Vacuum Switch Ports

chevrolet
s-10

#1

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?


#2

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

Tester


#3

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