Does your T1N fuel door flop open and closed? Then you are probably missing this spring! It’s specially designed with the door to hold the door closed when it’s supposed to and also keep it open while refueling.
If your door is in good shape and you are missing the spring, it’s pretty easy to replace. No special tool needed to get that factory fresh performance once again.
Genuine MB
Brand new T1N fuel doors (with spring) available here.