Solved my freash water inlet problem

A few weeks ago I posted asking if any one could figure why I couldn't get water to flow into my fresh water tank using a funnel with a short hose attached to it, but had no problem using a garden hose attached to a spigot.
I got all kinds of answers, but none that solved the problem.
Today I was winterizing the trailer and was at the pump which is located under a couch, and just happened to see the fresh water fill tubing behind it. ( I never knew it was there). Looking at it, I could see a hump in it where the factory put it over the small fresh water vent tube. It made it just high enough that it was a tad higher then the filler hole. The pressure of a hose from a spigot forced the water over it, but my gravity fill didn't and it just flowed back out of the hole.
Mystery problem solved !

jack L