Fuel Inlet Restriction - Navistar International DT 466 Diagnostic/Troubleshooting Manual

266

Fuel Inlet Restriction

NOTE: This test should only be done if fuel pressure
was low during test drive.
Tools
• Gauge bar (0–30 in Hg vacuum gauge)
• Fuel/Oil Pressure Test Coupler
• Test fitting
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 from test fitting.
NOTE: If an O-ring plug is installed instead of a
test fitting, remove O-ring plug and install Fuel
Test Fitting.
Figure 346 Fuel Test Fitting
Read all safety instructions in the "Safety Information" section of this manual before doing any procedures.
6 PERFORMANCE DIAGNOSTICS
Figure 347 Test line connection to 0–30 in Hg
vacuum gauge
3. Connect test line to the Fuel/Oil Pressure Test
possible death or damage to the engine or vehicle
– comply with the following:
When routing test line, do not crimp the line, run
the line too close to moving parts, or let the line
touch hot engine surfaces. Secure the gauge bar
and test line in the cab so as not to obstruct the
operator.
4. Route test line from cab to engine.
Figure 348 Fuel/oil test coupler with test line
EGES-270-1
Follow all warnings, cautions, and notes.
© August 2008 Navistar, Inc.
1. 0–30 in Hg vacuum gauge
2. Test line connection
Coupler and the 0–30 in Hg vacuum gauge.
WARNING: To avoid serious personal injury,