The fuel pump driver module on a 2004 Lincoln Navigator is typically located
in the passenger compartment, under the dashboard. However, the exact location can vary slightly depending on trim level and specific vehicle configuration. It's often near the fuse box or other electronic control modules.
You'll likely need to consult a repair manual specific to your 2004 Lincoln Navigator to pinpoint its precise location. A wiring diagram would also be helpful in tracing the fuel pump circuit. Trying to find it without a proper diagram risks damaging other components.