Firebird V8-305 5.0L (1982)
Accelerator Pump: Technical Service Bulletins
Accelerator Pumps, VITON - Two Types Available
Number 83-I-70
Section 6 Date 05/83
Subject:
VITON ACCELERATOR PUMPS FOR ALL 1975-1983 MODELS EQUIPPED WITH DUALJET OR QUADRAJET CARBURETORS
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...
Figure 1
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).
Figure 2
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.
