General Information - I

Functional Description Of Fuel Supply System

General information
Fuel supply systems for spark-ignition engines

Fuel system
The electric fuel delivery pump in the fuel tank generates pressure in the fuel system. This pressure is set at a certain level by the pressure regulator.

Ventilation system
The ventilation system is a closed system which is vented via an activated carbon filter. The carbon in the activated carbon filter is stored in the form of a granulate. The large surface area of the carbon absorbs the fuel vapours which occur in the fuel tank. The activated carbon filter needs to be regenerated at regular intervals for it to be able to continue absorbing fuel vapours. Regeneration is performed by flushing out with fresh air through the intake manifold. This process is controlled by the engine control unit.