TECHNOLOGY FOCUS - INORGANIC CHEMISTRY - Preferred Composition: The treated fuel comprises less than 2 wt.% water, preferably 2-25 wt.% water. The untreated fuel consists of blend and the biodiesel constitutes at least 5 wt.%, preferably at least 20 wt.%, and most preferably at least 80 wt.% of the blend. The untreated fuel consists of biodiesel or petroleum distillate. The biodiesel or petroleum distillate comprises one or more fatty and/or naphthenic acid impurities. The alkanolamines are present in an amount equal to at least 0.8 mol equivalents relative to a total of the fatty and naphthenic acid impurities, preferably 0.01-2 wt.% relative to the untreated fuel. The biodiesel comprises from 0.01-5 wt.% of the fatty acid impurities, and 0.01-1 wt.% of the naphthenic acid impurities. The untreated fuel consists of blend. The petroleum distillate comprises No.2 fuel oil or jet fuel. Preferred Property: The corrosion of brass in the presence of the treated fuel produces less than 70 ppm of copper in the treated fuel. Preferred Method: The blending is performed at a temperature of 10-5OdegreesC. Water (2-25 wt.%), based on the total weight of the resulting mixture, is blended with one of the biodiesel, the petroleum distillates, the untreated fuel or the treated fuel. Preferred Definitions:    total number of carbon atoms in R groups=4-24, preferably 6-20.    EXAMPLE - Diesel fuel was exposed to pools of standing water (e.g. fuel tank, storage containers) and fatty acids and amines within fuel were extracted into the pools. Aqueous solution containing butyl amino ethanol of 0.2 M with octanoic acid of 0.2 M and pH adjusted to 8.5 by ortho phosphoric acid (H3PO4) and/or potassium hydroxide addition, was prepared. Brass panel washed with Alcanox (RTM: 10% liquid Nox), buffed dry with paper towel and immersed into the obtained solution in glass bottle. The cap of the bottle was tightly placed so that evaporation was not performed. The solution (5 g) was collected after 30 days and analyzed by inductively coupled plasma atomic emission spectroscopy. The content of copper, lead and zinc were 10 ppm, less than 0.02 ppm and 7 ppm respectively.