FUEL STARVATION-LINE HAMMER FUEL PUMP-FUEL RESTRICTOR

SOME "A" AND "X" WITH THE 2.8L V-6 ENGINE MAY EXPERIENCE FUEL STARVATION DURING HIGH AMBIENT TEMPERATURES (ABOVE 80 DEGREE F). THE CONDITION USUALLY OCCURS WHEN AN ATTEMPT IS MADE TO RESTART A VEHICLE FOLLOWING A 15/20 MINUTE HOT SOAK, OR AN EXTENDED ENGINE IDLE. THE CONDITION IS AGGRAVATED BY WINTER GRADE FUEL, HIGH AMBIENT TEMPERATURES, A HOT VEHICLE, AN EXTENDED ENGINE IDLE TIME, OR A FUEL PUMP WITH LOW OPERATING PRESSURE. TO ALLEVIATE THIS CONDITION, THE FOLLOWING PROCEDURE SHOULD BE FOLLOWED: 1982 "A" OR "X" 1. PERFORM AN ON CAR FUEL PUMP TEST AS OUTLINED IN THE 1982 SHOP MANUAL (BOTH VACUUM AND PRESSURE CHECKS SHOULD BE MADE WITH VEHICLE AT OPERATING TEMPERATURE). 2. IF A PUMP INDICATES LOW IN EITHER THE VACUUM OR PRESSURE CHECK, THEN IT SHOULD BE REPLACED. (FOLLOW REPLACEMENT PROCEDURE OUTLINED IN SHOP MANUAL). 3. IF THE FUEL PUMP TESTS TO SPECIFICATIONS, (REFER TO ILLUSTRATION B) THEN FABRICATE A 1.0MM RESTRICTOR FROM BRASS AND INSTALL IT IN THE RETURN LINE AS SHOWN IN ILLUSTRATION A. NOTE: USE ONLY THE 1.0MM RESTRICTOR ON 1982 MODEL YEAR VEHICLES. ON 1983 VEHICLES ONLY, FOLLOW STEPS ONE (1) AND TWO (2). IN ADDITION VERIFY THAT A 1.5MM I.D. BRASS RESTRICTOR OR THEMAL VALVE IS IN THE RETURN LINE. IF NO RESTRICTOR OR THEMAL VALVE IS PRESENT THEN INSTALL EITHER; RESTRICTOR P/N 14064187 THERMAL VALVE P/N 14077716

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.