Metal chelating additives at 1% w/w do not prevent gum precipitation and/or viscosity increases in coal-derived distillate fuels stored in air at 50°C. However, distillates containing 10-15% w/w of added cyclohexanol, dipropylamine, ethylmethylketone or iso-propanol do not precipitate gum or increase in viscosity under simulated storage conditions. Data for cyclohexanol/fuel mixtures suggest that gum formation is inhibited by hydrogen-bonding between cyclohexanol and fuel constituents.