Filling the tank to the mouth can detonate with an important part of the car

In the budget for the revision of my car at the dealership, the canister change appeared. But, after all, what is it?

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It is a device that receives and eliminates the vapors that come from the fuel tank to prevent these gases from accumulating in the atmosphere, the environment and our lungs. But it is damaged when, instead of the vapor of the fuel, it receives it in a liquid state.

This often happens when the gas station attendant fills the tank to the mouth. Often there is a request from the driver himself who forgets to explain to the gas station attendant that it is to fill up until it is complete, but only until the automatic pump is disarmed.