I have talked with several people over the last few months that have been asking the question " What is causing the diesel fuel to turn black".
The refining process used to produce Ultra Low Sulfur Diesel does not extract or refine out as much of the asphalt as in the past. In addition there is a lower demand for asphalt due to recycling practices. Both of these contribute to a higher concentration of asphaltenes present in our diesel fuel. The asphaltenes are not visible to the naked eye until the fuel has passed through the system and returned to the tank.
The high amount of pressure and heat the fuel is subjected to is actually refining out the aspahltenes as the fuel passes through the system. This is causing several problems, black tar like sludge in the fuel filters, plugged fuel lines, plugged return flow splitters, black staining inside fuel tanks. This is commonly mistaken for microbial growth a.k.a. diesel algae. A microbial test culture can be used to confirm or rule out the presence of microbial (algae) contamination.
One of the most talked about besides plugged fuel filters is, fuel tanks that are not staying equal. One tank will be completely full and sometimes overflowing and the tank on the other side will only be half full.
Asphaltenes are present in all ultra low sulfur and these problems can and will occur with any make diesel engine. The Cummins engines seem to be more prone to returning black fuel than some of the other makes. More times than not if someone is having one of the above mentioned problems they have a Cummins engine.
Primrose Power Klenz 5007 and Winter Klenz 5757 will safely dissolve the asphaltenes and turn it back into power as is it removed from the system. Continued use of Power Klenz 5007 and Winter Klenz 5757 will prevent the problems from reoccurring. In addition both products will significantly reduce regens, raise the centane by 40 points and improve lubricity by as much as 67%.
The Primrose Klenz series of products will also provide the thermal stability our fuels need to prevent the asphaltenes from coming out of the fuel and causing the above mentioned problems.
The picture above is asphaltenes in fuel that has been returned to the fuel tank.
If you have any questions or would like more information please don't hesitate to contact me. I also offer free fuel storage tank evaluations and on site consultations.
Jeff Stone
Independent Manufacturers Rep.
605-528-3382
Primrose Oil Company, Inc.
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