Why does my car stall after getting gas ? on 2004 Mitsubishi Endeavor

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When I get gas..(No matter how much) my car stalls when i finish feeling up..It will start up right after a second time.. I took a mechanic with me & he never saw this happen in his life. They did chk the fuel line & the Evap but they were fine...
(1) Answer
Evap problem, scan test system or just restart and drive on. Could be a costly repair.
Fuel is entering evap system momentarily flooding engine. Try pumping slower. All this is my guess!