Yes I figured it out with a little experimenting, I hate those damn primers as well!
Thats a clever way to plug everything all in one shot!
I hate them things, and there's no reason for it on a saw with a choke and that runs great, and the new one will get ripped open just like this one. Plus if you give it a little shake the fuel will build pressure in the tank very quickly and do the same thing.
That's incorrect. The purpose of the purge bulb is to pull fuel through the lines and carb and pump it back to the tank, removing the air from the system. Building pressure in the tank cannot do that, as it will not push open a properly set inlet needle - thus the line is dead headed and the air cannot move through.
Yea your right there's no return so it just builds pressure in the line against the needle valve where the primer cycles the fuel back to the tank. But in the definition of the word prime as it refers to most mechanics and engines means that there is pressure in the line, such as a mechanical fuel pump driven diesel, if you run out of fuel you lose your prime, or your pressurized fuel charge ready to go through the injectors. (And it really really sucks! Especially when your plowing with a bucket loader in a Nor'easter and have no phone) So shaking the tank works more like a fuel injected engine where it just builds the pressure ready to fill the carb or filling it if it's empty.
