The fuel filter on a 1986 Ford Aerostar XLT is located
on the frame rail, near the fuel tank. It's usually towards the rear of the vehicle, but its exact position can vary slightly depending on the engine (2.3L or 2.8L V6). You'll likely need to get under the vehicle to see it.
Because it's often tucked away, it's best to consult a repair manual specific to your 1986 Ford Aerostar XLT with the engine size for the most accurate location. A visual diagram in the manual would be invaluable.
