Service Manual

ISB, ISBe and QSB (Common Rail [...] Fuel Pressure Relief Valve
Section 6 - Injectors and Fuel Lines - Group 06 Page 6-95
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Fuel Pressure Relief Valve (006-061)
General Information
WARNING
The fuel pump, high-pressure fuel lines, and fuel rail
contain very high-pressure fuel. Do not loosen any
fittings while the engine is running. Wait at least 10
minutes after shutting down the engine before
loosening any fittings in the high-pressure fuel
system to allow pressure to decrease to a lower level.
WARNING
The pressure within the fuel rail is extremely high.
High pressure can penetrate the skin. Stand clear of
the engine while it is running.
WARNING
The fuel pump high-pressure fuel lines and fuel rail
contain very high pressure fuel. To avoid the
possibility of personal injury, never loosen any
fittings while the engine is running.
WARNING
Fuel can be returned at highly elevated temperatures.
Wear safety glasses, protective gloves, and clothing
when performing this test. Avoid any contact with
returned fuel.
CAUTION
Make sure that the fuel inlet and return valves are
returned to the open position before cranking engine.
Engine damage can result if valves are in the wrong
position when engine is cranked or started.
Environmental damage can also occur. Refer to
Procedure Procedure 005-999 (Fuel System Overview)
in Familiarization section for further information.
Directions for service of a white tang quick-disconnect
fitting:
Push in white tang to release fuel line.
Pull to lock fuel line.