Service Manual

ISB, ISBe and QSB (Common Rail [...] Injector
Section 6 - Injectors and Fuel Lines - Group 06 Page 6-73
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For engines with a quick-disconnect fitting on the fuel rail
pressure relief valve, use a female quick-disconnect drain
hose and a block-off fitting to isolate the fuel pressure
relief valve flow.
Remove the quick-disconnect fitting from the pressure
relief valve.
Install a pressure gauge adapter, Part Number 4918462,
on the fuel rail pressure relief valve and drain into a
bucket.
Install a quick-disconnect block-off fitting, Part Number
4918464, into the fuel drain line removed from the fuel rail
pressure relief valve.
Remove the quick-disconnect fitting on the fuel drain line
from the fuel return manifold.
Install a quick-disconnect block-off fitting, Part Number
4918464, into the fuel drain line to prevent fuel flow into
the fuel return manifold.
To prevent high pressure fuel pump drain flow from
entering the injector return flow, remove the fuel drain line
from the high pressure fuel pump.
Install a fuel drain hose with female quick-disconnect, Part
Number 4918434, onto the high pressure fuel pump and
drain into a bucket.
Install a fuel drain hose with a male quick-disconnect
fitting, Part Number 4918433, into the fuel drain line
removed from the injector pump. This hose will be placed
into a graduated cylinder, Part Number 3823705, to
measure injector fuel return flow.