I have a pretty new Troy-Built TB5ET weedeater that needed fuel lines. I bought 5 feet of vinyl tubing at ACE hardware and hooked them up identically to my other weedeater that is the same model. The problem is that it wont get very much feul in the brand new primer i bought. Sometimes it will start at high speeds w/out throttle and will run for about 15 seconds. Please help.