Digital Fuel Gauge - Erratic Readings

Bulletin No. T 87-46
File in Group 8
Number 52
Corp. Ref. No. 618304
Date Dec. '86
SUBJECT: ERRATIC DIGITAL FUEL GAGE READINGS

MODELS AFFECTED: 1985-86 DE VILLE/FLEETWOOD 1986 ELDORADO AND SEVILLE 1985-86 CIMARRON EQUIPPED WITH DIGITAL CLUSTER

Some 1985-86 De Villes, Fleetwoods, Cimarrons and 1986 Eldorados and Sevilles equipped with a digital fuel gage, may experience one of the following erratic fuel gage reading conditions:

1. The fuel gage will "count down" (decrease in one gallon increments) to a flashing "E" while having sufficient fuel in the tank.

NOTE: The Cimarron fuel remaining bars will disappear until the "low fuel" indicator illuminates with one bar remaining.

2. The fuel gage reads full at all times (1986 C, E, and K only).

ERRATIC FUEL GAGE FAULT TREE:

To diagnose these conditions, refer to the following fault trees and then Chart "A" if replacement of the tank sending unit is required.

Chart A: Fuel Sender Units

Car Type Model Year Engine Type Part Number

J 1985 2.0 25092967
2.8 25092968

1986 2.0 25092971
2.8 25092095

C 1985 4.1 25092964 (1st Design Integral Wires
to RFI Connector)
25092966 (2nd Design Shade Type
Connection To RFI)
1986 4.1 25092972

E/K 1986 4.1 25092308

For warranty purposes, use Labor Operation L1200 to replace the fuel tank gage unit.

Vehicle Time

1985-1986 De Ville and Fleetwood 1.6 Hours
1986 Eldorado and Seville 1.1 Hours
1985-1986 Cimarron .9 Hour