[1995oldsaurora]

helo everyone,,,,is it normal to hear a slight hummm from the fuel pump.when i first bought my 95' about two years ago it suddenly started making a noticeable humming sound..shortly after i needed to replace the pump..all was fine until i had the recall done..after installing the new fuel rail they got dirt or something in the injectors..they had the car most of the day cleaning the injectors out..the mechanic took the car for a 50 mile test drive to make sure all was ok..when i picked the car up,i was about half way home and the low fuel warning came on..they left the car right on empty...i made it to the closest gas station when i again herd that humming sound from the fuel pump.from that day on it has made the humming sound..shortly after it began stuttering during accelration..this would go away for two or three months then start up again..so back to my original question.is it normal to hear a slight humming from the fuel pump??? or is this new pump on the way out again ??? thanks everyone