The fuel lines have rotted and I need to know how to replace them.There is a fuel filter and a small plastic valve and I have no idea how or what they attach to

The easiest way to do this is getthe right size gas line and filter to start.Change each line one at a time and you can't go wrong, most weed wackers the line is just pushed on,no clamps holding them on.Use a utility knife to cut them off at the fitting.Good luck.