Gas Tank Vent Manifold

Ok what car BODY are you putting this in? There likely is no need for that mess. It was part of the evap control system (carbon canister) and essentially ties that all together into the line which went up front to the carbon can system. That line going up front IS the vent. There are other ways around that

You want to be careful here as you can create a non-venting problem, or a siphon problem