To be certain, you should:
* Consult your owner's manual: This is the best resource for the exact location and instructions for replacing the filter.
* Use a repair manual specific to your vehicle: These manuals often have detailed diagrams.
* Check online forums: Search for "1991 Buick Century fuel filter location" on forums dedicated to Buick or car repair. You may find photos from other owners.
Caution: Fuel is flammable and potentially dangerous. If you are unsure about how to locate or replace the fuel filter, it's best to take your vehicle to a qualified mechanic.