Glowsock

Hello everyone I have an 89 firebird 305 Tbi, the other day my car was stalling out and having trouble starting back up, it was very hot out, I cracked open my gas cap and that seemed to help with the problem, but apparently not. A couple stalls later, the car refused to start, I noticed that when this happens the fuel gauge reads over full, why is this? When I turn the key now, the fuel pump does not buzz as it normally does, do I need to buy a new fuel pump? How can I test it