Sounds like the carb is getting clogged. Drain the old fuel and make sure the fuel filter is attached to the fuel hose inside the fuel tank. SeaFoam or a product called Start will sometimes clean the carburetor. If not, you will need to have the carb rebuilt, flushed or replaced.
Also, check your muffler and spark arrest, sometimes if they are clogged, you will have a similar issue.
SOURCE: Trimmer starts immediately, then stops
How old is the trimmer? If still under warranty, Sears can fix this. If not, then my experience has been the problem is a bad coil. This is due to heat build up. When the coil gets hot, it shorts out.
SOURCE: Homelite Mighty Lite Lawn Trimmer Magneto Air Gap setting 25cc
Normall setting is 10 thou but if there is no play in the crank bearings you can set at 8 thou
SOURCE: Craftsman gas 25cc weedwacker starts, runs a few secs, then dies
The gas take up line is disconnected or is broken. I have the same problem and need to find a diagram to fux it.
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