It should be changed every 30k. I do mine every 15 to 20k. It is better on the fuel pump I think plus not as hard to change as a fuel pump.
NW Posse#10 Team Duratec#69
F2 Header, Steath Exhaust, CAI, AR103, Tuned by Randy Fswerks, DGR Coil Overs
DOMINANT front and rear LCA DOMINANT endlinks Massive toe and camber arms