It sounds like the fuel pump was dead or dying before the repeated attempts to start the truck. This would explain why it did not start and why you can't hear the pump priming anymore. Before you run out and spend all that money on a new pump, check your fuel pressure with the key in the run position. It should read at least 60 psi and the pressure should hold there and not drop off for a few minutes. Not all Chevy fuel pumps are loud while priming or when their running. Even though I agree that the problem is most likely the pump, there is a possibility that we are all wrong and its something like no spark or a faulty sensor which would both prevent the engine from starting. Hit the bottom of the fuel tank with your fist or a rubber mallet a couple times and see if it starts. If is does replace the pump asap. If you do have to replace the pump make sure you get an AC Delco, Delphi, or Walbro, because the rest are junk ans won't last very long.
2005 ZR2 Blazer / Mods- Spectre CAI, Descreened MAF, Shaved Throttle Blade, 31" Goodyear Kevlar MT/R's, Black Rock Rims, MSD Street Fire CDI & Super Conductor Wires, Accel Cap, Rotor & Coil, Flowmaster 30 Series, Gibson Tailpipe, ES Bushings, Goodridge Brake Lines, Power Slot Rotors - 1996 Impala SS / Mods- Too Many To List - 1988 S10 Blazer / Mods- Too Many To List - 2001 S10 Crew Cab 4x4 / Mods- Too Many To List *Wrecked 12/06*