Instruments - Fuel Tank is Empty, Gauge Reads 1/8

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GMC NUMBER: 92-6C-42(A)

GROUP: 6C Engine Fuel

DATE: April 1992

CORPORATE
NUMBER: 166305R


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

MODELS:
1990-1992 S/T UTILITY TRUCKS


PUBLISHED IN JANUARY 1992. IT WAS REVISED TO CORRECT THE LABOR THIS BULLETIN CANCELS ANO REPLACES GMC TRUCK BULLETIN 92-6C-42,

OPERATION NUMBER. ALL COPIES OF 92-6C-42 SHOULD BE DISCARDED.


Some owners of 1990-92 S/T utility trucks 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 is due to the fuel sender float contacting the bottom of the fuel tank. The condition 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.

When correctly bent, the float arm angle will match the template included in this bulletin.

SERVICE PROCEDURE:

Important

Before servicing the fuel sender, proper diagnosis of the fuel gauge must be performed according to "DIAGNOSIS OF THE FUEL GAGE" Section 8C-7 in the 1992 Sonoma and Jimmy Service Manual, number X-9229.

1. Remove the fuel tank as outline "Fuel Tank Replacement," page 4-66 in the 1992 Light Duty Truck Fuel and Emissions Service Manual, X-9236.

2. Remove the fuel sender assembly as outlined in "Fuel Pump Removal," page 4-61 in the 1992 Light Duty Truck Fuel and Emissions Service Manual, X-9236.








3. Using the template provided, check the float arm angle (Figures 1 and 2). If the angle does not match the template, grasp the fuel sender with pliers as shown in Figure and bend the float arm until it matches the template (angle equals 87 degrees).

NOTICE:
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 "Fuel Pump Install," page 4-61 in the 1992 Light Duty Truck Fuel and Emissions Service Manual, X-9236.


Important

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

5. Install the fuel tank as ouflined in "Fuel Tank Replacement," page 4-66 in the 1992 Light Duty Truck Fuel and Emissions Service Manual, X-9236.

Important

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


SERVICE PARTS INFORMATION:

Part Qty.
Number Description
3893116 Fuel Sender Seal Ring 1

Parts are currently available from GMSPO.


WARRANTY INFORMATION:
For vehicles repaired under warranty use:

Labor Operation:
L1225

Labor Time:
1.5 hrs.