Ahhh the proverbial picture is worth a thousand words. Tank / feed line is way to high the breather line.

Unscrew the venturi put the Needle valve between the cylinder and venturi
Gently bend the tank tube down I used a bit of piano wire inside the brass tube to keep it from bending and closing
You can pass the fuel line thru the firewall to keep it more level with the needle valve.
Use one continuous 1/2A fuel line from tank to engine .