Stihl FSE 71 Questions & Answers

Push the line in past the first point of engagement. You will feel initial resistance, push a little more. It makes the line engage deeper in the hub and stops the line from coming out.

Open the line storage section by unscrewing the bump down button.
Pull out the storage cartridge and take 2 equal lenghts of cutting line (about 2 m) and thread through each opening on the sides and push in until it goes through to the centre.
Push the cartridge back in ensuring the lines are feeding the top and bottom section and not going to the same section.
Turn the cartridge clockwise and start to wind in the cutting line
You will know you are doing it right because it makes a clicking sound as it turns.
Once you get all the line wound in, screw back the bump down button to keep it all in place again.
Trim the line to ensure both sides are even before starting the motor.

Ensure no line is left in the head. Cut 2 lengths of 2.0 mm(Green) line by 3 metres each. With the head fully assembled, and arrows lined up on head, insert the line firmly into the hole on the side of the barrel and push it until you feel it grab. Pushing it a little more will force the line upward into a locking position in the drum. Rotate head and insert the second piece of pre cut line. Wind head anti clockwise and the line will wind itself onto the drum. Stop when the drum will rotate without cutting off any excess. Done!

It sounds like there is a faulty fuse. If you bought it new you can return it and ask for refund or replacement. Under new consumer laws retailers have to refund or replace, you do not need to accept repair. It is under a new law issued by the ACCC relating to consumer guarantees.