Fuel vapor leak....simple. find and fix the leak and you will be rolling again..In some cars it's as simple as a new gas cap.. or as hard as a Jeep Grand Cherokee with having to remove the front bumper to get at the charcoal filter
I'm at an age where every time I go to the hospital and they ask what my name is I tell them FORD... Of course they inquire about the difference between FORD and my true name. I just tell them I there as a FORD --- Fix Or Repair Daily ---.. I'm in the hospital as much as I'm out.... Hence; FORD..