........ I cannot hear the fuel pump when I turn on the key.
Could you hear the pump run before the start-up problem? Remember, it only runs 2 seconds after "key on", then shuts off unless engine is cranking. So you have to "catch" the sound of it during those 2 seconds.... If I spray starting fluid into the throttle body the trucks starts right up but dies as soon as it uses up the starting fluid.
So it has spark, tries to run, stops for lack of fuel. When this happens, is the engine reasonably smooth-running, no big shake or vibration?What do you all think it is??????
.......If pump definitely does not run, I would check for voltage present at the fuel tank pump connector, looking "back" into the harness. If no voltage present when there should be, during those 2 seconds again, the pump is most likely OK.......fuses, pump relay (how did you check it?), bad connection somewhere between pump relay and tank, maybe at inertia switch connector, or contacts within inertia switch itself. Wiring diagrams help a lot; the "hot" conductor bringing juice to the pump is often PINK-colored wire, if voltage present at tank, pump no good..... let us know if my mumbo-jumbo produces any results for you!