I have a Poulan leaf blower that started giving me problems, I replaced the carb, fuel lines and filter and it ran great for 2 days then wouldn't start unless I put fuel in either the cyld. or the carb but only runs till that gas is used. The primer bulb went down when I tried to prime the blower and just stayed down, wouldn't come back up until I loosened the screws and let air in. I am thinking that something got in the carb and is causing the problem but I don't know much about small engines so I am hoping to get some help from someone more knowledgeable than me. When I replaced the fuel lines I left them both long inside the fuel tank because the old lines were broken down and I couldn't tell how long the old lines were. There are 2 different size lines running to the fuel tank, it looked like the filter went on the smaller line, I ASSUME this because when it was running ok I could see the air bubbles going from the carb to the tank in the larger line when it was being primed.........but since the filter was loose in the tank I am not sure which line it should be on. This is a Poulan WT200 blower.