Method and valve for the venting of a saddle fuel tank

A system for venting a tank, said system comprising a tank with a valve, a primary compartment and a secondary compartment connected together in a communicating manner by a bridge, wherein the valve comprises:

• a) a chamber provided with a cover, which extends at least partly into the tank and is connected via an upper venting aperture to a venting circuit;
• b) first means for monitoring a level of liquid in the primary compartment;
• c) second means for monitoring a level of liquid in the secondary compartment;
• the valve being configured to be closed when:
• said first means detect that the level of liquid in the primary compartment is equal to or higher than a first predetermined filling level;
• and
• said second means detect that the level of liquid in the secondary compartment is equal to or higher than a second predetermined filling level.