Join Date: Sep 2009
Location: Door County, Wisconsin
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It is my understanding from research, that blends of biodiesel greater than 50% run in the common rail('03 and up)Cummins will begin to cause problems.
What happens, is the common rail high pressure system changes the molecular structure of the biofuel, making it "stringy" which will cause filter plugging. Not all of the pressurized fuel is injected, and a certain percentage is returned to the fuel tank. Over time, more and more of the "stringy' fuel concentrates in tank, which then begins to clog the fuel filter. The degree of how this happens may be dependant on what type of basestock is used for the biodiesel as well.
If you take a look at the progress of emission standards, fuel injection pressures have steadily increased to comply, not only in the Cummins engine, but all manufacturers. High concentrations of biofuels are probably more suitable for older diesel engines.
I, myself will not run more than B20, and only during the warmer months as not to have any gelling issues. And at this concentration, I don't experience any power or economy losses. Biodiesel has 7% less energy by volume than petroleum diesel.
'98.5 2500 Clubcab Short box 24v 4X4 5speed