Butane lighter refill question?

Question

If a butane lighter doesn't have something to let you know the level of the fuel, how can you tell when the lighter is full while refilling it? I don't know if over filling can cause a problem or not so I want to know if there is a better way than just waiting for the gas to jet out the sides of the refill can.

Answer 1

I think the only way you know for sure if the lighter is full of butane is for it to spurt out when full and I don't believe it hurts anything for it to do that.