ASTM International develops standards for fuels that ensure their quality, safety, and proper function in engines, covering specifications for gasoline, diesel, jet fuel, and ethanol, as well as test methods for properties like distillation, vapor pressure, and sulfur content. Key standards include D4814 for gasoline, D975 for diesel, D1655 for conventional jet fuel, and D7566 for sustainable aviation fuels, alongside numerous test methods like D86 for distillation and D5453 for sulfur content. These globally recognized standards are crucial for manufacturers, refiners, and regulatory bodies.