The fuel filter does not stop 100% of the dirt and other debris. The longer you run a filter, more of the containments will be pumped through the injection system. That can cause damage injector and CP3 damage, and will be very expensive to repair.
You should change the fuel filter from 6K to 10k miles, and maybe even sooner, if you do not drive a lot. and it sits for extended times.
Chevy 04.5 LLY, 2X, shell, XDR, MikeL Heavy duty up-grade, 6spd, TransGo, deep pan, de-badged, 65 Gallon replacement Aero tank, LBZ-mp, Kennedy pump, shimmed, Pre-fuel filter, tow mirrors, BU cam, gauges, GPS, Sirius, bags, custom grille, fender vents, HD trans cooler- Curt front hitch, footwell lights, load lights, Studs, head gaskets.--- Jerry