Reading some other threads it seems you can just cut the metal tube and the rubber hose and put a hose clamp on it. I don't have to flare the pipe or anything? And this works for the high pressure line too? Just don't want to have the line pop off. Would prefer a slow leak...

 

No need to flare, and that high pressure is not very high pressure at all. No worries.

A couple of worm clamps, and the rest of the line will fail before that joint gives you any trouble.

 

or use compression fittings

 

Suggest you replace the bad line with a new Dorman line. Get it at any auto parts store.