We may have found other answers which could help you.
Click here for Gas Craftsman Weedwacker
How fuel lines connect between the carburetor, priming bulb and fuel tank ?
replace fuel line ?
Where does the in-tank fuel filter go?
magneto gap?
How to restring craftsman 4.6 amp/Hassle Free Head weedwacker?
17" 24 cc craftsman trimmer primer bulb replacement?