Abstract: The present invention relates generally to a fluid level control system comprising a level sensor (10), and a valve in the form of a shut-off valve (12). The level sensor (10) is mounted to a vessel (not shown) and designed to sense the level of fluid, such as fuel, in the vessel. The shut-off valve (12) is designed to be actuated by a dry-break refuelling nozzle (not illustrated). The shut-off valve (12) is operatively coupled to the level sensor (10) via a sampling flow line (14) together with first and second hydraulic return lines (16) and (18), respectively. The shut-off valve (12) is of a normally-open configuration wherein it permits the flow of fuel from the refuelling nozzle to the vessel whilst the fluid or fuel level is below a predetermined level. The level sensor (10) is configured to effect closure of the shut-off valve (12) when the fuel level is at the predetermined level.