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USD 28
Part #: PTFF100-2

AirDog FF100-2 Replacement Fuel Filter (2 Micron)

For use on AirDog Air/Fuel Separation Systems
Part #: PTFF100-2
★★★★★ ★★★★★ 4 Reviews
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The AirDog Replacement Fuel Filter FF100-2 is a direct replacement Fuel Filter for your AirDog Fuel System. The life expectancy for the AirDog Fuel Filter could be up to 25K miles or a year. However, those figures can change drastically depending on fuel quality. Order a few extra and keep them in your cab or toolbox.  

  • 2 Micron Filtration Rating
  • Genuine AirDog Replacement 
  • Fits All AirDog & AirDog II Kits 


  • MFG. Number FF100-2
  • Manufacturer Name AirDog by PureFlow
  • Shipping Weight 2.00 lb.
  • Shipping Length 13 in.
  • Shipping Width 10 in.
  • Shipping Height 7 in.
  • Fuel Type Diesel
  • UPC 813094013609
  • Warranty Yes
  • Warranty Info Limited Lifetime
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Internal L96.00R173.00


★★★★★ ★★★★★
5.0/5 Stars out of 4 Reviews
Verified Buyer
Great service
Came fast
Came fast, shipped no damage, no issues
Hasn’t gelled yet
I’m in north central Kansas and haven’t had them gel yet. So it’s nice to still be able to run the finer filter during winter.
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Questions and Answers

Will this filter fit my AirDog 150 lift pump?
View Staff Answer 

The Airdog FF100 and WS100 are the proper replacement filters for all (Airdog) & (Airdog II) fuel systems. (Light Duty Applications)

How often to change this filter and the water separator?
View Staff Answer 

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 under side 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.

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