My 2010 F 150 was doing the exact same thing a year or so ago. It would always
eventually start up, but began to kill at stop lights, and would the exact same thing when
filling with gas.
The problem was caused by me overfilling the gas tank. The owners manual states not
to force fill the tank after the nozzle kicks off the first time. What happens is liquid
gasoline backs up and enters the canister, destroying it. Raw gas is then sucked into the
EVAP purge valve ( on the top drivers side of the motor) and destroys it. During
operation the vehicle will automatically go into text mode and try to pull a vacuum on the
fuel tank to see if there is a leak. This causes obvious problem is there is a malfunction
with the purge valve and it keeps trying to pull a vacuum. I've seen F 150 gas tanks
collapse like a beer can from the vacuum placed on it by the valve. You can try to
change the purse valve yourself, it is not hard and easy to remove and replace.
Hopefully the canister, used to remove gas vapors, has not been damaged.
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