MWM MS 3.9L, Operation And Maintenance Manual, Page: 46 / 53

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NP 085.70.69 - 01/06
Fuel storage
Clean fuel, free of water, impurities and foreign materials are important factors to assure a good engine operation, for a long
time and without failures.
Water, dirt and sulfur contained in fuel are responsible for dregs formation in oil sump, deposits in compression rings
grooves, cylinders walls, injection nozzles and exhaust valves, besides impairing the good operation of fuel injection pump.
The usage of recommended lubricants contributes efficiently to neutralize, to avoid or to reduce the harmful effects of
these products during engine operation.
The function of the engine fuel filtering system is to avoid that dirt and impurities from fuel could damage fuel injection
system high precision parts.
Careless refueling overloads the engine fuel filtering system, compromising its main purpose.