Fuel composition

A fuel composition comprising a major amount of base fuel and a minor amount of two additives comprising (1) a polyhydric alcohol ester of a succinic acid derivative having as substituent on at least one of its .alpha.-carbon atoms an unsubstituted or substituted aliphatic hydrocarbon group having from 20 to 500 carbon atoms or a succinic acid derivative having on one of its .alpha.-carbon atoms an unsubstituted or substituted aliphatic hydrocarbon group having from 20 to 500 carbon atoms connected to a second .alpha.-carbon atoms of said succinic acid derivative by means of a hydrocarbon moiety having from 1 to 6 carbon atoms forming a ring structure, and (2) a minor amount of an additive comprising an aliphatic polyamine having alkylene radicals connecting amino nitrogen atoms and containing at least one hydrocarbon chain having an average molecular weight in the range from 500 to 10,000 attached to a nitrogen and/or carbon atom of said alkylene radicals connecting the amino atoms of the aliphatic polyamine.