A method and a system for disconnection of a fuel supply

A system for disconnection of a fuel supply line (5) to a consumer, particularly a gas driven combustion engine (M) in a vehicle, comprises a fuel pressure tank (T) connected to the engine (M) by a pipe rupture valve (1) influenced by the pressure in a pilot line (4). A dumping cylinder (9) is charged by an automatically operated valve (11) from the pilot line (4) when the engine is stopped or its speed drops below a predetermined minimum value.