54 Fuel System Fuel Filters Note: When draining the fuel filters, collect the waste in a fuel-proof container. Always dispose of coolant according to Federal or local regulations. Take the drained fuel and water to a recycle or waste management center. For the Volvo engine, change the fuel filters at every other oil change when running the 15,000 mile (24,000 km) oil drain interval. Change the fuel filters every oil change when running the 25,000 mile (40,000 km) oil drain interval. Drain the primary filter water trap daily. W2003931 For other engines, the engine manufacturers recommend changing the fuel filter at every oil change.
For bleeding the fuel system, see “Bleeding the Fuel System” page 105. For Cummins engines see manufacturer’s information manual included in your introductory package. Fuel Sulfur Content Fuel sold after 1994 for highway use can only contain a maximum sulfur content of 0.05% by weight. This was done to reduce particle emissions in the exhaust. The sulfur content for off-highway use continues to be specified at a maximum of 0.5% by weight. The use of a fuel containing 0.5% or higher level of sulfur, necessitates more frequent engine oil changes because of sulfur deposits and higher corrosion risk. If using fuels with high sulfur content, the oil change intervals must be cut in half.
See “Sulfur Level and TBN” page 66 for more information. Note: The use of low sulfur diesel oil fuel does not permit extension of engine oil change intervals or oil filter changes.