Fuel problem

I have a 1993 chevy s10 pup, 2WD, 2.8 v6 engine, stick shift. There is about 255,000 miles on the truck. My problem is the truck consumes alot of fuel.I look at the throttle body and see that the top of it looks burnt as well as the gas coming out should be a mist but is short of a stream.I have replaced the o2 sensor, plugs+wires, distributor cap and button.I need to know where the fuel filter is so I can replace it as well any other ideas to correct this problem. Thank You