why would car not start right after getting gas , no issue, battery year old.

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I drove an hour 65/ 70 mph and was almost out of gas stopped to get gas @ some place I always do , vehicle would not start. acted like battery was dying , turn over maybe twice would not fire, and then show sign of like loss of power . tried again / nothin. waited 20 min & started up like nothin happened 30 min later shut off again. same thing would not start . left it came back two hrs. later started up again like nothing happened drove 65 mph/ 70.45 min to store . turned off & tried to turn on came on? again came on ? like nothin happen hour later started, drove 20 min 65/70 * 20 min 30 /40 mph used short distance roughly 20 min a day later . no problem 40 mph Monday started off no problem 30 mph 20 min. & to 65/ 70 MPH 20 MIN THEN! In 4th Gear while shifting to 5th Began to buck & loose power no throttle power at all as no gas. Note : One two weeks prior to this I did loose my serpentine belt due to a faulty stationary fly wheel which had to be replaced But for two weeks I had no issue's what so ever! & the problem only was occurring when I shut off engine not while driving. I do hear a slight noise coming from gas tank as per pump maybe? engine turns over and gauges all seem to want to show & work but rough when try's to start but wont