Service Manual

ISB, ISBe and QSB (Common Rail [...] Fuel Inlet Restriction
Section 6 - Injectors and Fuel Lines - Group 06 Page 6-53
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Remove the banjo bolt from the inlet to the gear pump.
Measurement of the fuel inlet restriction requires the use
of a pressure gauge adapter kit, Part Number 4918324.
Install the M12 male x M12 female adapter, contained in
the pressure gauge adapter kit, through the banjo fitting
on the inlet to the gear pump.
Install the original banjo bolt contained in the pressure
gauge adapter kit, through the banjo fitting on the
pressure gauge hose, and into the M12 male x M12
female adapter.
Install a vacuum gauge that has a range of at least 0 to
508.0 mm-Hg [0 to 20 in-Hg] onto the pressure gauge
adapter.
Disconnect the fuel supply line from the inlet to the gear
pump.
Install a pressure gauge adapter, Part Number 4918462,
between the fuel supply line and the inlet to the gear
pump.
Install a vacuum gauge that has a range of at least 0 to
508.0 mm-Hg [0 to 20 in-Hg] onto the pressure gauge
adapter.