Fuel vapor recovery system (Mondeo 4)

The fuel vapor recovery system prevents fuel vapors from escaping from the fuel system into the atmosphere, which have an adverse effect on the environment.

The system uses a carbon adsorber to absorb vapors. It is mounted on the rear suspension crossmember and connected by pipelines to the fuel tank and the electromagnetic purge valve.

The electromagnetic valve for purging the adsorber, which switches the operating modes of the system based on signals from the engine control unit, is located in the engine compartment.

Fuel vapors from the fuel tank are constantly removed through a pipeline and accumulate in an adsorber filled with activated carbon (adsorbent). When the engine is running, the adsorbent is periodically regenerated (restored) by purging the adsorber with fresh air from the atmosphere.

Air enters the system under the action of vacuum transmitted through the pipeline from the intake manifold to the adsorber cavity, when the purge valve installed in the pipeline opens. The electronic engine control unit regulates the intensity of the adsorber purge depending on the engine operating mode, sending a signal with a variable pulse frequency to the valve.

Fuel vapors from the adsorber enter the engine intake pipe through a pipeline and burn in the cylinders.

Malfunctions of the fuel vapor recovery system lead to unstable idle speed up to engine stalling, increased toxicity of exhaust gases and deterioration of the vehicle's driving performance.

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