Homelite UT20044B won't stay running

Well I'm new to gas powered trimmers so I'm not sure what's going on.



I pumped the primer button, and pulled the string only for the trimmer to die. Finally it would run but when I put the choke to half choke or run it dies. Am I doing something wrong? I've only had electric trimmers before so this is new to me.



Not sure if something's wrong or if I'm just not doing something right.



Thanks for any information!