RE: two lines on Poulan 25cc from carb to tank !
Yes, the one from Horizon is better. Also, yes, leave the primer bulb on and just ignore it. In your case, I would leave the choke on the carb. In cooler weather in Conneticut you will probably find that the engine will like to run at half choke for a while to warm up, at least on the first start of the day. Further, engines running Gas/Glow take a bit longer to warm up as they inherently run cooler than straight gasoline engines.
That is something for everyone to remember as well when tuning your engine. Make sure it is fully warmed up before adjusting, and that can take a little while, even in the summer.
AV8TOR