Certainly, it could be a bad O-ring, but it could also be a steel line, a rubber line, or even a nylon line.
Can you take a pic and upload it for me to see where it's leaking from? That would be helpful.
Also, I attached a pic below showing the fuel lines, fuel rail, and pressure regulator. I highlighted areas where connections are made. Check around those areas as well.
Let me know.
Friday, April 29th, 2022 AT 9:39 PM