Table 98
Troubleshooting Test Steps
Values Results
8. 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 64 or 65 .
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 9.
9. Transfer Pump Inlet Regulator (TPIR) Return Test
A. Make sure that the TPIR return line is not blocked or kinked.
B. Check that the Electric Fuel Lift Pump (EFLP) is operating
correctly.
TPIR return line Result: The TPIR return line is blocked or kinked.
Repair: Clear the TPIR return line or replace the line
Confirm that the fault is eliminated.
Result: The EFLP is not operating correctly.
Refer to Troubleshooting, “Fuel Transfer Pump - Test”.
Result: The TPIR return line and the EFLP are OK.
Proceed to Test Step 10.
(continued)
UENR4469-36 197
Symptom Troubleshooting
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