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  #1  
Old 04-16-2007, 01:13 AM
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Fuel Line - Return lines from injectors + Main lines (Biodiesel)

I tried a few searches but couldn't find the exact info needed.

Can somebody tell me quickly what size fuel lines I've got on my 78 240D, and maybe how to source some Viton or other platicized line appropriate for biodiesel?

I've got a leak right now in the small injector return lines. This doesn't seem to be biodiesel related but rather the result of age because the line I pulled off cracked and was very hard, not swelling. I did cut off a section of the return line to take to an auto parts store and measure, but I don't have a measuring caliper to make things accurate and easy...

I do have noticeable swelling in the return line from the top of the fuel filter housing to the hard line running back to the tank, so I would like to do this all at once. The lines back between the tank and the hard lines look good.

Running up to B99.

All help appreciated.

Thanks,
B
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Old 04-16-2007, 01:22 AM
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Grease Works sells 100% viton hose kits specific for each model of MB as well as MB parts. http://www.greaseworks.org/store. As well as bulk viton and bulk viton lined hose.

The injector return lines are 1/8", and the rest of the fuel lines are 5/16".
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  #3  
Old 04-16-2007, 01:28 AM
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I'm told that as long as you use quality fuel line, ie. something sold here on Mercedesshop.com or another of the quality vendors, you'll have no problem with biodiesel. Many start running biodiesel with 5 year old hoses that are about gone anyway, then run the biodiesel, the hose fails, and they think the biodiesel caused it. This is what I'm told, I haven't run biodiesel personally.
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Old 04-16-2007, 12:15 PM
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This is true. As long as you use good quality fuel line you'll be fine for a godo while. A lot of people like to put on viton so they don't have to use worry about it.
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  #5  
Old 04-16-2007, 01:08 PM
Gene
 
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Location: Buffalo NY
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I replaced mine with stock type ( although the return lines are black cloth now) and defintely plan on biodiesel use.

Another issue is the o rings in the IP I read here. And I'm not sure if my "new" W124 95 is at risk as much as a 85 W123.
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Old 04-16-2007, 01:10 PM
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Quote:
Originally Posted by Biodiesel300TD View Post
The injector return lines are 1/8", and the rest of the fuel lines are 5/16".
oh, come now, the return lines are 2.5mm, and the main fuel lines are 8mm.
John
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  #7  
Old 04-16-2007, 02:08 PM
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Quote:
Originally Posted by Diescipel View Post

I do have noticeable swelling in the return line from the top of the fuel filter housing to the hard line running back to the tank, so I would like to do this all at once. The lines back between the tank and the hard lines look good.

Running up to B99.

All help appreciated.

Thanks,
B
Hmmm, you sure this isnt the "cigar hose" you are referring to? If so, it is supposed to be "swelled"(is that a word?(lol)). Shaped like a big ol stogie!.
Jim
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