The fuel filter on a 1991 Chevy S-10 is typically located
on the frame rail, near the fuel tank, on the passenger side of the vehicle. However, the exact location can vary slightly depending on engine type and specific options. It's usually a cylindrical canister-type filter.
To be absolutely certain, you should consult a repair manual specific to your 1991 Chevy S-10's year, model, and engine. A Chilton's or Haynes manual will provide diagrams and detailed locations. You can also search online for a diagram specific to your truck's VIN.
