I'm still a bit confused how that s suppose to stay there over the years, makes me a bit worried wedging metal in metal with no permanent install where vibrations can occur metal on metal inside the gas tank area.
I helped a guy in Michigan put one in his 65 cuda. it's been in there for over 3 years now without a problem. the bottom teeth make grooves into the tube and hold it in there pretty well. oh and it stopped the kickback overflow problem he was having. he got a new cap and it hasn't stained his quarter panel since or leaked.
the hardest problem with installing it is the flapper wants to rotate (top or bottom of the flapper) or point towards the gas tank. but won't go past the curve in the tube,. it took a few tries to get it to stay upright. But once you get straight it wedges in and the teeth hold it firmly after you tap the bottom pointy teeth to grab a little more. I got the first one in and realized that the flapper was upside down. that took even longer to get it unhooked from the tube and pulled out . 15 minutes getting it in, 2 minutes trying to figure out why it looked funny (it was upside down) and 60 minutes trying to get it back out without breaking it. so far I've done 3 of em and they all were a pita to get lined up and in but once they are in they hold!
I'm going to do the other dart next year when it goes down for resto and I'll tack that one in (if I can get the tip in to do it) . I want to see if it makes a big difference. yeah the tube will be out of the car and away from the gas, since they are so easy to remove.
