If the fuel is 3 years old maybe that's why.
Just like medicine has expiration dates. Fuel should have expiration as well.
Flare guns have expiration dates as far as the flare rounds. And they expired between 3 to 4 years.
So I would imagine that your fuel might have been expired as far as...
To be honest I'm new to but I've had learn some things maybe it could help you.
Will you start the engine does it spit out wrong fuel at idle? If it does and you're having problems starting and not running properly as far as being too rich, lean out the little speed 1/8 of a turn.
Most...