Additional Technical FuelRequirements• The fuel cetane number should be 45 orhigher.• The sulfur content must not exceed 0.5%by volume. Less than 0.05% is preferred.• NEVER mix kerosene, used engine oil orresidual fuels with the diesel fuel.• Water and sediment in the fuel should notexceed 0.05% by volume.• Keep the fuel tank and fuel-handlingequipment clean at all times.• Ash content should not exceed 0.01% byvolume.• Carbon residue content should notexceed 0.35% by volume. Less than 0.1%is preferred.• Total aromatics content should notexceed 35% by volume. Less than 30% ispreferred.• PAH (polycyclic aromatic hydrocarbons)content should be below 10% by volume.• NEVER use Biocide.• NEVER use kerosene or residual fuels.Handling of Diesel Fuel! DANGEROnly fill the fuel tank with diesel fuel. Fillingthe fuel tank with gasoline may result in a fireand will damage the engine. NEVER refuelwith the engine running. Wipe up all spillsimmediately. Keep sparks, open flames orany other form of ignition (match, cigarette,static electric source) well away whenrefueling.ALWAYS store any containers containingfuel in a well-ventilated area, away from anycombustibles or sources of ignition.ALWAYS put the diesel fuel container on theground when transferring the diesel fuelfrom the pump to the container. Hold thehose nozzle firmly against the side of thecontainer while filling it. This prevents staticelectricity buildup which could cause sparksand ignite fuel vapors.BEFORE YOU OPERATE22 YM Series Operation Manual© 2007 Yanmar Marine International