A friend had that issue. There were not happy when a good mechanic replaced a gas filter and it was cured.
My 1997 Chevrolet Blazer, Model S 10506, Vortec 4.3 Liter has given me problem with the fuel pump. I have replaced it a couple of times already. It might be a problem with the voltage reaching the pump. What is the correct voltage? How do I correct that? Would a wire directly from the batery to the pump help?
Thanks for any help coming this way.