Is that what all the teens you see with their hand on their crotch are doing, pulling on their clunk to see if it will fall off?

I always change the supplied fuel tubing that comes with most tanks to go from the clunk to the tank plug. It's thinner stuff, and usually tears, even if the clunk stays on. I use regular fuel tubing, and also use a small plastic zip-tie to hold it in place. Haven't had my clunk fall off yet.