There is a cheetah black drill with three eyes on it. How to connect it?

The adsorption port is connected with the oil tank.

Three ports of the carbon canister are open. Carbon canister generally has three interfaces: atmospheric port, adsorption port and desorption port. The atmospheric port does not need to be connected to any pipeline, the adsorption port is connected to the oil tank to recover the steam in the oil tank, and the desorption port is connected to the intake manifold through the carbon canister solenoid valve.