I forgot to suggest the most likely cause of sealing difficulties with fuel lines. Ma Mopar required a quality product that could be R&R'd many times over the life of the car.

Is there anyone that assumes that offshore manufacturers give any consideration to this critical requirement when designing or building their third rate products!

I've used for the last several plus decades, the HS/DC/Mopar Performance, Right Stuff, Fine Lines, In-Line tube Steel and Stainless six pack lines, I use Stainless fuel/brake/emission/etc lines almost exclusively in my customers and personal builds....ZERO LEAKS, ZERO ISSUES, most problems can be traced to, and are usually operator/installation ignorance and or error