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Vacuum Switch Ports

I am working on a 1991 Chevrolet S10.
It has a thermal vacuum switch for the charcoal canister.
I just noticed that the “E” port of the switch is connected to the canister, and the “C” port is connected to the intake.
I believe it should be the other way around. Or does it make a difference?

If you look under the hood, there should be an emissions sticker that shows the routing of the vacuum hoses.


It may not make a difference even if the lines are on the wrong way.