The PEFC generator for automotive application is expected to have a low cost, a low weight and a low size, to compete with more and more efficient combustion engine. To reach this aim, the complete system has to be taken into account, not only the stack itself, but also the fluid circuit ancillaries. A model is developed with the aim in view to be integrated in the simulation of an electrical vehicle power train. As many components have to be modelled, a macroscopic approach has been chosen. A general scheme of the system is proposed, which structure is representative of an embedded generator, i.e. few sensors, few actuators. Gaseous hydrogen is stored in a tank. The anode output is closed by a solenoid valve. It is opened when the fuel cell voltage reaches a minimum threshold, allowing flushes of the channels. Air is provided by a compressor which flow is controlled by the motor speed. The modelling of the fuel cell electrical response is developed, based on semi-empirical approach. The decrease of the output voltage which can be attributed to the anodic dead end operation is taken into account. The fluidic behaviour of the gas circuits has been dealt through an electrical analogy to facilitate the implementation in a usual electrical engineering software (Matlab/Simulink®). Each component of volume V and fluidic resistance Rf is represented by a RC cell. In a formal approach, the flow is related to the current and the pressure is related to the voltage. The model is validated with experimentations carried out on a low power test bench (100W). Then, it is simulated on a load cycle, compatible with vehicle application dynamics.