ISSUE Some 2005-2006 Mustang vehicles may have an erratic fuel gauge
concern (does not read Full or reads Empty when tank is full). This may
be caused by poor electrical connections at the fuel sender, at the in
line harness connector, and/or faulty fuel sender card. ACTION Follow
the Service Procedure steps to correct the condition.
SERVICE PROCEDURE NOTE BE SURE TO CHECK FOR DTCs IN ALL OTHER MODULES.
NOTE AFTER A FUEL FILL UP, THE TIME FOR THE FUEL GAUGE TO MOVE FROM
EMPTY (E) TO FULL (F) RANGES FROM 2 SECONDS TO 55 MINUTES DEPENDING ON
WHICH OPERATING MODE THE FUEL GAUGE IS IN. SEE WORKSHOP MANUAL (WSM),
SECTION 413-01 FOR DETAILS. 1. Check for DTCs in all modules. Perform
normal WSM, Section 413-01 diagnostics, for any fault codes retrieved.
If normal diagnostics do not lead to concern resolution, then continue
with this TSB. 2. If the diagnostics in WSM, Section 413-01 indicate
that the fuel sender is at fault, then replace the appropriate fuel
level sensor per WSM, Section 310-01.
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