I do not have a way to measure pressure in the tank. However, after shutting off the engine, when I disconnect the vent line I hear a hiss for about a second. So there is some pressure in the tank, though I do not know if it is enough.
Fuel spews out of the carb intake. I am fairly certain of that. The air chamber is clean, while there is fuel dripping from the bottom of the carb assembly. Not sure if there are other leaks besides the fuel that comes out of the carb intake.

Alberto