180 5 HARD START AND NO START DIAGNOSTICS
13. Fuel Pressure a nd Aerated Fuel
Figure 210
Purpose
To check for correct fuel p ressure and aerated fuel
NOTE: Do the following:
• Ask the operator if the amber WATER IN FUEL
lamp was on during vehicle operation.
• If engine has an optional Engine Fuel Pressure
(EFP) sensor, ask the operator if the amber FUEL
FILTER lamp was on du r ing vehicle operation . If
the lamp was on, change the fuel filter and retest
for poor engine operation.
• If unit was run o ut of fuel, make sure the fuel
system was primed. See “Priming the Fuel
System” in S ection 4 (page 132) for procedure.
• See “Combustion Leaks to Fuel” in Section 4
(page 104) if all three of the following conditions
are noted:
• Fuel system will not prime
• White to black exhaust smoke
• Pulsating fuel pressure
Tools
• Fuel pressure test gauge
• Fuel Pressure Test Kit
• 1to5gallonbucket
• Fuel/Oil Pressure Test Coupler
Fuel Pressure
Procedure
WARNING: To avoid serious personal injury,
possible death or damage to the engine or
vehicle, read all safety instructions in the “Safety
Information” section of this manual.
1. See “DT 466 Performance Specifications” –
Appendix A (page 595) or “DT 570 and HT 570
Performance Specifications” – Appendix B (page
619) for fuel pressure specifications and record
on Diagnostic Fo rm.
NOTE: If engine is equipped with optional Engine
Fuel Pressure (EFP) sensor, use EST with
MasterDiagnostics® software to monitor fuel
pressure. Compare the EST values to gauge
readings .
CAUTION: Be sure to place a rag or suitable container
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 211 Shrader valve assembly
1. Valve
2. Center stem
EGES-270-1
Read all safety instructions in the "Safety Information" section of this manual before doing any proced ures.
Follow all warnings, cautions, and notes.
©August 2008 Navistar, Inc.
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