Service Manual

ISB, ISBe and QSB (Common Rail [...] Fuel Filter (Spin-On Type)
Section 6 - Injectors and Fuel Lines - Group 06 Page 6-35
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Install an M10 Compuchek™ fitting, Part Number
3824842, on the diagnostic port on the outlet side of the
fuel filter.
Connect a fuel pressure gauge to the quick-disconnect
fitting.
Measure the pressure at low idle:
Fuel Pressure Range At Fuel Filter Inlet (Engine
Running)
kPa psi
0 MIN 0
79.9 MAX 11.6
Record the fuel filter outlet pressure value and subtract it
from the previously measured fuel filter inlet pressure.
Fuel Pressure Drop Across Fuel Filter
kPa psi
34 MAX 5
If the pressure drop is greater than the specified value,
the fuel filter must be replaced.
Remove
NOTE: For marine applications, shut off fuel supply to
engine.
WARNING
Fuel is flammable. Keep all cigarettes, flames, pilot
lights, arcing equipment, and switches out of the
work area and areas sharing ventilation to reduce the
possibility of severe personal injury or death when
working on the fuel system.
CAUTION
Use caution when disconnecting or removing fuel
lines, replacing filters and priming the fuel system, so
that fuel is not spilled or drained into the bilge area.
Do not drop or throw filter elements into the bilge
area. The fuel and fuel filters must be discarded in
accordance with local environmental regulations.
Loosen and remove the fuel filter.
Make sure the seal ring does not stick to the fuel filter
head.
Remove the ring with an o-ring pick, if necessary.