(Table 98, contd)
Troubleshooting Test Steps
Values Results
10. Check the Return Fuel Lines
A. Make sure that the TPIR return line is not blocked or kinked.
B. If the TPIR return line is clear, confirm that the Electric Fuel Lift
Pump (EFLP) is operating. Make sure that fuel lines between the
EFLP and the TPIR are not blocked or kinked.
Return lines Result: The TPIR return line or the fuel lines between
the EFLP and the TPIR are blocked or kinked.
Repair: Clear or replace the blocked line.
Result: The TPIR return line and the fuel lines between
the EFLP and the TPIR are clear.
Repair: Replace the EFLP.
If the fault is still present, contact the DSN and provide
the Warranty Report, PSR and Snapshot Data as saved
in steps 1 and 2.
11. Low Fuel Rail Pressure
A. Visually check the fuel tank for fuel.
Note: The fuel gauge may be faulty.
B. Inspect the high-pressure fuel system for leaks.
C. Use the electronic service tool to perform the “High Pressure
Fuel Pump Calibration” .
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 or not correctly
installed.
G. Replace the in-line fuel filter that is installed upstream of the
Electric Fuel Lift Pump (EFLP).
H. Check that the EFLP is operating correctly.
I. Replace the primary fuel filter and the secondary fuel filters. Re-
fer to the Operation and Maintenance Manual for further
information.
J. Check for air in the fuel system and that the fuel system is
primed.
K. Check the diesel fuel for contamination. Refer to Systems Op-
eration, Testing, and Adjusting, “Fuel Quality - Test”.
L. Use the electronic service tool to perform the “Fuel Rail Pres-
sure Relief Valve Test” .
Note: This test will identify excessive leakage through the Pres-
sure Limiting Valve (PLV) in the fuel rail.
Low-pressure fuel
system
Result: There is a leak from the high-pressure fuel
system.
Repair: Rectify any fuel leaks.
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 or
not correctly installed.
Repair: Install the fuel lines correctly. Replace any dam-
aged or restricted fuel lines.
Result: The EFLP is not operating correctly.
Repair: Investigate the fault with the EFLP. Refer to
Troubleshooting, “Fuel Transfer Pump - Test”.
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: “Fuel Rail Pressure Relief Valve Test” fails
Repair: Replace the Fuel Rail Pressure Relief Valve.
Refer to Disassembly & Assembly, “Relief Valve (Fuel) -
Remove and Install”.
(continued)
198 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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