Fresh water won't fill more than 2/3

[raj]

I had this same type of problem with my Micro Minnie trailer. Looking from the inside, I found where the fill hose and air hose both went under the flooring and into the fresh water tank. The hole where they entered the flooring was very small, but I was able to barely get my hand down in there. Once under the flooring, I felt around and followed the tubing, finding a kink in the air hose line. I fixed it by using a larger piece of tubing, sliding it down the air hose line (after first detaching the line from the outside fixture), and positioning it over the kink to help hold the line straight. Basically, a stint! It has worked well for many years and I have only once had the problem again. When it happened again, I felt for my stint and found it had slid. Positioning it over the kink again, solved the problem.