FUEL LEAK FROM VAPOR CANISTER WHEN PARKED. Chevrolet Chevy G Van 1996

SUBJECT: FUEL LEAK FROM VAPOR CANISTER WHEN PARKED ON INCLINE OR WITH FUEL TANK FULL (REPLACE FUEL VAPOR CANISTER AND ROLLOVER VALVE ASSEMBLY)

MODELS: 1996-97 CHEVROLET AND GMC G MODELS

CONDITION:

SOME OWNERS OF THE ABOVE VEHICLES MAY REPORT A SLIGHT FUEL LEAK FROM THE FUEL VAPOR CANISTER OR MORE LIKELY THE SMELL OF GASOLINE IF THE VAN HAS A FULL TANK OF FUEL AND PARKED ON AN INCLINE WITH ITS FRONT LOWER THAN ITS REAR.

CAUSE:

THE FRONT ROLLOVER VALVE, LOCATED IN THE ROLLOVER VALVE ASSEMBLY ON TOP OF THE FUEL TANK, MAY STICK OPEN IN A NEAR VERTICLE UPRIGHT POSITION. THIS MAY NOT BLOCK FUEL FLOW FROM THE TANK TO THE FUEL VAPOR CANISTER UNDER THE ABOVE CONDITIONS.

CORRECTION:

REPLACE THE FUEL VAPOR CANISTER AND THE ROLLOVER VALVE ASSEMBLY, WHICH INCLUDES BOTH THE FRONT AND REAR VALVES, FOLLOWING THE PROCEDURES DESCRIBED IN SECTION 6E OF THE APPROPRIATE SERVICE MANUAL. THE ROLLOVER VALVE ASSEMBLY CAN BE REMOVED BY LIGHTLY PRESSING DOWN AND THE ROTATING IT 1/4 TURN COUNTER CLOCKWISE.

THE ROLLOVER VALVE ASSEMBLY IS SERVICED BY GMSPO AS A PIPE/VALVE ASSEMBLY.

PARTS INFORMATION:

P/N DESCRIPTION QTY 25172162 PIPE/VALVE ASSY, EMISSIONS 1 17113519 CANISTER, FUEL VAPOR 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME L1228 SENDER ASSEMBLY, FUEL USE PUBLISHED (TANK UNIT) - REPLACE LABOR OPERATION L0620 CANISTER, FUEL VAPOR - REPLACE TIME

IMPORTANT: LABOR OPERATION IS CODED TO BASE VEHICLE COVERAGE IN THE WARRANTY SYSTEM.

FIGURES: 0 CAPTIONS: 0

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.