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  #1  
Old 04-02-2013, 12:43 PM
resto108's Avatar
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What % biodiesel?

I have my own fuel tank at the house, and my Co op offers soy diesel in 2-50%. I'm fairly new to diesels, so I was wondering about pros/cons of biodiesel. This is a 617 turbo daily driver.

Thanks for the input!
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  #2  
Old 04-02-2013, 12:54 PM
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I've heard that general consensus is that up to 20% Bio won't degrade buna rubber but higher than that, gaskets and hoses need to be changed to viton. You'll probably clog up a few fuel filters as well since bio does such a good job of cleaning things up. It makes my diesel smell so much better too.

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Old 04-02-2013, 01:09 PM
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On the flip side if you go higher than 20% you could just buy a role of viton and change the fuel lines as they start to leak. There really aren't that many rubber bits in the fuel system, relatively speaking.
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Old 04-02-2013, 01:10 PM
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Also not sure how cold it gets by you, but biodiesel does have a higher gelling point than diesel
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1997 E290 Turbo Diesel Wagon -traded for above, an amazingly comfortable car to drive, great drivetrain, but the rust, oh my god the rust
1992 BMW 525i -traded in
1990 Silver 300TE -Sold Loved the wagon, hated the M103
1985 Grey 380SE Diesel Conversion, 2.47 rear end, ABS -Sold, really should have kept this one
1979 Silver 300D "The Silver Slug" -Sold
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  #5  
Old 04-02-2013, 01:21 PM
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Quote:
Originally Posted by resto108 View Post
I have my own fuel tank at the house, and my Co op offers soy diesel in 2-50%. I'm fairly new to diesels, so I was wondering about pros/cons of biodiesel. This is a 617 turbo daily driver.

Thanks for the input!
They make anit-gel for Boidiesel

Fuel Injection Hose SAE J30R9 or 30R90 SAE 30R9 is lined with Viton and can be had at the local Auto Pats stor. The GoodYear Version is blue lined and I beleve the Gates Version is brown lined.

Some People are useing Weed Wacker Fuel Hose for the Return Line
The brand I used is Oregon, it is a Tygon fuel hose.
Tygothane (Saint Gobain is the Manufacturer)
U.S. Plastics is the retailer.
http://www.usplastic.com/catalog/default.aspx?catid=864&parentcatid=856&gclid=CPfkzZXthqgCFY1n5Qodyn524Q
More Notes: Authousaz has this info next to the Fuel Return Line: Fuel Hose/Line; 3.2mm ID x 1.9mm;
According to this site: Convert inches to mm - Conversion of Measurement Units
1/8"= 0.125"=3.175mm
So 1/8" ID Hose is actually a little tighter than the 3.5mm stock Hose.

You can try the 5/16" ID Fuel Injection Hose to replace the Fuel Return Hose (Cigar Hose) if it out that it wiggles around and creages noise you can get a New Cigar Hose. I have yet to read of anyone saying the Cigar Hose is real sensitive to Biodiesel. Perhaps because it is thick.
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  #6  
Old 04-02-2013, 03:13 PM
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Blends

My experience with B100 and B20 in a 1985 300D-T (W123, OM617) confirms what earlier posters have written. (1) Anything over B5 (some even suggest B2) improves the lubricity of the fuel, especially ULSD, which is about all we have in the states these days. Lubricity is good for the diesel injection pump. (2) Anything from B20 up eliminates the diesel "stink." (The "stinkiness" of diesel is obviously very personal.) (3) Fuel economy is slightly reduced with B100 (1-2 mpg); fuel economy with B20 is not noticeably different from D2; B50 fuel economy I do not know. (4) B100 is pretty solid at 32F. If your area gets that cold or colder, switch to a blend. B20 should be close to D2 in anti-gel properties, especially if the D2 portion of the blend is "winter diesel." There are also anti-gel liquids sold in small bottles for high prices at your local McParts store or truck stop. You can experiment by putting samples at various concentrations in your refrigerator or freezer. Remind your wife NOT to use it for cooking.

If the price of B100 were no more than D2, I would be tempted to try B50. Here on the west coast, B100 is more expensive than D2 because it is produced in the Midwest and shipped out here, adding to the cost. Consequently I've standardized on B20, available locally at the pump for $0.10 more than D2, for my two current diesels.

My '95 E300, new to us a year ago, now has 10K miles on B20 and still has un-disintegrated factory-type return hoses. On B100 in the OM617 I found factory hoses lasted about a year so I switched to Viton. A web site called "fryerpower" has a good selection of Viton hose and o-ring kits for Mercedes and other diesels.

Jeremy
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Old 04-02-2013, 03:24 PM
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Quote:
Originally Posted by resto108 View Post
I have my own fuel tank at the house, and my Co op offers soy diesel in 2-50%. I'm fairly new to diesels, so I was wondering about pros/cons of biodiesel. This is a 617 turbo daily driver.

Thanks for the input!
Anywhere in that range you should be fine. 5% is enough to get the lubricity benefits. In higher concentrations the advantages are that it's home grown, sustainable, and carbon neutral. And it changes the way the exhaust smells which can be a plus or a minus depending on your preference. Disadvantage: It usually costs a bit more.
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  #8  
Old 04-02-2013, 04:00 PM
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All we really have around here is ULSD, so I generally have half a dozen 1/2 empty bottles of assorted whatnot rolling around in the trunk of the 190 to add to increase cetane ratings, lower the gelling temp, and increase lubricity. When able to FIND Biodiesel, it is one of two- B5 and B20. The 190 loves both- but the stations that sell B5 generally have BIG signs announcing that they sell BIODOESEL! but they also ask around 50 cents or more a gallon for it compared to the ULSD. For that, it isn't worth the extra cost in my book. If I could find good B20 for 10 cents more a gallon around here- it would be all our diesels would drink.

Try and find a good supplier that moves the product though- I stopped at a coop out in the boonies of Indiana once and bought B20 and not only did I have to pay in cash, but the 190 ran like crap on it and cost me two fuel filters. I suspect it was really old...
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  #9  
Old 04-02-2013, 04:05 PM
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I run 100% biodiesel in temps over 40. I can hear the differnce in the volume of the idle.

I burned up four filters when I began making biodiesel and have done as others have suggested and "replaced" as they leak for fuel lines.

As for "old" biodiesel the math doesnt add up. I imgagine it cleaned a bunch of gunk out of your tank at the expense of the filters you mentioned and some performance....
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  #10  
Old 04-02-2013, 04:24 PM
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I work at a biodiesel plant and run 100% in my 84 TD and my 95 dodge cummins

After the 3rd tank. I canged both filters. I have been running B-100 for about a year now. The only problem so far I had is a return line pop off an enjector on the Merc but it was 27 years old. Replaced it with new but the same fabric coated lines. From what I have herd the fabric coated lines are bio friendly
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  #11  
Old 04-02-2013, 05:27 PM
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I run B99. Car runs more quietly. No smoke from exhaust except at first startup in cold weather. It's more expensive, but I don't mind. I like how it makes my car run. I don't drive that often or that far anyway. Haven't had to replace any of the 5/16" lines yet. My 1/8" ID return lines which were old already did almost immediately start weeping with the B99. I'm running the Tygon "weed-eater" lines now and love how they are working and the price.

B5 and B20 are also available around here for the exact same price as D2 if you find the right station.
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