tradecki

I have a 91 witha 351w carbed and i was windering. I took of the charcoal canister and my buddy told me to plug up the vapor line that leads tot the cansiter. I thought that will prussurize the tank and thats not good. I read there is a check valve on the tank and thats the in i need to plug up. I as wondering if i can just run that line to my carb on the vac. that sucks in .