1998 Chevy Suburban Will not start

Engine Mechanical problem
1998 Chevy Suburban V8 Four Wheel Drive Automatic

My fuel pump went out 2 times replace it. I ran the truck for a hour and no problems. Turn it off I put the fuel tank back in but now it will not start change the fuel filter thinking that it was not getting fuel, but fuel is getting to the motor, I have spark I have fuel what could be the problem. Could it be a crank sensor keeping it from starting because I do have oil leaking on to the crank sensor.