I have to be out of town on business most of the time. Wife filled up
her Santa Fe someplace a week or two ago and every since then, after she
adds more fuel, the car is hard to start and stalls if left to idle for
the first minute or two. After that it is fine.
I tried removing the gas cap, waiting a minute, then replacing it to
see if it had something to do with tank pressure but that did not cause
the symptom. I put fuel injector cleaner into the tank and filled it up
by adding 3 gallons and immediately after adding that little bit the
hard starting showed up for me.
It is fine at any other time.
I had replaced the fuel filter about a year ago.