Sounds like a good idea at first glance, but it doesn't work that well. When installed at the filler neck, it flows like crazy. It needs a neck with a lip to hold it in place, most cars now have a plastic insert that sits flush with the steel tube. This makes it partially unusable. Instead, I use old gas caps - take the cap off and pull out the little valve in the middle. Then insert a piece of tubing that fits the narrow side. Inject smoke into the hose.
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