...else keep pumping? I just wanted to know is i use my credit card at the gas station pump and then put the nozzle back and leave can someone else just get the nozzle and pump without me knowing?

no, they cant unless you leave the pump on and don't hang it up

no, but in case you go to a full service station....... never give the attendant your card and go into the store.... they will put your card through another machine and have another attendant bring their car over to get gas.... with your money...... stay in the car.....