I think it is the same strimmer as mine. follow the steps below.
1, move switch on handle to RUN.
2, press fuel feed a few times(see through bubble)
3, move three way switch to choke
4, pull start cord once
5, move three way switch to middle
6, pull start cord. Strimmer should start. If not go to step 3
7, Once started wait 10 seconds then move three way switch to its 3rd position.
After the winter I find I always forget step 1
Hope this helps
Ian, June 2007