Wow, 2300 PSI! Lots of pressure, but not much volume - which I suppose is why they appear to just dribble a little fuel out.

With that much pressure, if there were a pin hole in the line, I guess it would be obvious - i.e. some fuel coming out of the suspect area.

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1986 300 SDL, gray on black, #14 head, 180K miles
1982 300 CD, silver on palomino, 290K+ miles [sold]
1980 300 SD, white on palomino, 500K+ miles when retired [uncle's car - inspiration for the above]