mine 96' lumina 3.1 was stalling at a certain point with the gas gauge at about 1/4 a tank, and i had about 5 people tell me that it was the fuel pump. i had bought a new one and replaced it and it runs good. do you hear like a wining sound when you key is turned on? my fuel pump was weak and you could hear a wining noise with the ignition key turned on.