I got the Viton lines like folks have used on here. Pretty consistently all my injectors are damp. The lines weep at the barb.

Do these lines need mini zip ties or hose clamps to hold?

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

Looks like tygon. Works pretty well but does get stiff after a little while. from my experience it Continues to work as long as its undisturbed. 1/8” ID ? How long have you been running it?
I got 5119k41 from McMaster. 1/8 Id, high temp viton tubing for chemicals. Been working great for a while now. Still supple enough to pull off the barb and push back on with out trimming.

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Current fleet
2006 E320 CDI
1992 300D - 5speed manual swapped

former members
1984 300D "Blues Mobile"

1978 300CD "El Toro"

Yeah you’re right, I looked at the receipt and it’s tygon, fwiw.

Installed in August. Have wept slightly, on and off, since day one. They are soft and flexible.

They just seep a bit at the nipples. Sometimes the injectors look dry, most of the time
They’re at least a little damp at the top.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

I was really sold on this stuff for years. Somebody recently pointed out one of my lines was weeping at a GTG this summer. I used a metric size from China. It fits pretty tight but one of my injectors weeps a bit on hot days. Tygon.

__________________
79 300TD “Old Smokey” AKA “The Mistake” (SOLD)
82 240D stick shift 335k miles (SOLD)
82 300SD 300k miles
85 300D Turbodiesel 170k miles
97 C280 147k miles

I believe people have said the real Mercedes line was updated. That may be so for the similar line sold by the VW dealer.

You can actually leak off enough fuel that would have covered the cost of new lines.

The other issue is if the nipples got nicked while removing the old lines.

I don't know what size they are but there is some diesel SUV that used tiny spring clips on the return lines.

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84 300D, 82 Volvo 244Gl Diesel

I never have had issue with the Mercedes line. Just thought I’d try this stuff on a whim.

If one was weeping I’d agree that maybe a nipple was busted. Since all of them do it at various points I think it’s the line.

The tiny spring clips might be the answer. I have plenty of original MB line as well since I have a lot of these cars.

__________________
Current Diesels:
1981 240D (73K)
1982 300CD (169k)
1985 190D (169k)
1991 350SD (116k)
1991 350SD (206k)
1991 300D (228k)
2008 ML320 CDI (199k)
1996 Dodge Ram CTD (442k)
1996 Dodge Ram CTD (267k)

Past Diesels:
1983 300D (228K), 1985 300D (233K), 1993 300D 2.5T (338k), 1993 300SD (291k)

No leaks from the 1/8" Viton hose I put on both my 2 300D maybe 6 years ago. Bought on ebay from China, so must be real Viton. Dark brown.

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1984 & 1985 CA 300D's
1964 & 65 Mopar's - Valiant, Dart, Newport
1996 & 2002 Chrysler minivans

Spring clips are good … but if you look at the picture there is no room for them to fit low enough down to clamp.
I purchased some viton to put on my om606 years ago but the injector barb did not have enough clearance between barb and body for it to physically fit.. viton always has a slightly thicker wall than rubber leak off hose.