E 350 V8-5.4L (2008)
Fuel Pressure: Testing and Inspection
FUEL SYSTEM PRESSURE TEST
Special Tool(s)
Special Tool(s)
WARNING:
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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.
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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.
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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.
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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. Disconnect the fuel supply tube-to-fuel rail spring lock coupling.
2. NOTE: 4.6L shown, 5.4L and 6.8L similar.
Install the special tool in line between the fuel supply tube and fuel rail.
3. NOTE: The fuel pump fuse was removed during the fuel system pressure release.
Install the fuel pump fuse.
4. 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.
5. Test the fuel system pressure to make sure it is within the specified range.
6. NOTE:
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4.6L shown, 5.4L and 6.8L similar.
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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 special tool and relieve the fuel system pressure.
