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USD 77.9
Part #: FASSDFD-4000

FASS DFD-4000 Duramax Fuel Filter Delete

Vehicle Fitment:
2001-2016 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML | See full application list below
Part #: FASSDFD-4000
★★★★★ ★★★★★ 4 Reviews
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The FASS DFD-4000 Duramax Fuel Filter Delete for your 2001-2016 GM 6.6L Duramax is for use after the installation of a FASS Fuel Air Separation System. Once installed the factory fuel filter is no longer needed and can be easily removed by using this Factory Fuel Filter Canister Delete. Because your Duramax fuel filter is located after the FASS filtration system you will still need to replace the factory filter every 5,000-8,000 miles. This filter delete kit will replace your now useless fuel filter with a spin on canister that will allow fuel to flow freely into the engine, saving you even more money. This spin on Fuel Filter Delete Kit is a perfect addition to your FASS Titanium diesel fuel pump and comes with all required hardware for a professional installation.

  • Installs In Place Of Stock Filter 
  • Allows For Unrestricted Fuel Flow To Engine 
  • Built-In Gauge Port For Fuel Pressure Monitoring
  • Eliminates Costs Associated With Changing Stock Filter
Note: This product is ONLY for use on trucks that already have another form of filtration such as a FASS Titanium Series Fuel System. 
Shipping Restrictions Apply shipping restriction icon This product can not be shipped to these states/provinces: CA


  • MPN DFD-4000
  • SKU FASSDFD-4000
  • GTIN 850044106721
  • ID 19009
  • Manufacturer Name FASS
  • Shipping Weight 2.00 lb.
  • Shipping Length 4 in.
  • Shipping Width 4 in.
  • Shipping Height 4 in.
  • Fuel Type Diesel
  • Prop 65 Prop 65 WarningWARNING: Cancer & Reproductive Harm -
  • Cross Reference # DFD4000
  • Internal L34R14


★★★★★ ★★★★★
4.5/5 Stars out of 4 Reviews
Verified Buyer
(#2127199) Filter Delete
Easy to install if you follows directions online, nicely machined and looks good.
Verified Buyer
Works like it should, but....
Works like it should, BUT there parts you need to remove from the factory filter mount before it will work. Wish it came with instructions but FASS has a video on their youtube. Order 2038927
Verified Buyer
FASS Fuel Filter Delete
Very easy to install and shipped fast Order # 1364955
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Questions and Answers

What happens to the water sensor when this is installed?
View Staff Answer 

The water sensor can be reinstalled on the bottom of the filter delete housing.

What size is the port for installing fuel pressure gauge
View Staff Answer 
The Fass DFD-4000 Duramax Fuel Filter Delete's built in fuel pressure gauge port is 1/8" NPT.

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