FUEL TANK NOISE, FUEL GAGE INACCURATE. GMC Truck GMC Suburban

SUBJECT: FUEL TANK NOISE, FUEL GAGE INACCURATE, REDUCED FUEL CAPACITY (REPLACE FUEL TANK FILL CAP)

MODELS: 1992-95 CHEVROLET AND GMC TRUCK C/K MODELS WITH 6.5L DIESEL ENGINES (VINS F, S - RPOS L56, L65)

CONDITION:

SOME OWNERS OF THE ABOVE MODELS WHICH OPERATE IN VERY DUSTY ENVIRONMENTS MAY COMMENT ON ANY OF THE FOLLOWING CONDITIONS: A NOISE EMANATING AT THE FUEL TANK WHICH MAY BE THE SOUND OF THE FUEL TANK "OIL CANNING"; REDUCED FUEL TANK CAPACITY; INACCURATE FUEL GAGE READINGS.

CAUSE:

THE FUEL TANK FILL CAP VENT MAY BECOME CLOGGED WITH DIRT ON SOME DIESEL MODELS OPERATING IN VERY DUSTY ENVIRONMENTS. THE CLOGGED FILL CAP VENT MAY RESTRICT THE FUEL TANK FROM PROPERLY VENTILATING. A NEGATIVE PRESSURE MAY DEVELOP IN THE FUEL TANK, CAUSING THE FUEL TANK TO "OIL CAN" AND POSSIBLY COLLAPSE INWARD.

CORRECTION:

A REDESIGNED FUEL TANK FILL CAP IS AVAILABLE. THE NEW FILL CAP HAS A FILTER WHICH WILL SIGNIFICANTLY REDUCE THE POSSIBILITY OF CLOGGING. AS PART OF REGULAR MAINTENANCE, THE FUEL TANK FILL CAP SHOULD BE REPLACED EVERY 25,000 MILES ON DIESEL EQUIPPED TRUCKS OPERATING IN VERY DUSTY ENVIRONMENTS.

PARTS INFORMATION

P/N DESCRIPTION QTY

15726010 FUEL TANK FILL CAP 1

PARTS ARE EXPECTED TO BE AVAILABLE FROM GMSPO ON 7/31/95.

WARRANTY INFORMATION

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME L1020 FUEL TANK FILL CAP USE PUBLISHED LABOR OPERATION TIME

FIGURES: 0

CAPTIONS:

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.