It is my experience that traditional Zippo lighters are, like many other single name items for prepping, actually a system. When used as a system they work fine. When treated as a totally independent item, not so well.
Zippos were never designed to, or expected to, be filled and then set aside for some future use. They were designed for daily use, refilled with fuel as needed, re-flinted as needed, and re-wicked as needed. Very seldom were there any problems with their use, when used this way.
That is not to say a Zippo cannot be stored and used in the future. Sure it can. But the fuel must bestored with it, but not in it. There are several methods to do this, the best on in my opinion being original Zippo fuel cans.
When the time comes, though the stored Zippo is not an immediate reaction item, once brought out, fueled, and then used regularly, with re-filling, re-flinting, and re-wicking done with stored items, it is an immediate use item.
Just my opinion.