To be certain, I strongly recommend:
* Consulting your owner's manual: This is the best source for the exact location.
* Checking a repair manual specific to your year and model: Chilton or Haynes manuals will have diagrams and detailed instructions.
* Searching online for a diagram: Use a search term like "1984 Chevrolet Suburban fuel filter location [engine type, 2WD/4WD]" Many forums and websites with repair guides contain pictures.
Remember to be careful when working near fuel lines. Fuel is flammable, and you should take appropriate safety precautions.