My primer is hooked up with both lines. I primed the snot out of my recent Ryobi conversion trying to get it started, and even with the electric starter didn't get a pop. The primer only fills the carb with gas -- it doesn't seem to inject any into the carb bore. Now that I've I put the modified choke blade on, it fires right up. Very easy to start now with my standard Sullivan stater. It still won't start by hand worth a flip (pun intended...)