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The fuel system is responsible for supplying fuel to the engine so that it can be burned along with the incoming air charge. The fuel pump is located inside the fuel tank, with a fuel strainer normally connected to the inlet of the fuel pump, to filter out any debris found in the tank.
Fuel is pressurised by the fuel pump and sent through the fuel filter, which removes fine particles found in the fuel so as not to damage the fuel injectors. The fuel injectors are attached to the fuel rail, which usually also includes a pressure regulator.
The fuel injector sprays a measured amount of pressurised fuel into the intake manifold. A valve in the pressure regulator allows excess fuel to return to the fuel tank via the return line.
A slight variation on this system is to place the fuel pressure regulator in the tank as part of the pump assembly, making the fuel return line unnecessary.