(Table 80, contd)
Troubleshooting Test Steps
Values Results
4. Fuel Supply
A. Ensure that the vent in the fuel cap is not filled with debris.
B. Ensure that the fuel supply valve (if equipped) is in the full OPEN
position.
C. If the temperature is below 0 °C (32 °F), check for solidified fuel
(wax).
D. Check the primary filter/water separator for water in the fuel.
E. Check for fuel supply lines that are restricted.
F. Replace the in-line fuel filter that is installed upstream of the Elec-
tric Fuel Lift Pump (EFLP).
G. Check that the EFLP is operating correctly.
H. Replace the primary and secondary fuel filters.
I. Check the diesel fuel for contamination. Refer to Systems Opera-
tion, Testing, and Adjusting, “Fuel Quality - Test”.
J. Check for air in the fuel system. Refer to Systems Operation,
Testing, and Adjusting, “Air in Fuel - Test”.
Fuel system 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 specifi-
cation for the ambient conditions.
Result: There are fuel supply lines that are restricted.
Repair: Replace any damaged or restricted fuel lines.
The EFLP is suspect. Refer to Troubleshooting, “Fuel
Transfer Pump - Test”.
Replace the primary fuel filter and the secondary fuel fil-
ters. 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 Opera-
tion, 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 fil-
ters. Refer to the Operation and Maintenance Manual for
further information.
Fill and prime the fuel system with fuel of the correct
specification. Refer to Systems Operation, Testing, and
Adjusting, “Fuel System - Prime”.
Result: The fuel supply is OK.
Proceed to Test Step 5.
5. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation, Test-
ing, and Adjusting, “Compression - Test ”.
Cylinder
compression Result: The results of the compression test are outside
the specifications.
Investigate the cause and rectify any faults.
Note: Possible causes of low compression are shown in
the following list:
· Loose glow plugs
· Faulty piston
· Faulty piston rings
· Worn cylinder bores
· Worn valves
· Faulty cylinder head gasket
· Damaged cylinder head
(continued)
UENR4469-36 161
Symptom Troubleshooting
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