How should biodiesel and diesel fuel be blended?
Most biodiesel and diesel fuel are “splash-blended.” This means they are simply pumped into the same tank and then it is assumed that the action of the fuels entering the tank or the motion of the transport truck provide enough agitation to mix them together. In most cases this is a good assumption. When making blends such as B20, if the mixing is not perfect, there is generally no harm since the engine will run fine on a higher or lower blend. When using a small amount of biodiesel, such as 2%, as a lubricity additive, then good mixing is important to be sure the additive is providing protection for each gallon of fuel used. In this case, more active agitation is warranted or the biodiesel can be injected directly into the diesel fuel stream as it fills the tank. Problems have been noted when biodiesel has been mixed with very cold diesel fuel. When the diesel fuel temperature is below the gel point of the biodiesel, the biodiesel may solidify before it has a chance to mix with the di
