To be certain, you should:
* Consult your owner's manual: This is the most reliable source for the specific location on your vehicle.
* Look under the truck: Carefully inspect the area near the fuel tank and frame rails. The canister is usually cylindrical and made of plastic or metal.
* Use a repair manual: A Chilton's or Haynes repair manual for your specific year and model S-10 will have diagrams showing the location.
Searching online for "[Your S-10 year] S-10 evaporative canister location" might also yield images from other owners. But always double-check against your own truck.