Have an 01,1/2, put in larger fuel tank so thought I should change the fuel filter. Heard,here, all the stuff you should do, drain this and that, but all I did was take the top off the assembly,carefully lift out the old filter and slowly put in the new filter. Truck started right up, as usual, and idled,like usual. Easy as pie, took about two minutes. No muss, no fuss. Only have about 7k on the truck, so the inside of the housing looked clean.