Canister Control Valve (CCV)

There are 2 types of vacuum operated canister control valves. In some applications, more than one type may be used on the same system.

The type 1 control valve is vacuum operated and is an integral part of the carbon canister (Y Body). When the engine is not running, vapor from the fuel tank is stored in the carbon canister. When the vehicle is started, vacuum to the upper port will draw in the internal vacuum diaphragm, opening the port between the canister and purge vacuum.

The type 2 control valve is similar to the type 1 valve, except it is located in the canister purge lines itself (5.0L VIN Y). When vacuum is applied to the upper port of valve, diaphragm is lifted, opening port between purge vacuum and accumulated vapors. When engine is off, valve diaphragm is closed by internal spring pressure, preventing vapor from venting to atmosphere.