Biodiesel in a 6.7L

[AHarris]

Is the 6. 7 now cleared for 20% biodiesel (B20) or is it still only 5% (B5)?



Why can't a 6. 7 be run from the 100% biodiesel that you can make with the kits that are on the market? Biodiesel doesn't have any sulfur, so what's the issue?

 

[JFaughn]

Not sure about the 6. 7 , but the common rail high pressure fuel system is where the problem comes in , the high pressure causes the bio to polymerize [ turns stringy ] & plugs up the system , this is what I have read , seems to me that the manufactures are trying to build the trucks in such a way as to keep us from using the alt. fuels .

 

[DLGonzo]

What about the CDI's in the Liberty? Don't they have a common rail High pressure system? They run fine on Biodiesel up to B99

 

[sag2]

If you are running a Liberty diesel on B99 and it is still running you are extremely lucky. I have seen about 6 that required the complete fuel system to be replaced. The owners manual only allows B5.

 

[Cattletrkr]

Dad's '03 has run many gallons of B100 with no issues. He didn't run any this past summer because it was too expensive the fuel guy never even ordered any. My '04. 5 ran thousands of gallons of bio in concentrations as high as 80%. Fuel system was factory and running fine when I got rid of it at 210K. I wouldn't worry about these new truck because they're common rails. I'd worry more about what it would do to the exhaust filters. I have no clue what it would do to them but I can't imagine it would be good. Isn't Nox higher with bio? Not an issue for the C+C 'cause of no nox filter, but the p/u's could have probs.

Of course there are "fixes" for that too...

 

[archer2500]

NOX and particulate matter are actually lower with bio diesel and therefore a little easier on the particulate filter and cleaner to run. The downside is that most bio fuels have less enthalpy per volume than traditional petrol fuels. Translation, a little less power and a little less mpg/gallon than you get from #1 or #2 diesel.