Well it's hard plastic. Do you think you could take a new line and bend it without it snapping? I bought a new hard fuel line and it seems just as stiff as the old one it replaced.

Besides, it only snapped because I had twisted it and the loop of it had gotten stuck inside the dash. I just wasn't paying attention.

45psi is where the needle pegs. It probably goes to at least 80 when the car is at redline. Even so, that's pounds per square inch. The inside of the line has a tiny circumference. Like 0.37 inches. So each 1/8" of line has about 0.05 square inches of surface area. Therefore that 1/8 inch of line is only holding about 3.7 pounds of force spread along the entire circumference. Each tenth of the circumference only being 0.37 pounds of force. It's really not much.

I was pulling and tugging on the line with all the force I could - to try and get the end off the barbed connector. That plastic would not crack or rip at all. Yet it did snap when I bent it in the dash. Maybe because my garage was cold near 0 Celsius? Maybe a new line would be slightly softer and more forgiving. But I'm not scared of it just suddenly bursting. There isn't enough pressure inside that tiny line to cause that to happen. And the line experiences no forces on it while it's inside the dash.

I'm more worried about my axle boots! Now those are looking like they're on the edge of bursting open!