How to get fuel to the carb?

I have a weed eater FL20 and I cannot get the fuel through to the carb. When I prime the weed eater it will start ok, but the motor will shut down once this primer gas is used up, the motor do not get anymore gas, therefore shuts down on me. Also is there a special tool to use to adjust the set screws for the carb. I do not have any tool in my tool box that fit over the set screws to adjust them. I purchased the weed eater at Walmart last summer so it did not get mush use. Can anyone ansewr my questions.

Thanks

Clyde from Newfoundland, Canada