I have a Poulan Weedeater Featherlite Plus that will not continue to run. It seems as though the tank gets pressurized and when I open the gas cap there is a surge of air into the tank. I don't know if this is supposed to happen or not. There are 2 tubes into the gas tank from the carburetor. One is short and the other goes clear to the bottom of the tank and into the gas. I can pour gas into the carburetor and it will start and run for 5 seconds or so at full power then just dies out. HELP!!!

ballengerb1

The short tube vents the carb and tank to allow easy flow of the fuel. The longer tube is your supply and usually has a clunker on the end so the fuel supply is uninterrupted when the eater is moved into different positions. Check to see that the clunker is still in place.