Fuel fill diagram and explanation of how gas fill system works.

[chaz069]

Checked all of the related posts on this subject and no clear fix to the problem, short of removing the gas tank, cleaning the lines and filters. If I know what I am looking at and how it works it will make the diagnosis and subsequent repair easier. No luck with the local Ford dealer. How does this system work? Where are the filters or kickback valve(s)? Again any and all help would be appreciated. Thanks chaz069