The engine cranks but will not start and run why can you help me?

Good evening.

This sounds like the ignition module or fuel pump relay has gone out. When you turn the key to the on position without cranking the engine over can you hear the fuel pump run in the tank for 5 seconds?

https://www.2carpros.com/articles/car-cranks-but-wont-start

Please run down this guide and report back.

Roy

As Roy suggested, definitely check the pump's output and the catalytic converter. The aftermarket pumps for these trucks are somewhat bad and often do not put out the pressure that they are supposed to. My aftermarket pump quit working, and the warranty replacement requires priming before I start it sometimes. You can borrow a fuel pressure tester from AutoZone and run the test for it. It should get something like 59 psi with the key turned on, engine off. As for the catalytic converter, the simplest way to check that is to take the upstream O2 sensors out and see how it does. It will be loud as heck though, so do not do it when the neighbors are asleep unless you really do not like them.

Also, when you replaced the fuel pump, did you do the fuel filter as well? If not, it is definitely a good idea.