6 PERFORMANCE DIAGNOSTICS 259
2. Does the engine have an optional Engine Fuel
Pressure (EFP) sensor?
• If yes, the EST can record fuel pressure
during the road test. Continue to step 5.
• If no, the fuel pressure must be measured with
a m echanical gauge. Continue to step 3.
CAUTION: Be sure to place a rag or suitable conta 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 339 Shrader valve assembly
1. Valve
2. Center stem
Figure 340 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.
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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