MBE 4000 – Section 5.1 Fuel

Section 5.1

Use only commercially available vehicle diesel fuel. Grades such as marine diesel fuel, heating oil, and others are not permissible.‪

Note: Do not use fuel additives. Using fuel additives could affect your warranty.

If using diesel fuel with a high sulphur content, exceeding 0.5 percent by weight, change the engine oil at shorter intervals.‪


Fuel added from drums or cans could be contaminated. This could lead to malfunctions in the fuel system. Always filter the fuel before adding it to the tank.‪

Section 5.1.1
Flow Improvers

The effectiveness of flow improvers is not guaranteed with all fuels. Comply with the product manufacturer's recommendations. Any authorized dealer can provide information on approved flow improvers.‪

Section 5.1.2


The addition of kerosene lowers the flash point of diesel fuel. To prevent fire and risk of injuries due to burning, do not smoke or use open flames around fuel mixed with kerosene. Comply with all appropriate safety regulations.‪

Keep the quantity added as low as possible, bearing in mind the outside temperature. The addition of five percent by volume of kerosene will improve the fuel's resistance to cold by about 1.8°F (1°C). Never add more than 50 percent kerosene to the fuel.‪

For safety reasons, add the kerosene to the diesel only in the fuel tank. Add the kerosene first, then the diesel. Run the engine for a short time to allow the mixture to reach all parts of the fuel system.‪

Section 5.1.3
Winter Grade Diesel Fuel for Cold Weather

At low outside temperatures, paraffin may separate from the diesel and affect its ability to flow freely.‪

Avoid breakdowns caused by this problem (for example, blocked filters) by using cold-resistant winter-grade diesel fuel with improved low-temperature flow characteristics. In most cases, winter-grade fuel can be used without problems at cold outside temperatures.‪

If using summer-grade fuel or a less cold-resistant winter grade, a flow improver or kerosene can be added. The amount needed depends on the outside temperature.‪


Do not add gasoline to diesel fuel or engine damage will result.‪

Flow improver or petroleum spirit must be mixed with diesel fuel before its flow characteristics have been adversely affected by paraffin separation. If changes have already been caused by paraffin separation, they can be corrected only by heating the entire fuel system. Do not add anything to cold-resistant winter-grade diesel fuels. The fuel's low-temperature flow characteristics could actually deteriorate with additives.‪

MBE 4000 Service Manual - 6SE412
Generated on 10-13-2008

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