Service records should be kept in a visible, handy place so they can be conveniently referred to when necessary and also constantly remind the machine operators to keep them up to date. C. Fuel filter maintenance 1. Air in the fuel lines of a diesel engine can cause the engine to run rough or not start. Water and dirt are the major enemies of a fuel system, especially in diesel engines. Water cause parts to rust, and even a very small amount of rust can damage injectors.
Water interferes with the proper metering of fuel, thereby causing the engine to run rough.
Dirt and sediment clog fuel lines and grind away the injection pump's fine fitted parts. Refer to the operator's manual of the equipment for the recommended fuel filter service interval. D. Importance of cleaning air filters 1. Air cleaners properly serviced remove abrasive materials from the intake air without reducing the huge volume of air required for adequate fuel combustion. The air-fuel ratio of a gasoline engine varies greatly.