I have a slow leak in the fuel return line on an 1850 and it is a high pressure rubber line( like a brake line at the front wheel of a car).
  My question is : Is that high pressure in that line? I am assuming not, but if it is not a high pressure line, why does it have a high pressure tube?
Replacing it is frustrating because the threads on one end are not the same as the other end, so it becomes a combination of steel brake line and high pressure rubber line. sure would be easier to use rubber gasline and hose clamps.
Any comments are welcome.
             Cal