A method for monitoring the availability of a device with hydromechanical or of an electronic control for the recovery of vapors in an open - loop - liquid distribution system, in particular for the introduction of fuel into the tank of a motor vehicle, wherein the means comprises:– a storage tank (1) for the fuel to be distributed,– a line for distributing liquid (2) with a filling column (3), the flow of the liquid between the storage tank (1) and a keg neck (10) makes it possible with a flow rate of the liquid ql,– a vapor recovery line (16) with a recovery pump (8), which makes it possible to the flow of the steam which, during the filling of the tank between the keg neck (10) and the storage tank (1) is produced, and in particular with a steam throughput qv,– The counter means, the with the liquid distribution line (2) are connected, and a liquid detector (4) which, with a pulse generator or an encoder (5) is connected, which means it is a computer (6), volume and price of the output propellant to determine the clearly on..
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