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Fuel Recommendations
Bio-Diesel Fuels
In Europe and in the United States, as well as some other countries, non-mineral oil based
fuel resources such as RME (Rapeseed Methyl Ester) and SOME (Soybean Methyl Ester),
collectively known as FAME (Fatty Acid Methyl Esters), are being used as extenders for
mineral oil derived diesel fuels.
YANMAR approves the use of bio-diesel fuels that do not exceed a blend of 5% (by volume)
of FAME with 95% (by volume) of approved mineral oil derived diesel fuel. Such bio-diesel
fuels are known in the marketplace as B5 diesel fuels.
These B5 diesel fuels must meet certain requirements:
1. The bio-fuels must meet the minimum specifications for the country in which they are
used.
• In Europe, bio-diesel fuels must comply with the European Standard EN14214.
• In the United States, bio-diesel fuels must comply with the American Standard ASTMD-6751.2.
2. Bio-fuels should be purchased only from recognized and authorized diesel fuel suppliers.
Precautions and concerns regarding the use of bio-fuels:
1. Free methanol in FAME may result in corrosion of aluminum and zinc FIE components.
2. Free water in FAME may result in plugging of fuel filters and increased bacterial growth.
3. High viscosity at low temperatures may result in fuel delivery problems, injection pump
seizures and poor injection nozzle spray atomization.
4. FAME may have adverse effects on some elastomers (seal materials) and may result in
fuel leakage and dilution of the engine lubricating oil.
5. Even bio-diesel fuels that comply with a suitable standard as delivered will require
additional care and attention to maintain the quality of the fuel in the equipment or other
fuel tanks. It is important to maintain a supply of clean, fresh fuel. Regular flushing of
the fuel system and/or fuel storage containers may be necessary.
6. The use of bio-diesel fuels that do not comply with the standards as agreed to by the
diesel engine manufacturers and the diesel fuel injection equipment manufacturers, or
bio-diesel fuels that have degraded as per the precautions and concerns above, may
affect the warranty coverage of your engine.