my car starts but only runs couple seconds before shutting down.

Highway hesitation noticed few times in past. Ran outa gas.put gas in n it started on second try.drove hour parked. But let run for air for son.hour later he shut off dt cold n a noise.came got me.I tried but it only ran couple seconds n would shut down after few more tries it wouldnt do anything.man chkd for me said oil if any was very low added oil still same.he also said he didn't hear fuel pump kick in.said was his guess as he is not a mechanic n doesn't know alot about cars.yes i am a woman who knows only how to gas n go.it just caught up to me.lesson learned hard way.please help!thanks!