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Is this a 2013 or 2014, you have listed both?
Also, what engine does the F150 have and did you loose throttle response where you had no engine RPM when you stepped on the gas, or...?
Does it restart ok?
How many miles on the truck?
The 5.0L we have not seen many problems with because Ford also uses that engine in the Mustang GT.The problem could be a sensor issue or a fuel pump issue (low fuel pressure). We have seen a few problems with the fuel level sensor. You may want to make sure there is fuel in the fuel tank.
Not really. Todays vehicles you need a code reader or scan tool to check for trouble codes in the modules to properly find the problem.
It is just an electrical motor inside the fuel tank. Electrical parts are prone to failing. We have had brand new vehicles have the electronic power steering rack and pinions lock up to where you cannot steer the vehicle and we have to replace the rack and pinion. I just mentioned the fuel pump, but we have had problems with the sending units on the fuel pump for the fuel level short out. But you just filled up the tank, so that can be eliminated. We have also had the vapor management valves stick open pulling fuel vapors to the engine causing lack of power. You can disconnect that hose to it and have someone start the engine and plug the port on the sensor and see if it will run. It is located on top of the intake manifold next to the throttle body. See the picture below.
With your truck having 20,000, and it being a 2014, it will still be under warranty and the tow to the dealership will be covered also.