Service Manual

ISB, ISBe and QSB (Common Rail [...] Fuel Pressure Relief Valve
Section 6 - Injectors and Fuel Lines - Group 06 Page 6-99
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3.9L and 5.9L Engines
Disconnect the fuel pressure relief valve line.
4.5L and 6.7L Engines
If applicable, remove the cap screw holding the
combination temperature and pressure sensor in place.
Refer to Procedure Procedure 100-002 (Engine Views) for
sensor location.
If applicable, remove the air intake combination
temperature and pressure sensor.
If applicable, place tape over the sensor port to prevent
debris from entering the air intake.
Remove
3.9L and 5.9L Engines
NOTE: The pressure relief valve is located between the
fuel rail and the fuel pressure relief valve drain line.
CAUTION
Once the fuel pressure relief valve has been removed,
it must be replaced. Reuse of pressure relief valve will
cause a fuel leak.
Remove the fuel rail pressure relief valve.
4.5L and 6.7L Engines
NOTE: The fuel pressure relief valve is a cartridge located
at the front end of the fuel rail.
Remove the fuel pressure relief valve.