ERRATIC FUEL GAUGE READING ELECTRONIC INSTRUMENT CLUSTER

1985-86 PONTIAC 6000 STE, AND 6000 WITH U52 (ELECTRONIC INSTRUMENT CLUSTER) AND LB6 ENGINE

"Please discard previous bulletin 86-8-7 and replace with 86-8-7A due to a text revision."

CONDITION:

--------- The 1985-86 Pontiac 6000 STE, and 6000 with U52 and LB6 engine may show an incorrect fuel level reading. Two bars of the fuel gage may still be showing when the tank is empty.

CAUSE:

----- Insufficient ground at the fuel pump and fuel sender.

CORRECTION:

---------- Add an additional ground wire as shown in the procedure below:

1. Disconnect negative battery cable. 2. Raise vehicle. 3. Locate fuel pump/fuel sender connector as shown in illustration. The connector is just above the rear axle. Remove connector from white connector holder. 4. Disconnect sender connector from body connector. 5. Locate black wire in cavity A of sender connector (sender connector has a yellow body). Cut this wire about 3" (75mm) back from connector body. Splice in a 6" (150mm) length of 14 gauge wire. Solder the splice, and seal with heat shrink tubing or electrical tape. Solder a ring-type connector to the other end of the wire. 6. Attach the wire to the underbody support. The ground for the electronic level control can be used for this attachment, or use a hole in the underbody support. A star washer under the ring connector and self-drilling screw should be used to insure a good ground. 7. Reconnect sender connector to body connector. Replace connectors in white holder. 8. Lower vehicle. 9. Reconnect negative battery cable.

If the above procedure does not correct the condition, the fuel tank should be removed and the sender float checked for interference with the sender filter.

The parts book also lists the incorrect part number for the fuel pump. The correct part number is 25090484.

Labor Operation Number: T3145

Labor Time : .3 hrs.

General Motors bulletins are intended for use by professional technicians, not a "do-it-yourselfer". They are written to inform those technicians of conditions that may occur on some vehicles, or to provide information that could assist in the proper service of a vehicle. Properly trained technicians have the equipment, tools, safety instructions and know-how to do a job properly and safely. If a condition is described, do not assume that the bulletin applies to your vehicle, or that your vehicle will have that condition. See a General Motors dealer servicing your brand of General Motors vehicle for information on whether your vehicle may benefit from the information.