Husqvarna HUV4421D Owner's Manual page 46

NOTE: Biodiesel fuel does not have long-term stability and must not be left in engines longer than three
months. This fuel type attracts moisture and may contain higher water content than conventional
diesel fuel.
Fuel system maintenance, cleaning, and fuel line replacement are required more frequently for
engines that are operated with Biodiesel fuel.
DRAINING WATER FROM FUEL FILTER
Diesel Vehicles Only
Water should be drained from the fuel filter daily. The fuel filter is mounted on a plate by the lower seat support
panel (Figure 37).
1. Position a pan under the fuel filter.
2. Lift the passenger-side seat.
3. Locate the valve (1) on the underside of the filter. Turn the valve clockwise until water begins to stream
from the filter.
4. Drain the water until it changes color (to fuel). See following WARNING.
ý
WARNING
• Clean up spilled fuel. Keep sparks and flames away from the vehicle and service area. Failure
to heed this warning could result in an explosion or fire, resulting in severe personal injury or
death.
5. Close the valve by rotating it counterclockwise until the valve is firmly sealed.
6. To resupply the filter with fuel, turn the key switch to the ON position for 10 seconds. See following
NOTE.
NOTE: Dispose of water according to the environmental laws and regulations for your area.
Figure 37 Fuel Filter
Page 44 2007 HUV 4421 Gasoline and Diesel Vehicle Owner's Manual
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Fueling Instructions