To be absolutely certain, you should:
* Consult your owner's manual: This is the best resource for the precise location.
* Check a repair manual: A Haynes or Chilton manual specific to your year and model will have diagrams showing the fuel filter location.
* Look online: Search for "1994 GMC 2500 Suburban fuel filter location" along with your engine size (e.g., "1994 GMC 2500 Suburban 5.7L fuel filter location"). You might find pictures or videos from other owners who have already performed this task.
Important Safety Note: Fuel is flammable. When working near the fuel system, take precautions to avoid sparks or open flames. Consider wearing safety glasses and gloves.