The purpose of a "fuel return" line in a diesel fuel injection system is to return excess fuel from the fuel injectors and/or the fuel injection pump back to the fuel tank. Diesel fuel injection systems typically supply more fuel to the injectors than is actually needed for combustion. This excess fuel serves several important functions. First, it cools and lubricates the fuel injectors. The high-pressure fuel flowing through the injectors helps to dissipate heat generated by the injector's internal compo....
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