1996 GMC Yukon on start

Did you checked the fuel pressure after you replaced the fuel pump if not do so with fuel pressure gauge designed for your fuel system. If its within specs -Look for ignition spark-

Disconnect a sparkplug wire or 2 and ground it to the engine atleast 3/16 in away from ground have helper crank engine over-do you have a snapping blue spark?

No snapping blue spark continue to troubleshoot the ignition system-power input to the coil/coil packs, coil's resistances, cap and rotor /distributor pick-up coil, ignition control module, ECM, Ignitor camshaft and crankshaft sensors-