4 ENGIN E SY M PTOMS DIAGNOSTICS 133
CAUTION: Be sure to place a rag or suitable con ta iner
under the fuel pressure test valve when bleeding the
fuel rail. Dispose of fuel in a correct container clearly
marked DIESEL FUEL according to local regulations.
NOTE: Engine fuel can be a threat to the environment.
Never dispose of engine fuel by putting it in the trash,
pouring on the ground, in the sewers, in streams, or
bodies of water.
Figure 160 Shrader valve assembly
1. Valve
2. Center stem
Figure 161 Diagnostic coupling
1. Valve
2. Center section
NOTE: Engines are equipped with a fuel pressure
test valve in the form of either a Shrader valve or a
diagnostic coupling.
6. Place either a shop rag or suitable container under
the fuel pressure test valve.
NOTE: It is recommended to use the Fuel Pressure
Test Adapter to avoid bending the needle in the
Shrader valve. The Fuel Pressure Test Adapter is
part of Fuel Pressure Test Kit ZTSE4657.
7. Depress the fuel pressure test valve center
section.
• If air is released, and you can now pump the
primer hand pump, go to “Aerated Fuel” (page
104) in this section.
• If unable to work the pump after releasing
pressure from the fuel test valve, repair the
fuel pump primer.
Figure 162 Fuel Pressu
re Gauge
1. Quick disconnect che
ck valve
2. Fuel test line
3. Fuel Pressure Gauge
4. Inline shut-off valve
5. Clear test line
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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