iv got a petrol strimmer (Mccullock)?

my strimmer, i dont now t size ov it, but it was working on t morning, , i used t 2nd time ok, i stop 2 refule, left it 2 cool. after that, it wont start, t pull cord, is lose, . i had 2 start it by full chock, then use t pull cord, 2 get it going, 4 it 2 start. eny help. or is it best 2 get a new, petrol strimmer