Mountaineer AWD V8-4.6L (2010)
Fuel Pressure: Testing and Inspection
Fuel System Pressure Test
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: 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.
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: When handling fuel, always observe fuel handling precautions and be prepared in the event of fuel spillage. Spilled fuel may be
ignited by hot vehicle components or other ignition sources. Failure to follow these instructions may result in serious personal injury.
1. Release the fuel system pressure. For additional information, refer to Fuel System Pressure Release See: Fuel Filter/Fuel Pressure Release/Service
and Repair.
2. Disconnect the battery ground cable. For additional information, refer to Battery.
3. Disconnect the fuel supply tube-to-fuel rail spring lock coupling. For additional information, refer to Spring Lock Couplings See: Fuel Line
Coupler/Service and Repair/Spring Lock Couplings.
4. NOTE: 4.6L shown, 4.0L similar.
Install the Fuel Pressure Test Kit in line between the fuel supply tube and fuel rail.
5. NOTE: The Inertia Fuel Shutoff (IFS) switch electrical connector was disconnected during fuel system pressure release.
Connect the IFS switch electrical connector.
6. Connect the battery ground cable. For additional information, refer to Battery.
7. 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.
8. Test the fuel system pressure to make sure it is within the specified range. For additional information, refer to Specifications.
9. NOTE: 4.6L shown, 4.0L similar.
NOTE: Open the drain valve slowly to relieve the fuel system pressure. This may drain fuel from the system. Place the fuel in a suitable container.
Upon completion of the fuel system pressure test, open the drain valve on the Fuel Pressure Test Kit and relieve the fuel system pressure.
