Grand Marquis V8-4.6L Flex Fuel (2010)
Fuel Pressure Release: Service and Repair
Fuel System Pressure Release
WARNING: Do not smoke, carry lighted tobacco or have an open flame of any type when working on or near any fuel-related component.
Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in serious personal injury.
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 component. Highly flammable mixtures are always present and may be ignited. Failure to follow these instructions may result in
serious personal injury.
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.
1. NOTE: The Fuel Pump (FP) module fuse is located in the Battery Junction Box (BJB), location F4.
Remove the FP module fuse.
2. Start the engine and allow it to idle until it stalls.
3. After the engine stalls, crank the engine for approximately 5 seconds to make sure the fuel system pressure has been released.
4. Turn the ignition switch to the OFF position.
5. When fuel system service is complete, install the FP module fuse.
6. 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.
7. NOTE: Carry out a Key ON Engine OFF (KOEO) visual inspection for fuel leaks prior to starting the engine.
Start the vehicle and check the fuel system for leaks.
