With a decrease in outside temperature, the fluidity of diesel fuel decreases due to the crystallization of paraffin. For this reason, additives are mixed into the fuel that increase the fluidity to a temperature of -15°C and, accordingly, -22°C (Super-Diesel).
However, this is not always enough, so the fuel filter is heated. This is provided by the fuel returning from the fuel pump to the tank. This fuel heats up when compressed in the fuel pump. There is a valve in the fuel return line that changes the direction of heated fuel flow depending on the temperature of the filter. At temperatures up to +15°C, the filter is heated by heated fuel. If the fuel temperature rises above +31°C, the valve switches and the heated fuel returns directly to the fuel tank. The valve is mounted directly on the fuel filter.
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