Service Manual

ISB, ISBe and QSB (Common Rail [...] Fuel Lift Pump
Section 5 - Fuel System - Group 05 Page 5-31
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Measure
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.
WARNING
Do not vent the fuel system on a hot engine; this can
cause fuel to spill onto a hot exhaust manifold, which
can cause a fire.
CAUTION
Use caution when disconnecting or removing fuel
lines, replacing filters and priming the fuel system
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.
Install an M10 male Compuchek™ fitting, Part Number
3824842, on the diagnostic port on the inlet side of the
fuel filter.
NOTE: Fuel filter may be remote mounted off-engine.
Connect the service tool containing a 1.09-mm [0.043-in]
orifice, Part Number 3164621, to the diagnostic port.
Allow the other end of the hose to drain into a 500-ml
graduated beaker, Part Number 3823705.
NOTE: This test is performed with the engine not running.
Start the lift pump by using the INSITE™ electronic
service tool lift pump override test. Use the following
procedure for INSITE™ electronic service tool test
instructions. Refer to Procedure 014-008 in Section 14.
Alternatively, the lift pump can be temporarily activated by
turning the keyswitch ON or by “bumping” the starter
without starting the engine.
Measure the amount of fuel flowed by the lift pump in a
30-second interval:
• Fuel flow rate for lift pump (engine not running) -
greater than 300 ml in 30 seconds.
NOTE: The lift pump may run longer than 30 seconds at
key ON. A separate bucket is recommended to catch
excess fuel pumped after the 30 second test interval.