This is a problem I had with my 2013 F150 and from what i have learned is a common issue with most ford models with this 'EASY FUEL" system.
This is the best way to get rid of that to my knowledge.
Here is some links to affordable products from amazon to help you perform this task:
WD-40:
https://www.amazon.ca/gp/product/B008BV7V7U/ref=as_li_tl?ie=UTF8&camp=15121&creative=330641&creativeASIN=B008BV7V7U&linkCode=as2&tag=mrdiyguy00-20&linkId=0cdd48ff1b50fdac7273a2445abbc6ea
Capless gas tank funnel:
https://www.amazon.ca/gp/product/B00S66BUAE/ref=as_li_tl?ie=UTF8&camp=15121&creative=330641&creativeASIN=B00S66BUAE&linkCode=as2&tag=mrdiyguy00-20&linkId=6142f56ec9ca5f21329f4d1cdafb893f
Air duster:
https://www.amazon.ca/gp/product/B007Z7OK3Y/ref=as_li_tl?ie=UTF8&camp=15121&creative=330641&creativeASIN=B007Z7OK3Y&linkCode=as2&tag=mrdiyguy00-20&linkId=eac64fa28f0a1d6855411d6ea3ab0a90
Code reader:
https://www.amazon.ca/gp/product/B08BFMRFHS/ref=as_li_tl?ie=UTF8&camp=15121&creative=330641&creativeASIN=B08BFMRFHS&linkCode=as2&tag=mrdiyguy00-20&linkId=24b941b74ad5bd20e4087e5b831bb698
To try amazon prime free for 30 days (2 day shipping free):
https://www.amazon.com/tryprimefree?ref_=assoc_tag_ph_1427739975520&_encoding=UTF8&camp=1789&creative=9325&linkCode=pf4&tag=mrdiyguy0c-20&linkId=76d1996f75cee8e7b760b789d72d1320