VITON Accelerator Pumps - Now Available: Overview
Model Year 1983Bulletin No. 83-103
File In Group 64
Number 9
Date Apr. '83
SUBJECT: Viton Accelerator Pumps
MODELS: Current and Past Models Equipped With Dual and Quadrajets - 1975-83
Viton accelerator pumps are now available from WDDGM for service when a customer is using a high aromatic fuel, gasohol or has dry-out conditions stemming from long periods of non-operation.
Two (2) types of viton accelerator pumps are released and must be used in the correct float bowl assembly.
FIGURE 1 - (DUALJET SHOWN):
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. See Figure 1.
Some 1982-83 "MW" float bowl assemblies used during production were assembled with the red viton pump and some were not. If the float bowl assembly does not contain the red viton pump a blue dot will be on the rear of the throttle body near the bolt hole. See Figure 1.
If the letters "MW" are not on the float bowl assembly a blue, thin lip accelerator pump can be used per the part list included with this bulletin. This float bowl assembly has the non-machined pump well and uses the blue, thin lip accelerator pump only.
FIGURE 2 - VITON ACCELERATOR PUMPS:
Viton service replacement pumps are identified as H.D. (Heavy Duty) in the parts book and are shown in Figure 2.
Applications are as follows:
Red Lip (With Garter Spring) Machined Well Only (MW)
Blue, Thin Lip Non-Machined Well Only
Dual and Quadrajet pump part numbers:
Red Lip (With Garter Spring) 17072978
Blue, Thin Lip See Parts List