get to the leak. If I'm right how can I do this with the least amount of damage? The restroom is at the rear of the vehicle. 

[MaineJed]

Does it happen when you’re not using the pump and just hooked up to an outside water source? There should be a water line under your sink cabinet that runs to your toilet, it’s hidden under some trim that might be a good place to look also in the bathroom closet under neath the closet floor where your propane tank should be behind that should be a place to access a water line. Have you turned it on and crawled underneath to see if you can find it?