My car has all the evap system, canister, and solenoid valve but as I am seeing on internet, people have [a] solenoid valve on their outlet vent on canister too which open and close by ECU to let the excessive vapor escape.
My car doesn't have that and I am having problem with my car [building] air pressure in the fuel tank.
I am really confused, so that means my gas tank itself has a vent line on it and it is connected to the fuel inlet hose and it evaporates the excessive vapor from there? It doesn't make any sense.
From Comments
In this question I am trying to find out why some cars have vent solenoid valve with their canister and what happens when some don't have that, how do they vent the vapor out then.