ENGINE HARD START OR NO START (REPL. FUEL PUMP PULSATOR). GMC Truck Safari

SUBJECT: ENGINE HARD START OR NO START (REPLACE FUEL PUMP PULSATOR)

MODELS: 1992-96 CHEVROLET AND GMC TRUCKS 1992-96 OLDSMOBILE BRAVADA WITH GASOLINE ENGINES

CONDITION:

SOME OWNERS MAY REPORT THEIR ENGINE IS HARD TO START OR WILL NOT START.

CAUSE:

THE FUEL DELIVERY SYSTEM MAY HAVE LOW OR NO PRESSURE DUE TO A RUPTURED FUEL PUMP PULSATOR. THE PULSATOR IS THE FLEXIBLE CONNECTOR BETWEEN THE FUEL PUMP AND THE METAL FUEL LINE IN THE TANK. THIS RUPTURE APPEARS AS A TEAR IN THE PULSATOR OPENINGS AND IS THE RESULT OF EXPOSURE TO GASOLINE CONTAINING A HIGH PERCENTAGE OF ETHANOL.

CORRECTION:

FOLLOW THE STRATEGY BASED DIAGNOSTIC STEPS FOR THE REPORTED SYMPTOMS. IF DIAGNOSIS REVEALS LOW OR NO FUEL SYSTEM PRESSURE, AND THE FUEL PUMP IS IDENTIFIED AS A POSSIBLE CAUSE, FOLLOW THE SERVICE PROCEDURE FOR, ON-VEHICLE SERVICE, FUEL PUMP, IN THE APPROPRIATE TRUCK SERVICE MANUAL. BEFORE REPLACING THE FUEL PUMP, INSPECT THE PULSATOR FOR SIGNS OF TEARS OR LEAKS. IF THE PULSATOR IS DAMAGED, REPLACE IT WITH P/N 25175836 AND RE-TEST THE FUEL SYSTEM FOR NORMAL PRESSURE. THIS PULSATOR IS MADE OF VITON WHICH IS RESISTANT TO ETHANOL CONTENT FUELS. P/N 25175836 REPLACES P/N 25094266 FOR TRUCKS. THIS CHANGE WILL APPEAR IN GMSPO PARTS CATALOGS AS THEY ARE REVISED.

PART INFORMATION:

P/N DESCRIPTION QTY 25175836 DAMPER ASM - FUEL PULSATOR 1

PARTS ARE CURRENTLY AVAILABLE FROM GMSPO.

WARRANTY INFORMATION:

FOR VEHICLES REPAIRED UNDER WARRANTY, USE:

LABOR OP DESCRIPTION LABOR TIME J5590 PUMP, FUEL R+R USE PUBLISHED LABOR OPERATION 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.