Thought I would also throw my two cents in on this topic.
I have a 2010 SE and got the "Check Fuel Fill Inlet" Message. Followed the instructions in the manual, used the fuel filler tube to poke any loose debris out of the gas cap, and the message went away. A month later, I got the message again, however it went away on its on during the same trip. Few days after that, Check Engine Light came on, and stayed on. Poked around this and other forums and decided to replace the purge control valve mentioned in the above quote. It was $54.00 + tax for me at my local ford dealer. I didn't have the tools at home to install it so I cannot speak to how easy/hard replacing the part would be, but my longtime mechanic popped it in free of charge; took them five minutes. Have had no issues since.