1995 Buick Riviera with no acceleration….

My Riviera died about a week ago…had no acceleration, and then just quit…was told it was bad fuel pump, so we had it replaced.  We drove for about 3 days, and symptoms were happening again.  It bogs, then won’t go.  It will start right up, then die or run with barely any acceleration.  (It sort of like when you run out of gas). We found out after a week, that guy who did fuel pump never changed the fuel filter.  So, we did this.  Now it’s doing the same thing again

Any suggestions?  Could it be that we drove on old filter for a week that the new pump is now bad?  HELP!!