I store with full tank on my rig and circulate fuel with EV fuel conditionner and carbon guard. never had a problem at start up after 6 month later in the Spring Unless you had bad fuel I doubt fuel is your problem but no harm in trying a new batch..
what is critical at start up is the suction from the crankcase used to pull fuel on top of the carb and down behind the throttle pate.
even if you ran fine last year doesn’t take much to plug those fine holes (3) below the dime size plug as well as that very small channel sending fuel on top. try openning the idle needle a bit make certain you have decent pull from the crankcase by placing your hand or apiece of paper in front of the carb.
https://www.youtube.com/watch?v=MfTpU6HS4cA
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