Maybe this is already solved, but I thought I'd add my experience for prosperity. Our nanny had the same issue with her 2011 Fiesta. The dealer refused to look at it several times and just kept giving her the run around. I pulled the lines off from the charcoal canister to the purge valve, and up to the vent by the filler neck. I could blow through the purge valve with the key off so that seemed to not be the problem. I could not blow through either line going to and from the purge valve. Each of these lines has an inline "filter" in it that I found to be plugged up. I could see light through both filters, but I could not blow through either one. My experience with the fine mesh (in other applications) in these filters is that if it ever gets wet it plugs up and won't dry out. Therefore I removed these two "filters" and just plumbed it back up without them by cutting off the ends that were formed onto the filters. Now it fills with fuel just fine. I left the filter on the end of the line up by the filler neck to avoid drawing in dirty air or water, but I cannot figure out why these two other filters are critical. I guess they protect the purge valve under some scenario when you get fuel or water or something in these lines. It seems you can only buy the whole assembly (tubes, purge valve, etc.) to replace these. This setup is $180 so I figured I'd try it without the filters. If it ends up wiping our the purge valve I'm no worse off. It it doesn't she saves $180. I did tell her to be careful topping the tank off too much to avoid the risk of filling these tubes and the canister with fuel. This car is probably not going to be too much longer for this earth anyway..... Hopefully this helps someone else save a few bucks.When i try and put gas in my Fiesta the pump shouts off quick takes a long time to get gas in car? Tried other pumps and does the same .Please help.