i was thinking compression fitting too, but auto repair is not my main expertise. alot of time i go to ask for compression fitting for this stuff and the guy get that "deer in the headlights" look and says; you know this is a car,right? not household plumbing. the sizes are all wrong.pfft! compression fitting always works. get me a "sharkbite" dangit ill fix this.(JOKING...DONT DO THAT)
I had to buy a 18" piece of steel line that has the special end with an O ring that fits into the fuel filter has I was not able to form the special end. The other end of the line had no flare; it came with compression fitting to connect to the long steel line. So compression fitting are used on cars. I did double flare it thou, because I can.