1999 Chevy Tahoe truck won't start

Engine Mechanical problem
1999 Chevy Tahoe Engine Size unknown Four Wheel Drive Automatic 95000 miles

I have a 99 chevy tahoe, recently the truck would not start it would turn over but would not start, a mechanic stated it was the fuel pump so I changed it, drove it for a couple of days and now it won't start again. Battery is good, I can hear starter, pump is still kicking on took out fuel pump relay for about 5 min and then put it back in tried to restart it however it still won't start could this be that I never changed the filter and it needs to be replaced? Any help with this subject would be great