Replacing 'Permanent' Fuel Lines - Mercedes-Benz Forum
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post #1 of 81 (permalink) Old 05-11-2015, 01:01 PM Thread Starter
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Replacing 'Permanent' Fuel Lines

I noticed a blister the other day on one of my fuel lines. See pic. After seeing pics on this forum of folks who have lost their beautiful cars to fire, I was VERY motivated to get this fixed.

I was reluctant to modify a design that MB engineers came up but did. I cut off the 'pressed-on' or heat shrunk on or how ever they were installed, hoses, and installed standard fuel line and clamps. It was interesting to discover that I could rotate the factory hose against the metal, but it was not leaking.

Next time I get the car on a rack, I'll investigate just how hard it would be to replace the line with the proper MB part. The factory tubing has a hard plastic liner which has been mentioned here before. I hope you can see it in one of my pics. Replacing this with standard fuel line, even though it has working and burst pressures of 150+psi and 400+psi, respectively, makes me a little nervous. That flimsy and flexible line waving around in the engine bay makes me a little uncomfortable.

If you do this, be super careful not to score the barb as you're cutting off the old line. I started by making a cut along the axis of the hose but quickly realized I could not adequately determine the depth of my cut. So I changed to shaving off layers until I could see the barb start to appear. You don't have to completely expose it before the hose will pull off.

This is not a difficult project and the pics should speak for themselves. I read in another post that the hard lines do not come pre-bent from MB. I don't know if the lines spoken of are the ones I was working on but if they are, this fix may make a little more sense.
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Last edited by luckymike; 05-11-2015 at 01:04 PM.
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post #2 of 81 (permalink) Old 05-11-2015, 01:02 PM Thread Starter
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After pics.
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post #3 of 81 (permalink) Old 05-11-2015, 01:23 PM
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Don't forget to put some kind of sleeve over that hose to protect it from the exhaust manifold heat.


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post #4 of 81 (permalink) Old 05-11-2015, 01:28 PM Thread Starter
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Doc, why do you suggest that? The other lines have no sleeve. Is it because of the different style of hose?
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post #5 of 81 (permalink) Old 05-11-2015, 01:29 PM
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I sincerely hope you used fuel injection rubber hose, if not, you really need to replace the new line. Hose should be marked For Fuel Injection on the hose, or words to that effect.
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post #6 of 81 (permalink) Old 05-11-2015, 01:35 PM Thread Starter
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Originally Posted by Chadahar View Post
I sincerely hope you used fuel injection rubber hose, if not, you really need to replace the new line. Hose should be marked For Fuel Injection on the hose, or words to that effect.
Chadahar, it is fuel hose but I don't know if it's fuel injection hose. It's what the local distributor sells to all the local independent shops and I know that its pressure rating is way over what the system requires. I'll dig a little deeper.

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post #7 of 81 (permalink) Old 05-11-2015, 01:44 PM
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Quote:
Originally Posted by luckymike View Post
Doc, why do you suggest that? The other lines have no sleeve. Is it because of the different style of hose?
It will last longer and keep fuel cooler. The original hoses there are pretty thick most after market hoses are thinner than that one. Some of them came with a protective sleeve.


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post #8 of 81 (permalink) Old 05-11-2015, 01:55 PM
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Working Pressure: 145 psi or 10 bar
Bursting Pressure: 435 psi or 30 bar
Temperature Range: -22F to 194F
COHLINE # 2134 0800
Approved for gasoline, diesel fuel, water, air, and heating oil.


http://www.cohline-uk.org/AFHC_2013_Teil_2.pdf
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post #9 of 81 (permalink) Old 05-11-2015, 02:00 PM
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COHLINE 2134 OIL/PETROL FUEL HOSE - 7.5mm bore x 13.5mm od

Working Pressure 10 bar
Smallest bending radius 30mm
Maximum coil length supplied - 20 metres
This Superior Hose is designed to meet
COHLINE 2134 - DIN 73379 - 2A (edition 11/97)
Construction: Fuel Hose with middle permeation
inside NBR, textile braiding inside,
outside CR (abrasion resistant outer rubber layer)
Application and Temperature Range:
Commercial fuels, especially super grade fuels up to a max 50 % Benzol -22deg F up to +122deg F
Water, air, heating oil............................................... ....................... -22deg F up to +194deg F
Diesel fuels (gasoil) with RME - addition........................................ -22deg F up to +149deg F
short-term up to 230deg F



Moulded Oil Hose - Parquip Hose & Hydraulics Web Shop
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post #10 of 81 (permalink) Old 05-11-2015, 02:04 PM Thread Starter
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Originally Posted by 1mbzdoc View Post
It will last longer and keep fuel cooler. The original hoses there are pretty thick most after market hoses are thinner than that one. Some of them came with a protective sleeve.
I see. I also like the fact that a spraying leak would dribble out the ends, rather than atomize all over the engine bay. Learned that trick on my D-jet car.

Thank you.
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