1. Identify your engine: Check your vehicle's documentation (owner's manual, etc.) or look for an engine identification plate (usually on the engine block). Knowing the engine (e.g., 350 small-block, 454 big-block, etc.) is crucial.
2. Consult a repair manual: Once you know the engine, get a repair manual specific to your 1988 Silverado and that engine. These manuals have diagrams showing the fuel filter's location. You can find these online (e.g., Haynes, Chilton) or at auto parts stores.
3. Look near the fuel tank: Generally, fuel filters on older vehicles are located somewhere along the fuel line between the fuel tank and the engine. Check under the vehicle, near the frame rails, and possibly in the vicinity of the fuel tank.
Without knowing the engine, I cannot give you a precise location. Searching for diagrams online using your specific engine will also be helpful.
