My 97 chevy 1/2 ton sub. is giving me fits. The history goes is this, in Jan. the fuel pump stoppped working. Elec. checked out OK, so I changed the pump. ( I was lazy and didn't change the inline filter) Truck started and drove 5 -10 miles before it started dying at stop lights, then it quit starting all together. The pressure was weak at this point(28-40lbs while cranking) so I changed the inline filter. This did nothing for my pressure issue so I changed out the pump again. Now the truck will give 60 - 68lbs. right off the bat, but after running for about 2 min. it starts to surge then die. After dying the pressure is only 40lbs. while priming or cranking. I have now changed the pressure regulator and the problem is still the same. It seems to leak down some pressure while sitting and if given an hour or two it will pressure up and start but only for a short while. I have checked for external leaks and connections in the tank. Now where do I go from here???