Service Manual

Fuel Drain Line Restriction ISB, ISBe and QSB (Common Rail [...]
Page 6-20 Section 6 - Injectors and Fuel Lines - Group 06
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Gear Housing Fuel Return Manifold
Disconnect the quick-disconnect fitting on the fuel drain
line closest to the connection to the OEM fuel drain line.
Insert a pressure gauge adapter, Part Number 4918462,
between the disconnected fuel drain line and the OEM
fuel drain line connection.
Attach a pressure gauge to the fitting on the fuel pressure
gauge adapter.
High Mount Fuel Return Manifold
The fuel return manifold is located beside the fuel rail near
the top of the engine.
NOTE: The fuel filter could be remote mounted off the
engine.
Remove the banjo bolt from the fuel return manifold. (This
is an inline banjo fitting).
Install the M12 x 1/8” NPT banjo screw, Part Number
4918413, in place of the banjo bolt.
Insert a pressure gauge into the back of the banjo screw.
NOTE: If two banjo fittings are present on the fuel return
manifold, the M12 x 1/8” NPT banjo screw can be used in
either location.