pressure fuel tank ?

I just picked up a few old Johnson's and Evinrude's with a metal 6 gal tank.Now I have question on pressure tanks ,the 1 have has a 3 fittings but no primmer. The pics I found 2 different styles tanks 1 with a metal little primmer and with out. Can the tank I have work or do you add in the primmer bulb into the duel line hose?

1553 Evinrude 15hp I started working on getting this one tore down.

1955 Johnson 10hp
1955 Johnson 25hp
1958 Johnson 35hp

Thanks for any help.

The top tank is not a pressure tank. Its a regular tank. I got both tanks. There is only two styles of pressure tanks that I am aware of. One has a metal primer button and the other has a plastic button.

Steve.

I thought the fuel line fitting for the dual line hose would be only used on pressure style tanks? Just trying to find out what I have.

My fuel line just got here, I understand what I have and the difference between the 2.

Thanks

Don't lose that pressure tank. Up in my area those things are bring big bucks. I was at a sale last fall and there were 2 of them on there and the same guy bought both of them. He paid like 70.00 for each tank