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3.3 Diesel Engine Fuel System
The diesel fuel system works much like the gas system. The main difference is the diesel system
is not equipped with anti-siphon valves, and there is always a fuel return line for the engine that
returns unused fuel to its respective fuel tank.
Proper diesel engine operation requires a good supply of clean, dry diesel fuel. Improper marina
fuel storage techniques, limited boat usage, etc. can cause the fuel to become contaminated.
Periodically, it may be necessary to pump accumulating water and contaminated fuel from the
bottom of the fuel tanks. If the fuel system on your boat becomes contaminated, contact your dealer
or the Pursuit Customer Relations Department for assistance.
Algae can grow in the accumulated water in diesel fuel tanks. This condition is most prevalent in
warm climates. Periodically adding a high quality diesel fuel additive containing an algicide may
be required to control algae in your boating area. Please contact your Pursuit dealer or engine
manufacturer for additional information regarding fuels and additives.
IMPORTANT: Do not allow the boat to sit unused for an extended period with the fuel
tanks less than full. Changes in temperature and weather conditions can
cause condensation in fuel tanks that are less than 3/4 full.
Diesel Fuel Filters
The diesel fuel filters are installed in the engine compartment near the engines. Some diesel fuel
filters are equipped with a sensor that will sound an alarm or light a warning light in the helm, if
too much water accumulates in the filter. A shut-off valve for each fuel line is located on the fuel
tanks. The fuel line shut-off valves should always be closed before servicing the fuel filters. Check
the filters for water before each use and replace the filter cartridge as needed.
Water is drained from the filters by placing a cup under the filter and draining through the petcock
at the bottom of the filter until clean fuel flows. It is particularly important to monitor the condition
of the fuel filters frequently because most diesel engines circulate much more fuel than they
consume. Because of the volume of fuel that flows through the filters, the elements must be changed
at least twice a season or more frequently depending on the quality of the fuel and the hours run.
Follow the filter or engine manufacturer’s instructions for cleaning and replacing the filter elements.
IMPORTANT: Diesel fuel systems may need to be primed after servicing. Refer to the
engine owner’s manual for information on priming the fuel system.
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