You may have overfilled the fresh water tank (there is only one), and the overflow hose is leaking onto the floor, rather than out through the exterior sidewall next to the inlet.
If that is not the problem, then you need to find the leak. Find the tank - it will be either under the kitchen sink, or under one of the dinette seats on the street side. See if it is leaking onto the floor. If not, follow the outlet plumbing line to the water pump. Is the pump, or the inlet or outlet hose, leaking? If not, follow the outlet hose - which branches in many directions at this point. You get the idea - trace it until you find the leak. At that point, the fix will be easy.
I don't think we can help much without more info. What model TM do you have? That tells us where the critical components are located.
Bill
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