* On the frame rail: This is the most common location. Look along the frame rail, usually near the fuel tank, but possibly closer to the engine. It's often a cylindrical canister.
* In the fuel tank: Less common, but possible on some 1994 F-150s. If it's in the tank, you'll need to drop the tank to replace it.
To find it definitively:
1. Consult your owner's manual: This is the best resource. It should have a diagram showing the location.
2. Use a repair manual: A Haynes or Chilton manual for your specific year and engine will have detailed diagrams and instructions.
3. Search online: Search for "1994 Ford F150 fuel filter location [your engine size]" (e.g., "1994 Ford F150 fuel filter location 5.0L"). You might find photos or videos showing its location on a similar truck.
Before attempting any work on the fuel system, remember that gasoline is highly flammable. Take appropriate safety precautions.