Table 83
Troubleshooting Test Steps
Values Results
8. Fuel Supply
A. Check for leaks from the high-pressure fuel lines.
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 solidi-
fied fuel (wax).
E. Check the primary filter/water separator for water in the
fuel.
F. Check for fuel supply lines that are restricted.
G. Replace the in-line fuel filter that is installed upstream of
the Electric Fuel Lift Pump (EFLP).
H. Replace the primary and secondary fuel filters.
I. Check the diesel fuel for contamination. Refer to Systems
Operation, Testing, and Adjusting, “Fuel Quality - Test”.
J. Check for air in the fuel system. Refer to Systems Opera-
tion, Testing, and Adjusting, “Air in Fuel - Test”.
Fuel system Result: There is a leak from a high-pressure fuel line.
Repair: Replace the high-pressure fuel line. Refer to Disas-
sembly and Assembly, “Fuel injection lines - Remove” and
Disassembly and Assembly, “Fuel injection lines - Install”.
Result: The vent in the fuel cap is blocked.
Repair: Install a replacement fuel cap.
Result: The fuel contains solidified wax.
Repair: Replace the fuel with fuel of the correct specification
for the ambient conditions.
Result: There are fuel supply lines that are restricted.
Repair: Replace any damaged or restricted fuel lines.
Replace the primary fuel filter and the secondary fuel filters.
Refer to the Operation and Maintenance Manual for further
information.
Result: There is air in the fuel system.
Repair: Prime the fuel system. Refer to Systems Operation,
Testing, and Adjusting, “Fuel System - Prime”.
Result: The diesel fuel is contaminated.
Repair: Drain the fuel tank and the fuel system.
Replace the primary fuel filter and the secondary fuel filters.
Refer to the Operation and Maintenance Manual for further
information.
Fill and prime the fuel system with fuel of the correct specifica-
tion. Refer to Systems Operation, Testing, and Adjusting,
“Fuel System - Prime”.
Result: The fuel supply is OK.
Proceed to Test Step 9.
UENR4469-36 165
Symptom Troubleshooting
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