Is this the intake manifold vacuum?

Ok, so I have the new vacuum tree installed. Per the first picture you can see I have two lines running to the distributor plus a tiny line(leftmost in the picture)...and now I have the big 3/8 line running out the top and an additional 1/4 port that I have taped over right now with electric tape because I don't have a plug for it. I have a 3 foot 3/8 fuel line hose running from the vacuum tree to the brake booster. With this current setup I'm getting a steady 16 psi reading on my vacuum pump gauge and my break pedal is basically going right to the floor.

Is this an indication that I don't have enough vacuum to run the booster after all and need an electric vacuum pump or could it be because it's a fuel line...or because the hose is 3 feet..or because....?? any thoughts?