Hi,
Yes most common fault, we put our strimmer away for the year and go to start it in the new season and it won’t fire.
Quickest way to eliminate ignition faults ie no spark, get some carburettor cleaner about £5-6 (protect your eyes please do I didn’t)
Air filter carb cover off and one squirt,
Try to start it... if it fires briefly then it’s fuel issues.
Give the general area a good clean and blow deposits away, taking care around the carb.
Now...
Firstly drench the carb with cleaner.
Starting at the tank.
Wash it out thoroughly.
Clean the filter with carb cleaner to remove solidify particulates and blow with compressed air or replace.
Check fuel lines and primer bulb for splits. Replace if found.
Now fill with fresh fuel, don’t use fuel from last year or the last from your mixed bottle.
Now try it!