I think that is a vid on the how to install a repair coupling. This one is on a break line which might not be allowable in States that have inspections.

https://www.youtube.com/watch?v=CYOTd3ZjCQU

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84 300D, 82 Volvo 244Gl Diesel

or...
how about a piece of oil resistant rubber and some kind of clamping mechanism (maybe even just a good hose clamp)

cheap, fast, non-destructive temporary fix....

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1985 300TD 1981 Scirocco 1.6D conv 1986 Golf 1.6D 2003 Golf TDI

All right, got Betsie out on the asphalt again. Man, driving that old clunker makes me smile every time. Even waxed her too, so the parts that ain't rusty are shiny!

I got a miniature tube cutter and cut the bad part of the line out. Used some 3/8th transmission hose and double clamped each side with fuel injector clamps. I specifically got the transmission cooler hose (they had it at Napa) as fuel line is not rated for high temperatures.
The injector clamps are solid clamps with an actual screw, not the flimsy worm-screw kind.

I also got some sheet aluminum and cut out a kind of support bracket. I didn't like how much the unsupported line was shaking.

End result is not pretty:


But I just put 60 miles on her, and not a drop was lost! I used some of the same cooler hose and slit it length wise so I could fit it over the driver's side tube, right where the bracket is.

I wasn't able to put that metal spacer thing back in, because with that on I had issues getting the bracket to screw back in. Other than that, all went well.

Topped off the transmission and she is shifting as always (clunky) and drives fine. I'll go hunt for the actual replacement line, but.... I don't know, this seems to work quite well actually. Might just keep it like this for a while.

It still amazes me that all I have to do after her winter hibernation is turn the key. And she runs fine.

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"The MB W123 is so bulletproof, you can drive them forever. Which is a good thing as it takes that long to get anywhere."
Betsie: 1984 W123 300D (hobby, 280k miles)
Myrla: 2001 Mazda Protege 2.0 ES 5spd (daily driver, 130k miles)
The Turd: 2007 Toyota Camry (wife's car, 118k miles)

These cars are really incredible. If you have a clunky shift, you probably have vac problems. If clunky on the up shift, then you are not bleeding off the vac. If clunky on the downshift, you are not building up vac. If your shifts are just not crisp, you can adjust your transmission modulator a few clicks; there is a T key and I believe clockwise gives you a crisper shift.

But all that said, there is just no comparable vehicle to these guys. I am the original owner of a 1981 300SD; it is a daily driver and it runs just like the day I bought it.