Original post by: L Pfaff ,
Danny, 3 possible location for fuel filter on 1991 Chevy S10. 2.5/151 4 cylinder fuel filter location under hood/engine compartment by the brakes master cylinder. 2.8/173 6 cylinder fuel filter location under hood/engine compartment driver side, follow fuel line from the throttle body along the front of engine, just below and behind power steering pump is the filter. 4.3/262 6 cylinder fuel filter location under the truck, ahead of fuel tank, attached to the inner side of frame rail. Good luck. I hope this helped you out, if so let me know by pressing the helpful button.