beech round cap never opened. this valve cover bought from 50's kid he gets them cleaned in a parts washer first. i have some vacuum in the valve cover so i assume the m56 ccv is working. i have a catch can between valve cover and intake holds about 10 ounces maybe. takes like 50,000 miles to fill it up so i think everything's working fine. so the vacuum line i'm taking about is m52tu engine vacuum on top of fuel rail its a metal thin hose with rubber hoses at both ends. one goes to fuel pressure regulator in 3/2 way valve and other side connects to oil separator. with m56 vc separator is disconnected so i had no vacuum to fuel pressure regulator. I routed that hose to top of intake manifold small hose that runs along top of intake connects at front and back. now i have vacuum at pressure regulator still getting codes p1250, 11188,89, 0170,73. i ordered a replacement pressure regulator. the 3/2 valve i have was used too maybe its bad.