Strangest thing ever...

So i got a HKS SSQ Bov which has only been on the car for 6 months so its close to new. I installed it when i had my gt28rs installed and it worked fine but after i rebuilt the motor and installed the gt2871r the bov just doesnt want to work. I removed it on the weekend pulled it apart completely, cleaned it up and made sure nothing was broken inside. All seams fine so i put it back on the car and the dam thing still doesnt wanna work. So i check vac lines, tried 2 different hoses and 3 different points of Vac and still doesnt work.

Anyone have any idea's they think might be causing this?