Service Manual

Fuel Filter (Spin-On Type) ISB, ISBe and QSB (Common Rail [...]
Page 6-30 Section 6 - Injectors and Fuel Lines - Group 06
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Without Fuel Filter Diagnostic Ports
Use the following steps to check the fuel filter restriction to
measure the pressure drop across the fuel filter.
Disconnect the gear pump supply line from the fuel filter
inlet.
Insert the fuel pressure gauge adapter, Part Number
3164044, between the gear pump supply line and the fuel
filter head inlet.
Attach a pressure gauge to the Compuchek™ fitting on
the fuel pressure gauge adapter.
Initial Check
With Electric Lift Pump(s)
Measure the fuel pressure at the fuel filter inlet.
NOTE: For marine applications, open the fuel inlet and
return valves.
Measure the pressure at high idle:
Fuel Pressure Range At Fuel Filter Inlet with Electric
Lift Pump (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 with Electric
Lift Pump (Engine Cranking)
kPa psi
0 MIN 0
79.9 MAX 11.6
Record the fuel filter inlet pressure.