1998 Chevy Camaro The Gremlin

Other Category problem
1998 Chevy Camaro V6 Two Wheel Drive Manual 130000 miles

One day driving down the road, the car just quit, with no warning signs. It didnt try to start at all afterward, but did sound normal when it was turning over. I got it towed into a GM dealer and they said fuel pump, so we went going to pick it up (they wanted nearly $2000), and they said they got it running by tapping on the gas tank. So I risked it and drove it all the way home (nearly 140 miles). We then changed the fuel pump, and fuel filter. As I was driving it back, it did the same thing, going a constant 58 mph, it just died like someone shut the key off. Any ideas? Thanks