Gas leak detector for detection of a leak of liquefied petroleum gas from - a first type of leak of gas from a gas container valve unit of a LPG gas container and/or - a second type of leak of gas between the gas container valve unit and the gas container and/or - a third type of leak of gas through a wall or a joint in the gas container, wherein the gas-leak detector comprises - a housing which can be moved to at least partly surround the gas container, the housing comprises means for providing a closed connection between the housing and an external surface to form a closed space, or a substantially closed space, so that the first and/or the second and/or the third type of leak of gas from the gas container and/or gas container valve unit leaks into the closed space, - detection means for detecting the first and/or the second and/or the third type of leak of gas, - an airflow generator for moving a mixture of air and any leak of gas to the detection means, wherein when the housing is in a closed connection with the external surface, then the closed space, the detection means and the airflow generator are part of a gas tight closed loop, or a substantially gas tight closed loop, so that the airflow generator circulates at least a fraction of the volume of the mixture of air and the leak of gas in the gas tight closed loop, wherein the gas tight closed loop comprises a circuit connected to the housing to enable the circulation of the mixture of air and the leak of gas via a fluidic passageway of the circuit, and wherein the housing further comprises a top part, a bottom part and a side part, and the side part is connecting the top part and the bottom part, wherein the bottom part of the housing is movable relatively to the top part of the housing. - a first type of leak of gas from a gas container valve unit of a LPG gas container and/or - a second type of leak of gas between the gas container valve unit and the gas container and/or - a third type of leak of gas through a wall or a joint in the gas container, - a housing which can be moved to at least partly surround the gas container, the housing comprises means for providing a closed connection between the housing and an external surface to form a closed space, or a substantially closed space, so that the first and/or the second and/or the third type of leak of gas from the gas container and/or gas container valve unit leaks into the closed space, - detection means for detecting the first and/or the second and/or the third type of leak of gas, - an airflow generator for moving a mixture of air and any leak of gas to the detection means, wherein when the housing is in a closed connection with the external surface, then the closed space, the detection means and the airflow generator are part of a gas tight closed loop, or a substantially gas tight closed loop, so that the airflow generator circulates at least a fraction of the volume of the mixture of air and the leak of gas in the gas tight closed loop, wherein the gas tight closed loop comprises a circuit connected to the housing to enable the circulation of the mixture of air and the leak of gas via a fluidic passageway of the circuit, and wherein the housing further comprises a top part, a bottom part and a side part, and the side part is connecting the top part and the bottom part, wherein the bottom part of the housing is movable relatively to the top part of the housing.