Firebird V8-305 5.0L (1982)
Evaporative Emission Control Canister: Description and Operation
Single Stage Type
Fig. 71 Single Stage Type Vapor Storage Canister
This canister absorbs fuel vapors from the fuel tank through a tube on the canister marked "Fuel Tank" and from an area just above the carburetor
float bowl through a tube marked "Carb Bowl". The storage of fuel vapors occurs when the engine is not running.
During engine operation, fuel vapors pass through a hose connected to the canister tube marked "Purge" and into a port on the carburetor, where
they are mixed with carburetor inlet air and burned during the combustion process.
NOTE: Some single stage type vapor canisters are equipped with two, rather than three tube ports. However, the principles of operation are identical for
both models.
