Trimmer starts immediately, then stops

Try leaving the chokey partially engaged. Operate it this way for a few minutes until the engine is thoroughly heated then move to the run position. If this does not work return it.

the warmth to the carburetor will cause dirt to expand inside causing this to happen. Usually after 2 to 3 years these caburetors are no longer good to use. A new one will be better to have to run your trimmer
Walbro makes these caburetors and nobody likes to service them for their size is small and the cost is far cheaper to replace than fix

Check you are putting enough oil in the gas. You should be using 2% oil or 1 to 50 oil / gas

Here is a link to one of my Tips:
www.fixya.com/support/r6081786-trimmer_weed_eater_only_runs_10_15

This should solve the problem.

Jim

Make sure the line is near the botto ofthe tank.Thanks you for asking and I hope it helps.Please leave me a 4 thumbs up.

does it have a fuel filter, or air? If it does make sure they are both clean and free of debris as priming will force fuel up line but will die as soon as its burned out

Sounds like you will need to clean your carburetor.
Sometimes you can get by with priming it a few times, and letting it
run a few times like that and it will flush the gunk out of the jets,
but most of the time you will need to rebuild the carburetor.
If the mower is over a couple years old, then I also recommend that you
buy and install a new carburetor repair kit, because the diaphragm will
get hard and that will cause it to be hard to crank.
When you clean your carburetor and remove the jet screws, count the
number of turns it takes to seat the jets from their original position.
That way when you go to put the jets back in, you know how many turns
they were in/out.
Please rate me, Thanks
Good Luck, I hope this helped

Most 2 cycle engines are basically the same. The primer button has two lines coming from it. Gas is actually s.ucked thru the carb and not pushed thru when you prime it. Take a look at the sketch I provided and hopefully you will get yours running again.

Replace all of the lines before any adjustments, too small to see air leaks are a common cause the issue you have.

There are two screws on the carb. 1 is Lo rpm air/fuel ratio and the other is hi rpm. Try adjusting the lo rpm screw counter-clockwize a 1/2 turn at first, more if needed. After each adjustment try to start. The other thing you could check is if the float is sticking in the bottom of the carb. which shuts off gas flow if full. There is a screw on the bottom of the carb to drain that float. You can try that also! Good luck man!