How to deal with paranoia about fuel leaks

I have used those for oil lines to an oil cooler in a race car running 60-70 psi max, where the oil got plenty hot. With the right hose (I used some with a woven steel inner braid liner and a woven cloth outer covering braid), you had to practically beat them onto the hose ends. I pulled on them like crazy and could not budge the line on the fittings; I really think I could have gently towed the whole race car with them! I put some wider clamps on them, lightly torqued, to feel better, but I am sure you are right and that the clamps were un-necessary. I got all of it at the local NAPA store that sells a lot of part to some local truck maintenance companies. Fittings and hoses were all good stuff.