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  #1  
Old 07-28-2008, 09:03 PM
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Return lines fail in 8 months

Replaced the return lines when I got the 116 last December. Wife said she smelled oil today. Checked and lines between 5 and 4 and 4 and 3 are leaking. They certainly didn't last very long. I've replaced a lot of return lines since low sulphur diesel came out.
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1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
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  #2  
Old 07-28-2008, 09:06 PM
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wow.

what do the ends look like?
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  #3  
Old 07-28-2008, 09:09 PM
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Mine are about a year old and are starting to leak...
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  #4  
Old 07-28-2008, 09:14 PM
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Quote:
Originally Posted by jt20 View Post
wow.

what do the ends look like?
Jeezuz man, you're expecting a lot. They're still on there. I've only done the diagnostics and preliminary procrastination. I'll check the ends when I get around to replacing them.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #5  
Old 07-28-2008, 09:17 PM
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Viton is the only way to go.
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  #6  
Old 07-28-2008, 09:29 PM
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Have you pulled inj's or removed them for another reason since replacing them? If so, they dont seem to last as long and can be difficult to get sealed again in my expirience.
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  #7  
Old 07-28-2008, 09:30 PM
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Quote:
Originally Posted by kerry View Post
Jeezuz man, you're expecting a lot. They're still on there. I've only done the diagnostics and preliminary procrastination. I'll check the ends when I get around to replacing them.

soooo.. october sometime?
after the primary procastination has been successfully completed?

I expect a full report and DIY:

Braided rubber OEM style?, viton (never)?, where you bought it, manufacturer, where and how it was stored before you bought it, how you installed, running any additives?, where do you buy fuel?, how often and for how long does your fuel sit in your tank?, where do you park?, do you smoke in your car?

If the returns are leaking, what about the lines at the tank?

Should clamps be used to alleviate this?

My curiosity makes me a very difficult person to work with.

There is stronger fuel line available, right? That stuff with the blue plastic on the inside diameter and no braiding.? I used this on my tank when it started leaking-- pretty solid stuff. A terrible struggle to get on though.

maybe the injector nipples are shrinking? Think about all that heat. I mean how could fresh rubber fail so quick?

j/k
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  #8  
Old 07-28-2008, 10:08 PM
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Tell me more about the blue stuff.
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1977 300d 70k--sold 08
1985 300TD 185k+
1984 307d 126k--sold 8/03
1985 409d 65k--sold 06
1984 300SD 315k--daughter's car
1979 300SD 122k--sold 2/11
1999 Fuso FG Expedition Camper
1993 GMC Sierra 6.5 TD 4x4
1982 Bluebird Wanderlodge CAT 3208--Sold 2/13
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  #9  
Old 07-28-2008, 10:35 PM
ForcedInduction
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A previous owner probably cut them off with a razor or cutters and damaged the nipples. ULSD should not affect the braided fuel lines.
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  #10  
Old 07-28-2008, 10:53 PM
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I would suspect the quality of the hose. Unless the newer fuel is really taking a toll. The braided hose we used to puchase at volkswagon dealers seemed to last a very long time.

That to be fair was on earlier fuel though. Good hose tends to self vulcanize on to the nipples. Thats why it is hard to remove. Last place it should leak after being on there awhile. Possibly a new composition of material in use now. A lot of product has gone downhill perhaps on purpose as it does increase supplier business. Or just copycat junk on purpose or to meet a price point.
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  #11  
Old 07-28-2008, 10:54 PM
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Good quality dealer hose lasts a long time. I replaced mine like 3+ years ago and they are still soft and leak free.....same on my dad's SD.....
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  #12  
Old 07-28-2008, 11:26 PM
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Viton fuel return line

member JADAVIS is a supplier.
His website:
http://www.fryerpower.com/store/page11.html

3 ft of Viton fuel line with Free Shipping in the US!
$13.90
This kit is intended to replace the braided fuel lines on 5 cylinder Mercedes-Benz Diesel engines like the 617 variety. The posts on www.peachparts.com say that 2 feet is enough, but that does not include the line that runs from the last (first?) injector over to the fuel filter housing. I have included an extra foot to replace that line also. If in doubt, order the next larger size.

Free Shipping in the United States!

3 feet of High Temperature Viton Rubber Tubing, Hard, 1/8" Id, 1/4" Od, 1/16" Wall, Black.

He also offers combo packs at reasonable cost.
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  #13  
Old 07-29-2008, 12:30 AM
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all I gotta say is neon green trimmer fuel line... that stuff looks like crap in there on the beautiful MB motor, but it's been on there for two years, can be removed and re connected no issues, and seems to hold up quite well.... that and a 50' box cost 11.00....
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  #14  
Old 07-29-2008, 12:37 AM
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Napa

Quote:
Originally Posted by kerry View Post
Tell me more about the blue stuff.

napa had it. Althought the one near me didn't stock metric (of course). guy told me it was used on 'high pressure diesel' and 'big rigs'. I really don't know if he knew exactly what he was saying, but it was definitely intended for diesel. It was your typical rubber hose but the inside was blue and acted very much like a hard plastic (like a straw, or maybe that trimmer line that VSTECH mentioned). I believe it was a goodyear product.

I will look it up and post a pic.

I hope I am not refeerring to viton - I thought I knew the Diff.
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  #15  
Old 07-29-2008, 12:40 AM
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Very much like this:

http://www.goodyearep.com/ProductsDetail.aspx?id=5144

expensive and badass
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