266 6 PERFORMANCE DIAGNOSTICS
Fuel Inlet Restriction
NOTE: This test should only be done if fuel pressure
was low during tes t drive.
Tools
• Gauge bar (0–30 in Hg vacuum gauge)
• Fuel/Oil Pressure Test Coupler
•Testfitting
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 restriction specifications and record on
Diagnostic Form.
2. Remove cap fro m test fitting.
NOTE: If an O-ring plug is installed instead of a
test fitting, remove O -ring plug and install F u el
Test Fitting.
Figure 346 Fuel Test Fitting
Figure 347 Test line connection to 0–30 in Hg
vacuum gauge
1. 0–30 in Hg vacuum gauge
2. Test line connection
3. Connect test line to the Fuel/Oil Pressure Test
Coupler and the 0–30 in Hg vacuum gauge.
WARNING: To avoid serious personal injury,
possible death or damage to the engine or vehicle
– comply with the following:
When routing test line, do not crimp the line, run
thelinetooclosetomovingparts,orlettheline
touch hot engine surfaces. Secure the gauge bar
and test line in the cab so as not to obstruct the
operato r.
4. Route t est line from cab to eng ine.
Figure 348 Fuel/oil test coupler with test line
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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