Gas distribution system for feeding to an engine powered by alternative gas fuel (CNG, LNG), gas contained in a first gas tank (3) and at least in a second gas tank (4) and having a first gas conduit (12) connecting an output (3a) of the first gas tank (4)and a second gas conduit (14) connecting an output (4a) of the second gas tank (4). Valve device (7,8) are provided on the conduits (12,14) to select the gas (3,4) tank having the highest gas pressure and suppling to the engine (2) the gas provided by the selected tank.
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