RE: gas gauge
From AllData:
Fuel Gauge - Inconsistent/Inaccurate Fuel Indication
Article No.
93-26-10
12/22/93
GAUGE - FUEL - ELECTRONIC - INCONSISTENT/INACCURATE FUEL INDICATION - DISTANCE TO EMPTY READING INACCURATE - VEHICLES BUILT BEFORE 10/1/93
LINCOLN-MERCURY:
1993-94 MARK VIII
ISSUE:
Inconsistent or inaccurate fuel indication readings or inaccurate distance to EMPTY readings may be displayed. This occurs because the fuel sender card calibration and message center software programming need revision.
ACTION:
Replace the fuel sender and message center for 1993 models. Replace ONLY the fuel sender for 1994 models experiencing this concern. Refer to the following service procedure.
If Service Manual diagnostics do not identify any concerns, perform the following:
^ 1993 Models - Replace the message center with new part (F3LY-10D898-A). Refer to the 1993 Mark VIII Service Manual, Page 13-08-22, for the removal and installation procedure. Also, replace the fuel sender with new part (F3LY-9275-B). Refer to the 1993 Mark VIII Service Manual, Page 10-01-14, for the removal and installation procedure.
^ 1994 Models - These vehicles were built with updated software in the message center. Replace ONLY the fuel sender with new part (F3LY-9275-B). Refer to the 1994 Mark VIII Service Manual, Page 10-01-10, for the removal and installation procedure.