FUEL GAUGE READS APPROX. 1/8 TANK WHEN EMPTY-BEND FLOAT ARM

SUBJECT: FUEL GAUGE READS APPROXIMATELY 1/8 TANK WHEN EMPTY (BEND FUEL SENDER FLOAT ARM)

VEHICLES AFFECTED: 1990-92 CHEVROLET BLAZER (S/T), GMC JIMMY (S/T), OLDSMOBILE BRAVADA (T)

This bulletin cancels and replaces bulletin #90-8-275 issued Feb.29/92.

Some owners of 1990-92 S/T Utilities may experience inaccurate fuel gauge readings. If this condition is encountered, the fuel gauge will read 1/8 of a tank on the gauge when the tank is empty. This condition is caused by the fuel sender float contacting the bottom of the fuel tank, and can be corrected by bending the fuel sender's float arm. The float arm must be bent so that the float arm angle is approximately 87 degrees. Figure 1 demonstrates the fuel sender before and after the bending procedure. When correctly bent, the float arm angle will match the template included in this bulletin.

***************************************************************************** *STG DISCLAIMER*

"THE TEMPLATE DISPLAYED IN THIS SERVICE PUBLICATION IS NOT INTENDED FOR USE" (Please refer to the actual publication for an accurate "TEMPLATE" to use in this service procedure.) ****************************************************************************

SERVICE PROCEDURE:

Important: Before servicing the fuel sender, proper diagnosis of the fuel gauge must be performed according to "DIAGNOSIS OF THE FUEL GAUGE" of the appropriate Service Manual.

1. Remove the fuel tank as outlined in the "FUEL TANK Replacement" section, of the appropriate Service Manual.

2. Remove the fuel sender assembly as outlined in the "FUEL PUMP Removal" of the appropriate Service Manual.

3. Using the template provided, check the float arm angle (Figures 2 and 3). If the angle does not match the template, grasp the fuel sender with pliers as shown in Figure 4 and bend the float arm until it matches the template (angle equals 87 degrees).

DAMAGE TO THE GAUGE READOUT WILL OCCUR IF THE SENDER IS NOT HELD PROPERLY DURING THE BENDING PROCEDURE.

4. Install the fuel sender assembly as outlined in the "FUEL PUMP Install" section, of the appropriate Service Manual.

Important: THE FUEL SENDER SEAL RING MUST BE REPLACED (P/N 3893116).

5. Install the fuel tank as outlined in the "FUEL TANK Replacement" section, of the appropriate Service Manual.

Important: TIGHTEN THE UPPER TANK STRAPS LAST, TORQUE TO 5.5-8.0 N.m. 4.0-6.0 ft. lbs.)

SERVICE PARTS INFORMATION

Part Number Description Qty. ----------- ----------- --- 3893116 Fuel Sender Seal Ring 1

WARRANTY INFORMATION

For vehicles repaired under warranty use:

Labour Operation: L1225 Labour Time: 1.5 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.