More good news: I think the first injector line is not leaking now ... I noticed the torque wrench had slipped down to 10 ft-lbs so (hopefully) it was just loose. I also replaced the other line and it's only weeping a little bit now, so maybe if I find another replacement line for that, I'll be good to go!
I'm calling it a night and celebrating just a little bit with something from Starbucks.

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1987 300D, arctic white/palomino--314,000 miles
1978 240D 4-speed, Euro Delivery, light ivory/bamboo--370,000 miles
2005 Jeep Liberty CRD Limited, light khaki/slate--140,000 miles
2018 Chevy Cruze diesel, 6-speed manual, satin steel metallic/kalahari--19,000 miles
1982 Peugeot 505 diesel, 4-speed manual, blue/blue, 130,000 miles
1995 S320, black/parchment--34,000 miles (Dad's car)

It's not easy to use a torque wrench on the line nuts. I tighten them (by feel) just enough so they do not leak. Take the line off and look under a magnifier at the flared ends. If you see a groove there that is what's making it leak. You may be able to fix it by polishing that groove away with 400 grit wet/dry paper in a twisting motion.

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85 300D turbo pristine w 157k when purchased 167,870 July 2025
83 300 D turbo 297K runs great. SOLD!
83 240D 4 spd manual- parted out then junked