Table 85
Troubleshooting Test Steps
Values Results
10. EFLP Flow Test at the Primary Fuel Filter Inlet
A. Make sure the keyswitch is in the OFF position.
B. Disconnect the fuel inlet connection from the primary fuel
filter head.
C. Install a suitable blank on the fuel inlet port on the primary
fuel filter head.
D. Place the open end of the fuel inlet line in a suitable cali-
brated container.
E. With the keyswitch in the ON position, measure the input
voltage at the EFLP. Record the result.
F. With the keyswitch in the ON position, measure the flow
from the fuel inlet line. Record the result.
G. Check the recorded voltage and fuel flow on the graph in
Illustration 58 or 59 .
EFLP flow Result: The fuel flow is below the minimum value for the re-
corded voltage.
Repair: Replace the EFLP. Refer to Disassembly and Assem-
bly, “Fuel Priming Pump - Remove and Install”.
Result: The fuel flow is above the minimum value for the re-
corded voltage.
Proceed to Test Step 8.
11. 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 be-
tween 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, proceed to Test Step 12.
12. Low Compression (Cylinder Pressure)
A. Perform a compression test. Refer to Systems Operation,
Testing, and Adjusting, “Compression - Test”.
Cylinder
compression
Result: The results of the compression test are outside the
specifications.
Repair: 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
Result: The results of the compression test are OK.
Proceed to Test Step 13.
(continued)
168 UENR4469-36
Symptom Troubleshooting
Copyright of Perkins Engine Company Limited. NOT FOR REPRINTING OR RESALE
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