car not starting (may be fuel related)

Hi, i drive a Hyundai accent 2002 model.
For the past year, on three different occasions, my car has had trouble starting. It has always been fuel related, the first time my car wasn’t able to pump fuel into the filter, the second time it was pumping fuel into the filter but wouldn’t exchange through the filter to start, and the third time it started after about 45 minutes. All of these times i have had all less than half a tank of fuel in my car, also my fuel gauge never tells me i have a full tank of guess. I was wondering whether it is the fuel pump that needs replacing, or whether there is another problem with the car altogether, any advice would be good thanks 🙂