(Table 12, contd)
Troubleshooting Test Steps Values Results
F. Ensure that the wastegate on the high-pressure turbocharg-
er is adjusted correctly. Refer to Systems Operation, Testing,
and Adjusting, “Turbocharger - Inspect”. If the wastegate ac-
tuator is faulty, replace the high-pressure turbocharger. Refer
to Disassembly and Assembly, “Turbocharger - Remove” and
Disassembly and Assembly, “Turbocharger - Install”.
7. Fuel Supply
A. Visually check the fuel level in the fuel tank. Do not rely on
the fuel gauge only.
B. Ensure that the vent in the fuel cap is not filled with debris.
C. Ensure that the fuel supply valve (if equipped) is in the full
OPEN position.
D. If the temperature is below 0 °C (32 °F), check for solidified
fuel (wax).
E. Check the primary filter/water separator for water in the fuel.
F. Check for fuel supply lines that are restricted.
G. Check that the low-pressure fuel lines are tight and secured
properly.
H. Check that the Electric Fuel Lift Pump (EFLP) is operating.
If the EFLP is suspect, refer to Troubleshooting, “Fuel Transfer
Pump - Test”.
I. Replace the in-line fuel filter that is upstream of the primary
fuel filter.
J. Replace the primary and secondary fuel filters.
K. Check the diesel fuel for contamination. Refer to Systems
Operation, Testing, and Adjusting, “Fuel Quality - Test”.
L. Check for air in the fuel system. Refer to Systems Operation,
Testing, and Adjusting, “Air in Fuel - Test”.
M. Ensure that the fuel system has been primed. Refer to Sys-
tems Operation, Testing, and Adjusting, “Fuel System - Prime”.
Fuel system Result: The fuel supply is not OK.
Repair: Repair the fuel system or replace the fuel system
components, as necessary.
Result: The fuel supply is OK.
Proceed to Test Step 8.
68 UENR4469-36
Symptom Troubleshooting
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