Service Manual

Fuel Filter (Spin-On Type) ISB, ISBe and QSB (Common Rail [...]
Page 6-32 Section 6 - Injectors and Fuel Lines - Group 06
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If the fuel pressure is below the minimum at the inlet side
of the filter:
1 Check for a high fuel inlet restriction. Refer to
Procedure 006-020 in Section 6.
2 For engines with an electric lift pump, check for a
malfunctioning electric lift pump. Refer to Procedure
005-045 in Section 5.
3 Check for air in fuel. Refer to Procedure 006-003 in
Section 6.
4 For engines without an electric lift pump, check for a
damaged gear pump. Refer to Procedure 005-016 in
Section 5.
Reconnect the fuel lines.
Record the fuel filter inlet pressure measured.
Disconnect the high pressure pump inlet from the fuel
filter exit.
Insert the fuel pressure gauge adapter, Part Number
3164044, between the high pressure pump inlet line and
the fuel filter outlet.