| abstract |
Deposits in a direct injection gasoline engine are reduced by providing as fuel for the operation of said direct injection engine a fuel composition comprising the fuel-soluble reaction products obtained by reacting (i) a monocarboxylic acid of the formula: n n n wherein R 1 is a saturated or unsaturated, linear or branched, C 8-18 hydrocarbyl group; and (ii) an amine of the formula NH 2 —CH 2 —CH 2 —NH—R 2 , wherein R 2 comprises (C x H 2x Z) y H, wherein x=2 or 3, y=0-4 and Z=NH or O. |