Fuel is supplied by the fuel pump through the fuel filter to each injector under pressure set by the fuel pressure regulator.
The fuel pressure regulator provides a fuel pressure differential between the fuel and intake manifolds. Excess fuel is returned to the fuel tank through the return pipe.
On a hot engine, fuel pressure is increased to improve fuel flow, making it easier to restart the engine for stable idling.
The damper is designed to dampen weak fuel pressure pulsations that occur during the operation of the injectors.
Fuel is injected into the intake manifold in accordance with signals from the electronic control unit.