Service Manual

Fuel Filter (Spin-On Type) ISB, ISBe and QSB (Common Rail [...]
Page 6-34 Section 6 - Injectors and Fuel Lines - Group 06
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Marine Applications
NOTE: For marine application engines, the lift pump outlet
pressure to the filter is measured at the diagnostic port on
the inlet side of the fuel filter head. Refer to Procedure
005-045 in Section 5.
To check the fuel filter restriction, measure the pressure
drop across the fuel filter using the following steps.
Install an M10 male Compuchek™ fitting, Part Number
3824842, on the diagnostic port on the inlet side of the
fuel filter.
Connect a fuel pressure gauge to the Compuchek™
fitting.
Measure the pressure at high idle:
Fuel Pressure Range At Fuel Filter Inlet (Engine
Running)
kPa psi
0 MIN 0
79.9 MAX 11.6
If the engine will not start, measure the fuel pressure
while cranking the engine:
Fuel Pressure Range At Fuel Filter Inlet (Engine
Cranking)
kPa psi
0 MIN 0
79.9 MAX 11.6
Record the fuel filter inlet pressure measured.
If the fuel pressure is below the minimum at the inlet side
of the filter, the electric lift pump can be damaged or inlet
restriction can be too high. Refer to Procedure 005-045 in
Section 5. Refer to Procedure 006-020 in Section 6.