I need to replace the fuel filter on my 96 Chevy Blazer (4.3 lt). Can anyone tell me where it's located? Thanks in advance.

Here's one for ya! 91 Berretta 3.1L somedays at highway speeds the thing will lose power and the engine light will come on then go out. When you mash the throttle during this loss of power phase the thing blows black smoke out exhaust. Some days it never does it some days it does it several times. My commutes are 40 miles one way at 80 mph--it never does this at around town commutes--always starts and idles great and has plenty of power(as much as a 3.1 will put out--stock) 110,000 miles owned since 30,000 miles and always do regular maint. Fuel mileage went from 28 to 18 mpg! Pulled the codes and got #44 O2 sensor lean condition? O2 was replaced last year--when it would not idle and got code #13. The lean condition does not make sense considering the mpg and black smoke. Thinking about replacing O2 sensor!? Any similar stories or ideas?