This European Standard specifies the following points regarding the minimum requirements for an overfill prevention system: ??functions; ??major components; ??characteristics; ??test methods. This European Standard is applicable to overfill prevention systems for liquid fuels having a flash point up to but not exceeding 100 ?? excluding liquefied petroleum gas (LPG). The requirements apply to overfill prevention systems suitable for use at ambient temperatures in the range from - 20 ??to + 50 ?? subjected to normal operational pressure variations.