Table 100
Troubleshooting Test Steps
Values Results
14. 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 calibrated
container.
E. With the keyswitch in the ON position, measure the input volt-
age 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 Illus-
tration 69 or 70 .
EFLP flow Result: The fuel flow is below the minimum value for
the recorded voltage.
Repair: Replace the EFLP. Refer to Disassembly and
Assembly, “Fuel Priming Pump - Remove and Install”.
Result: The fuel flow is above the minimum value for
the recorded voltage.
Proceed to Test Step 15.
15. 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.
i06160419
Fuel Temperature Is High
If either of the following diagnostic trouble codes are
active, perform the procedure that follows:
202 UENR4469-36
Symptom Troubleshooting
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