I just upgraded from a single to dual snorkel air cleaner and had to swap the doo-dad the two vacuum hoses connect to. It looks like a temp switch to open or close the vacuum to the thermac.

Since doing the air cleaner swap I started to get lean check error faults which is indicative of a leak. I was wondering if I installed the switch backwards. On the underside of the air cleaner, one of the connections has a big hole and the other a smaller hole. Which hose (to carb or to thermac) goes to which hole?

 

If I recall correctly the carb vaccum goes to the small hole.

 

They go like this.

 

That is the way the hoses are routed. But since you replaced the vaccum switch you could have it inverted. Make sure that the short hose (carb vac) is pluged into the small hole on the switch.

phil