It takes fuel normally. I have tried not topping it off and leaving it a few gallons short and it still did it. If I go really short, like a half tank, then it doesn't happen.
Replace the evap vent valve in the back of the car. Its 4 bolts and its located on the back of the canister. The valve sticks and causes a small vapor lock.
This is the same for almost ANY ecoboost car/truck from what ive seen. I had it happen on my Fiesta ST, my brother in law's Fiesta(non-ST) and now my wife's Edge Sport. The symptoms are literally a hesistation/stall at a stoplight after filling the tank.