4 ENGIN E SY M PTOMS DIAGNOSTICS 105
NOTE: Engines are equipped with a fuel pressure
test valve in the form of either a Shrader valve o r a
diagnostic coupling.
1. Check fuel pressure and aeration from fuel
pressure test valve located at the front of the
intake manifold.
2. Check fuel pressure and aeration from fuel
pressure test valve located at the front of the
intake manifold.
Figure 114 Fuel Pressure Gauge
1. Quick disconnect check valve
2. Fu el test line
3. Fu el Pressure Ga uge
4. Inlin e shut-off valve
5. C lear test line
Figure 115 Fuel Pressure Test Adapter
NOTE: If the engine is equipped with a Shrader valve,
use the Fuel Pressure Test Adapter.
Figure 116 Fuel/Oil Pressure Test Coupler
NOTE: If the engine is equipped with a diagnostic
coupling, adapt the Fuel/Oil Pressure Test Coupler to
the Fuel Pressure Gauge.
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
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