Emulsifier package with a short-chained and optionally with a long-chained surfactant for fuel emulsion

A method for powering a diesel engine with a fuel emulsion, the method comprising:

• preparing the fuel emulsion by emulsifying a fuel and water in the presence of an emulsifier package which comprises a short-chained surfactant of the formula (I)
• Ra—O-(AOa)m—Ra′ (I),
• in which
• Ra is a branched C8-14 alkyl,
• AOa is an ethylene oxide radical, propylene oxide radical, butylene oxide radical, pentylene oxide radical, or mixture thereof,
• m is a number from 1 to 100, and
• Ra′ is hydrogen or C1-4 alkyl;
• and
• wherein the emulsifier package additionally comprises a long-chained surfactant of the formula (II)
• Rb—O-(AOb)n-Rb′ (II),
• in which
• Rb is a linear or branched C16-32 alkyl,
• AOb is an ethylene oxide radical, propylene oxide radical, butylene oxide radical, pentylene oxide radical, or mixture thereof,
• n is a number from 1 to 100, and
• Rb′ is hydrogen or C1-4 alkyl.