Fuel supply diagram in the fuel system of a diesel engine
From the tank (7), fuel is fed through the pipeline (8) to the fuel filter (1). The purified fuel is sucked in by the high-pressure fuel pump (2). Through the injection pipeline (6), the fuel is fed under pressure to the injectors (5). A small amount of fuel that passes by the injectors and is not injected into the cylinders, enters the fuel tank through the return pipeline (3 and 4).
The system is designed to clean and supply atomized fuel to the engine cylinders in the amount required for the corresponding operating mode.
The fuel system includes a rear-mounted fuel tank, fuel filter, high-pressure fuel pump, injectors, high-pressure and low-pressure fuel lines.
The suction line comes out of the fuel tank, runs along the floor of the car to the fuel filter in the engine compartment. The fuel entering the filter is cleaned and then sucked in by the fuel pump. Under pressure of 120-130 bar, the fuel is supplied by the distribution pump through the pipelines to the injectors. In this case, the fuel supply exceeds the need of the injectors. Excess fuel is returned through the return pipeline to the fuel tank. The fuel flow is also used to lubricate the moving parts of the fuel pump and injectors.