Again, per the CD manual:
Fuel System Pressure Release
WARNING: Do not smoke or carry lighted tobacco or open flame of any type when working on or near any fuel-related component. Highly flammable mixtures are always present and may be ignited, resulting in possible personal injury.
WARNING: Fuel in the fuel system remains under high pressure even when the engine is not running. Before servicing or disconnecting any of the fuel lines or fuel system components, the fuel system pressure must be relieved to prevent accidental spraying of fuel, causing personal injury or a fire hazard.
WARNING: Do not carry personal electronic devices such as cell phones, pagers or audio equipment of any type when working on or near any fuel-related components. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions can result in personal injury.
Remove the fuel pump relay. For fuel pump relay location, refer to Wiring Diagrams.
Start the engine and allow it to idle until it stalls.
After the engine stalls, crank the engine for approximately 5 seconds to make sure the fuel injection supply manifold pressure has been released.
Turn the ignition switch to the OFF position.
When fuel system service is complete, install the fuel pump relay.
NOTE: It may take more than one key cycle to pressurize the fuel system.
Cycle the ignition key and wait 3 seconds to pressurize the fuel system. Check for leaks before starting the engine.
Start the vehicle and check the fuel system for leaks.
On the other hand, I have disconnected the Inertia switch on my T-Bird to get the same result.
Disconnect the battery ground cable. For additional information, refer to Section 414-01 .
Remove the Left Hand door sill plate.
Remove the LH lower A-pillar trim panel.
Remove the pin-type retainer and the trim panel.
Disconnect the inertia fuel shutoff (IFS) switch electrical connector
To install, reverse the removal procedure.