Vehicle with gaseous fuel and automatic purge system

Is provided with storage belt pressure flow body oil tank (2) vehicle (1); the oil tank at least one exhaust channel (3 and 33); the exhaust channel is provided at least outlet (34); the exhaust channel is at least safety valve and oil tank is connected, is characterised: aThe safety valve is a heat decompression valve (5), a normal circumstances is at the be, and an open when the temperature increment automatic; the safety valve is arranged on the vehicle in the presumptive area, and outlet is far away to the presumptive area.