GM Service Manual Online
For 1990-2009 cars only

NEW STYLE ACCELERATOR PUMP WITH VITON CUP

SOME 1982 MODEL 2 BBL (E2ME-E2MC) AND 4 BBL (E4ME) CARBURETORS USE A MACHINED (STRAIGHT BORE) ACCELERATOR PUMP WELL. A NEW TYPE ACCELERATOR PUMP WITH A VITON CUP (RED IN COLOR) IS USED IN THESE CARBURETORS. A CARBURETOR WITH A MACHINED (STRAIGHT BORE) ACCELERATOR PUMP WELL, CAN BE IDENTIFIED BY THE PRESENCE OF THE LETTERS "MW" (MACHINE WELL) CAST INTO THE FLOAT BOWL BETWEEN THE BOWL VENT TUBE AND THE THROTTLE POSITION SENSOR BOSS. FIG. 9. REPLACEMENT ACCELERATOR PUMPS WITH VITON CUPS WILL SOON BE AVAILABLE THROUGH WDDGM. SHOULD IMMEDIATE REPLACEMENT BECOME NECESSARY, INSTALL THE CURRENT STYLE ACCELERATOR PUMP. ENGINE V-6 (VIN A,E,4) ACCELERATOR PUMP 17051374 ENGINE V-8 (VIN 8) ACCELERATOR PUMP 17053072

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.