FUEL SYSTEM 351
NOTE: Early fuel filter assemblies may have an
M12 port fitting (item 2) in the location of M10 plug
assembly (item 9). Item 2 is used by the assembly
plants as a fuel fi ll.
• If item 2 is installed on housing cover assembly, it
canbeusedtomeasureunfiltered fuel pressure.
• If item 2 is installed in item 9 location, it can be
used to measure fuel inlet restriction.
It is not recommended to disassemble the fuel filter
beyond circumstances involving periodic servicing
that include the following:
•Fuelfilter element replacement
• Fuel strainer
• Sensor replacements (if determined by a DTC)
The fuel filter assembly can and should be
disassembled if any of the following issues have
been observed:
• Contaminated fuel has been introduced to the
engine, resulting in poor performance.
• Fuel or air leaks involving the priming pump
assembly.
NOTE: If the fuel filter header assembly is
disassembled, use clean diesel fuel to lubricate
the following parts and during reassembly.
• Threads of fuel bowl.
•O-ringgasket.
• Threads and O-ring on Water In Fuel (WIF)
sensor.
• Threads and O-ring on drain valve.
Tighten items to the special torque (Table 47).
EGES-265-2
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© 2009 Navistar, Inc.
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