Table 68
Troubleshooting Test Steps
Values Results
7. 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 fil-
ter 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 Il-
lustration 48 or 49 .
EFLP flow Result: The fuel flow is below the minimum value for the re-
corded voltage.
Repair: Replace the EFLP. Refer to Disassembly and As-
sembly, “Fuel Priming Pump - Remove and Install ”.
Result: The fuel flow is above the minimum value for the
recorded voltage.
Proceed to Test Step 8.
8. 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 9.
(continued)
UENR4469-36 137
Symptom Troubleshooting
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