Fuel System Pressure Release - 4.6L, 5.4L and 6.8L

WARNING: This page is about a different car, the 2008 Ford RV Cutaway, 2008 Ford Econoline, 2008 Ford E450 Super Duty, and 2008 Ford Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

WARNING: Before working on or disconnecting any of the fuel tubes or fuel system components, relieve the fuel system pressure to prevent accidental spraying of fuel. Fuel in the fuel system remains under high pressure, even when the engine is not running. Failure to follow this instruction may result in serious personal injury.

Remove the fuel pump fuse from the engine compartment fuse box.
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 relieved.
Turn the ignition switch to the OFF position.
When fuel system service is complete, install the fuel pump fuse.

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.