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fill it with the correct fuel, switch it on , use the primer bulb until you feel fuel in the bulb ( excess will flood the engine )
pull the start cord a few times
if not starting , remove the plug and clean
if wet with fuel leave the plug out , hold the throttle full open and pull several times to remove excess fuel
replace plug, hold the throttle wide open and pull several times
try this hold the throttle open all the way then choke it or primer if you have one then pull stat it . it should start up this is a trick that lawm mower tech use to start badly flooded trimmers are new trimmers that have not start it gets them to start right up so they can adjust the carburator so they will run this might help you to start the new trimmer you have
Those direction are not accurate all the time, I usually prime mine 4-6 times. put mine on full choke with the trigger pressed and pull 1 time any more will usually flood it, If you have the choke that kicks off after you press the trigger, put the choke back on to half and pull the cord pressing the trigger, Then pull the cord until it starts without pressing the trigger. As before if you press and hold the trigger during the start it will flood these trimmers..This should start the trimmer. You may have to let the trimmer set for about 15 min if it was flooded.
Definitely sounds like a fuel delivery issue. It may be time to install a diaghram kit or rebuild kit on the carb. The sensitive internal parts don't last forever. You can check for flooding immediately after by pulling the plug. If it is real wet, either the plug isn't firing to its full potential or the carb is indeed flooding.Those carb kits aren't too hard to install and you may be able to get by with just the cheaper diaghram kit.
Is there an air lock in the line. Remove the lines and insert only one at a time and see if one will take fuel and the other none?
Also, check carb float to make sure its not stuck open intaking fuel constantly flooding bowl
It is unusual for a trimmer to flood itself. It is common to have a lean condition diagnosed as rich.
So lets start by seeing if its lean or rich. Get unit running and apply as much throttle as possible and keep unit running then slowly close the choke. If unit starts to run better as choke is closed then it is lean. If unit dies immediately and is hard to start again it may be flooded.
4 possible reasons for flooding...
1. piece of debris in inlet needle, needle lever adjusted too high
2. adjustment screwd turned too far out
3. exhaust screen clogged
4. low compression
If unit has a stuck inlet needle it will flood while engine is off and be very difficult to start- remove fuel source and/or turn adjustment screws all the way in and pull rope until unit starts ( 4 or 5 times)
clean the carb, screws should start at 1 and 1/2 turns out on the low and 1 turn out on the high.
clean the screen.
If the unit has low compression it is not worth repairing- the cost of repair will exceed the cost of replacement.