I have a 2000 SR5 Ext cab 4wd with 83k miles. One o2 sensor changed under warranty and changed the front brakes to slotted rotors...other than that trouble free! Planning on the big 90k service and changing the timing belt (dealer says to also change the water pump??) and I see that a fuel filter change is not on the to-do list of the 90k. Where exactly is the fuel filter and should it be changed as pm? Thanks.