Fuel quick connects come in 2 sizes that I have seen - 5/16" and 3/8". I re-used steel braided flex lines from the junkyard from Magnum engines (a truck and Cherokee, had both sizes). I had to cut one end and attach hose to the smooth tubing. You can get male and female sections in both sizes at Autozone and NAPA. They are intended for connecting to nylon hose, which I understand you heat-shrink on without clamps. Plastic tubing concerns me, though most current vehicles use it, so I used fuel injection rubber hose w/ fuel injection clamps instead. Most new quick-connects have plastic releases built-in. If not, you need a release tool, which are fairly cheap. I have seen a tool to swage your own male ends, but costs a lot (~$300?).