Charcoal Canister

All models are equipped with a dual-purge type canister. Two inlets are provided: 1 for the carburetor fuel bowl vapors and 1 for the fuel tank vapors. The outlet is connected to intake manifold vacuum. The 4th nipple (secondary purge) connects to the carburetor spark port.

When the engine is running, manifold vacuum draws fresh air through the inlet filter in the bottom of the canister and purges stored vapors. When ported vacuum reaches 12 in. Hg, the secondary purge circuit is opened, and canister is purged at a much higher rate.