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FASS DFD-4000 Duramax Fuel Filter Delete
PART#
DFD4000 | SKU FASSDFD-4000
★★★★★
Vehicle Fitment For:
2001-2016 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML
See full application list below
$77.90
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Description
The FASS DFD-4000 Duramax Fuel Filter Delete for your GM 6.6 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.
Features:
- 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 
This product can not be shipped to these states/provinces: CA
This product can not be shipped to these states/provinces: CA
Instructions & Tech Info
Installation Info
Reviews For FASS DFD4000
Overall Rating
/5
5 Reviews
Rating Snapshot
2
3
0
0
0
Verified Buyer
filter delete
tom (ohio) | February 19th, 2026
Easy install, but u must remove the check ball and spring from the factory housing, or the truck wont start
Verified Buyer
(#2127199) Filter Delete
AL (OK City OK) | November 17th, 2023
Easy to install if you follows directions online, nicely machined and looks good.
Verified Buyer
Works like it should, but....
Jim (Joliet) | May 11th, 2021
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
Cory (Michigan) | March 30th, 2021
Very easy to install and shipped fast Order # 1364955
Review
James (Sarasota, FL) | December 8th, 2015
Product is exceptional quality. Does not include replacement gasket for WIF.
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Frequently Asked Questions
What happens to the water sensor when this is installed?
The water sensor can be reinstalled on the bottom of the filter delete housing.
What size is the port for installing fuel pressure gauge
The Fass DFD-4000 Duramax Fuel Filter Delete's built in fuel pressure gauge port is 1/8" NPT.
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Specifications For FASS DFD4000
MPN
DFD4000
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
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
Cross Reference #
DFD4000
Internal
L32R28
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