Service Manual

Injector ISB, ISBe and QSB (Common Rail [...]
Page 6-72 Section 6 - Injectors and Fuel Lines - Group 06
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Remove the banjo bolt from the injector drain line at the
fuel return manifold.
Insert a fuel drain hose, Part Number 3164618, in place of
the banjo bolt.
Insert the end of the fuel drain hose into a graduated
cylinder, Part Number 3823705, to measure injector return
flow.
Gear Housing Fuel Drain
4.5L Industrial and Automotive Applications
It also applies to 6.7L automotive applications and some
6.7L industrial applications. These engines have a banjo
fitting in the fuel return manifold at the back of the cylinder
head and a combined fuel return manifold
6.7L Engines in Industrial Applications
These engines have a banjo bolt fitting at the back of
cylinder head and one banjo bolt in the fuel return
manifold
If the pressure relief valve fuel return flow measures zero,
proceed with this procedure. If the pressure relief valve
fuel return flow is not zero, use the following procedure
for reseating and replacement instructions. Refer to
Procedure 006-061 in Section 6.
To measure the fuel injector return flow, it is necessary to
isolate the fuel rail pressure relief valve flow.
NOTE: A banjo bolt or a quick-disconnect fitting can be
present on the fuel rail pressure relief valve.
For engines with a banjo fitting on the fuel rail pressure
relief valve, use the fuel rail pressure relief valve flow
tester kit, Part Number 4918295.
Remove the banjo bolt from the fuel rail pressure relief
valve.
Install the fuel rail pressure relief valve fuel drain hose
onto the pressure relief valve using the banjo bolt supplied
in the tester kit.
Install the cap supplied in the pressure relief valve tester
kit onto the existing banjo to cap off the fuel drain line.