Primer bulb is pumping gas in the wrong direction on your craftsman 25cc weedwacker?

I could assume this problem may lie in the pressure used on the primer bulb. Try steady, slower pressure on the bulb... . New info. Just was working on my neighbors unit. same problem. we thought it was dirt clogging carburator. cleaned every thing and blew air through everything. still no prime fuel to the carb. got looking around and all the fuel lines in the tank had disintegrated from setting in the garage for a few years with fuel in the system.