I have a 2008 Hyundai Elantra, 232,000 miles on it. Just recently and happened twice already, Last week and two days ago. I filled my tank up started the car and it would stall out. I started again and I would have to hold my foot on the gas peddle a little and when I let my foot off, it feels like it's gonna stall again but doesn't. Afterwards the car is fine and goes about it's business.
This is a classic symptom of EVAP system failure. EVAP system stores fuel vapor during fueling and then burns it when you start the engine. It your check engine light on? If so, chances are you have a code stored for the purge valve. High failure rate on these on Hyundai. See this post on EVAP systems