99 300M fuel filter

Is the fuel filter on a 99 300M part of the fuel filter, or is there a separate one? We tested the fuel pump and it was putting out 50, so we thought maybe it was a dirty filter. The car didn't want to start once. Now it's working great. We don't want to replace the pump if it's not necessary.

Filter assembly is in the gas tank, I believe.

Thats correct, the fuel filter is at the fuel pump inside the tank.