VITON ACCELERATOR PUMPS USAGE SERVICE REPLACEMENT ONLY

Viton accelerator pumps are now available from WDDGM for service when a customer uses a high aromatic fuel, such as gasohol or stores the vehicle for long periods of nonoperation.

Two (2) types of viton accelerator pumps are available and must be used in the correct float bowl assembly.

Float bowl assemblies that have the letters "MW" (machined well) embossed next to the throttle position sensor electrical connector, use the red lip (with garter spring) viton accelerator pump only. Some 1982-1983 carburetors with a machined well (MW) used during production, were assembled with the red viton pump. If the carburetor does not have the red viton pump, a blue dot will be on the rear of the throttle body base near the mounting hole (see Figure 1 below).

If the letters "MW" are not on the float bowl assembly (nonmachined or tapered well) a blue, thin lip accelerator pump should be installed. Use the parts list (attached to this bulletin) to select the correct accelerator pump (see Figure 2 on the reverse side).

Viton service replacement pumps are identified as H.D. (heavy duty) in the parts catalog.

NON-MACHINED WELL MACHINEDWELL (MW) (TAPERED)

Red Lip Blue-Thin Lip (With Garter Spring) (No Garter Spring) (17072978) (See Attached List)

REPLACEMENT VITON PUMP ASSEMBLIES FOR 1975-1982 NON-MACHINED WELL DUALJET AND QUADRAJET CARBURETORS

CARBURETOR REPLACEMENT CARBURETOR REPLACEMENT NUMBER PUMP ASSEMBLY NUMBER PUMP ASSEMBLY - 1975 - - 1980 (Continued) - 7045240 17074106 17080240 17074104 7045244 17074109 17080241 17074104 7045246 17074109 17080242 17074104 7045541 17074106 17080243 17074104 7045544 17074109 17080244 17074104 7045548 17074106 17080247 17074104 17080249 17074104 - 1976 - 17080491 17074104 17056240 17074106 17080493 17074104 17056244 17074109 17080495 17074104 17056246 17074109 17080496 17074104 17056540 17074106 17080498 17074104 17056544 17074109 17080540 17074104 17056546 17074109 17080542 17074104 17080543 17074104 - 1977 - 17080545 17074104 17057241 17074109 17055242 17074109 - 1981 - 17057248 17074109 17081190 17074104 17081191 17074104 - 1978 - 17081192 17074104 17058192 17074104 17081193 17074104 17058240 17074104 17081194 17074104 17058241 17074109 17081196 17074104 17058246 17074109 17081197 17074104 17058249 17074106 17081198 17074104 17058498 17074104 17081199 17074104 17058540 17074104 17081242 17074104 17081243 17074104 - 1979 - 17081245 17074104 17059180 17074104 17081247 17074104 17059184 17074104 17081248 17074104 17059190 17074104 17081249 17074104 17059191 17074104 17081289 17074104 17059193 17074104 17081294 17074104 17059194 17074104 17081295 17074104 17059196 17074104 17081492 17074104 17059240 17074104 17081493 17074104 17059241 17074109 17081496 17074104 17059242 17074104 17081497 17074104 17059243 17074104 17059247 17074106 - 1982 - 17059249 17074106 17082183 17074104 17059491 17074104 17082192 17074104 17059492 17074104 17082194 17074104 17059496 17074104 17082195 17074104 17059498 17074104 17082196 17074118 17059540 17074104 17082197 17074104 17059543 17074104 17082243 17074104 17059544 17074104 17082244 17074104 17059546 17074104 17082245 17074104 17059547 17074104 17082246 17074104 17082247 17074104 - 1980 - 17082248 17074104 17080185 17074104 17082249 17074104 17080187 17074104 17082260 17074104 17080190 17074104 17082294 17074104 17080191 17074104 17082295 17074104 17080192 17074104 17082298 17074104 17080195 17074104 17082299 17074104 17080197 17074104 17082492 17074104 17080199 17074104

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.