PureFlow AirDog®
AirDog® II DF-100, DF-165, & DF-200 2001-2010 Duramax Diesel
Section 9 Fuel Filter and Water Separator
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AirDog®
WATER
SEPARATOR
AirDog®
2 MICRON
FUEL FILTER
WATER DRAIN
VALVE
FILTER SERVICE RECOMMENDATIONS
Plugging of either the fuel filter or the water separator itself will cause low fuel pressure and
low flow to the engine. If a low fuel pressure issue exists, replace the fuel filter. Typical fuel
filter life is 15-20k miles depending on fuel quality.
The Water Separator
Replace the water separator every other time you change the Fuel Filter or if it becomes
damaged or plugged. It is suggested to check/drain the water separator every three months or
as needed should you experience excessive ‘water in fuel’ conditions. When installing the water
separator, be sure to clean the underside of the AirDog® base. Follow the instructions printed
on the pre-filter for proper tightening procedures.
CAUTION:
Be extremely careful to prevent any contaminates or debris from entering the pre-
filter when removing it for cleaning! Large debris will jam the Gerotor and cause the fuse to
blow. This is not a warranty item. Should this happen, you can easily put the system back into
working order. See the instructions on “How to clean the Gerotor” for proper procedures.
The Fuel Filter
Remove the fuel filter by turning it counter clockwise.
DO NOT
pre-fill the fuel filter with fuel.
The AirDog® will fill the filter and prime the system automatically. Follow the instructions on
the filter for proper tightening procedures.
CAUTION:
Dispose of waste fuel and used filters properly