That can in the pic is a vacuum reservoir, it is for the ac/heat system, you should have a vacuum tree with several nipples, one has A/C above it, a line goes across the firewall to a check valve with two more nipples, one to the can you see in the pic, the other through the firewall into the cabin. They should be black.
The vacuum line for the fuel pump regulator comes from the back of the intake to the regulator.
Please use some punctuation in your posts, one continuous sentence is hard to understand.