Fuel systems in Cummins engines deliver precise amounts of diesel under high pressure. Lift pumps draw fuel from the tank and feed it to the injection system. Filters remove particulates and water to protect components. High-pressure pumps pressurize fuel for efficient atomization. Injectors deliver controlled bursts into each combustion chamber. Rails and lines manage flow and maintain system pressure. Sensors monitor fuel temperature, pressure, and flow rate. Cummins designs these components for durability, precision, and emissions compliance.