To find it, you'll need to consult a repair manual specific to your Expedition's year, make, and engine. The manual will have diagrams showing the exact location. You can typically find these manuals online (some are free, others are paid) or at auto parts stores.
Generally, it's located somewhere within the fuel system's lines, often near the fuel rail or on the fuel pump itself. However, without knowing your specific Expedition's details, giving a precise location is impossible and could lead to incorrect information.
