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XDP Fuel Filter Adapter, Bleeder Screw & Spacer w/ CAT 1R-0750 Filter
PART#
XD171 | SKU XD171
★★★★★
Vehicle Fitment For:
2001-2016 GM 6.6L Duramax LB7/LLY/LBZ/LMM/LML
See full application list below
$99.95
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Description
The XDP Fuel Filter Adapter, Bleeder Screw & Spacer with CAT 1R-0750 Filter is an easy way to change the fuel filter on your 2001-2016 GM 6.6L Duramax. The durable anodized filter adapter simply threads on to the OEM Filter Head and allows you run the Advanced High Efficiency CAT Filter on your truck. For an even easier filter change, a filter head spacer is included to give you more clearance for filter changes, along with an aluminum bleeder screw to replace the factory supplied plastic version that is commonly damaged during routine maintenance.
Features:
- Thread On Adapter - Uses Stock Filter Head
- Uses Advanced High Efficiency CAT 1R-0750 Filter
- No Modifications To Factory Fuel System Needed
Kit Contents:
- CAT 1R-0750 Filter
- Fuel Filter Head Spacer
- XDP Aluminum Air Bleeder Screw
- Anodized Filter Adapter with O-Rings
- All Required Hardware for Installation
Manufacturer Warranty*:
2 Year / Unlimited Mileage
2 Year / Unlimited Mileage
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
Customer Average
12 Hours
Recommended Specialty Tool
Reviews For XDP XD171
Verified Buyer
Horrible adapter kit for a LML
Zach (Santa Clarita) | May 23rd, 2026
YouTube video is very informative and great to watch to know how to do an adapter kit install; however, the adapter O-rings that come with this kit are awful, particularly the one that goes on the inside of the adapter. It is way too thick and will not install correctly on the truck due to that fact. In the video, the adapter threads on there smoothly however, that is not at all the case with an LML. Thankfully, customer service gave me a full refund for the product, but they definitely need to fix this O-ring problem. I ended up going with the Dmaxstore adapter after trying this one first, and the Dmaxstore adapter installed perfectly.
Note From Store Owner: Thank you for taking the time to share your feedback. We're sorry to hear that the item didn’t fit as expected. This can certainly be frustrating, and we understand your disappointment. This is not the experience we want for our customers, and we’re addressing this issue to help prevent it from happening again. Please don’t hesitate to reach out to our Customer Service Team using the help desk feature on our website.
Verified Buyer
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Chatty (south tx) | October 29th, 2025
Had to use the factory bleeder screw; the one y’all sent would leak and was too long to seal. Other than that seems fine.
Verified Buyer
LML WIF sensor fix
Zach (Kentucky) | August 22nd, 2025
Got rid of the wif sensor and upgraded filter. Can’t go wrong. Just be careful when installing the adapter, needs significant pressure to stay level while threading it on.
Verified Buyer
XDP Caterpillar Fuel Filter Conversion Kit
John (Kentucky) | April 16th, 2025
Finally installed this kit. Very easy to do. No printed directions, I found a XDP video online to help answer a question about the o-rings. It was very informative. I did a full Caterpillar filter conversion on my truck. I also installed the PPE Allison Deep Transmission Pan. The pan allows for an extra 4 quarts of fluid. My transmission has been about 15-20 degrees cooler so far. That's just some normal driving. I can't believe I waited so long to do this!
Verified Buyer
Cat filter adapter
Grady (Oregon) | January 30th, 2025
Product works good, super easy to install, and caused no issues.
Verified Buyer
Cat fuel filter adapter
Jake (Idaho) | April 8th, 2024
Super easy installation, definitely worth having if you have a CP4 pump. Noticed a big difference in fuel quality getting to the injectors.
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Frequently Asked Questions
What about the water in filter (WIF) sensor that goes on the bottom of the factory filter?
The Water in Filter (WIF) sensor at the bottom of your factory filter is disconnected. This sensor can be saved or discarded as it will not be re-installed. (Removal of the WIF sensor will not trigger a check engine light.)
Many will argue that the stock Duramax water separator is marginal. In our opinion, you’re better off running a quality fuel additive that totally disperses water like XDP’s Diesel Power Plus additive. This concentrated formula offers a combination of ingredients that not only improves lubricity, fuel economy, and overall performance, but also offers a number of preventative properties to help keep your diesel engine at its optimal performance. The fuel treatment comes in a 16-ounce bottles that treats up to 500 gallons of fuel. Item #XDDPP116
Many will argue that the stock Duramax water separator is marginal. In our opinion, you’re better off running a quality fuel additive that totally disperses water like XDP’s Diesel Power Plus additive. This concentrated formula offers a combination of ingredients that not only improves lubricity, fuel economy, and overall performance, but also offers a number of preventative properties to help keep your diesel engine at its optimal performance. The fuel treatment comes in a 16-ounce bottles that treats up to 500 gallons of fuel. Item #XDDPP116
How offten would this fuel filter need changing? I also did not see if the fuel filter has a water relief valve.
Suggested Filter Service Intervals:
Used as the primary fuel filter – 10,000 Mile Intervals
Used as the secondary filter along with an aftermarket fuel filtration systems (Airdog, FASS, Fuelab, Etc.) – 50,000 Mile Intervals
(The CAT Filter does not offer a water relief valve. We recomend running a quality fuel additive that totally disperses water like XDP’s Diesel Power Plus additive.
Used as the primary fuel filter – 10,000 Mile Intervals
Used as the secondary filter along with an aftermarket fuel filtration systems (Airdog, FASS, Fuelab, Etc.) – 50,000 Mile Intervals
(The CAT Filter does not offer a water relief valve. We recomend running a quality fuel additive that totally disperses water like XDP’s Diesel Power Plus additive.
Is the CAT filter more prone to clogging from fuel gelling?
Diesel fuel can begin to cloud around 32ºF and gelling can begin as high as 10ºF - 15ºF (depending on fuel quality and location). Gelling of diesel fuel can only be avoided by using fuel additives to lower the cloud and gelling point of your fuel. Running untreated diesel, in these weather conditions, can clog filters regardless of the filter micron.
Can this be ran without an aftermarket lift pump?
Absolutely, the XDP Duramax CAT Adapter can be run on vehicle with or without aftermarket fuel systems.
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Specifications For XDP XD171
MPN
XD171
SKU
XD171
GTIN
865978000045
ID
23823
Manufacturer Name
XDP
Shipping Weight
3.00 lb.
Shipping Length
11 in.
Shipping Width
6 in.
Shipping Height
6 in.
Fuel Type
Diesel
Manufacturer Warranty*
2 Year / Unlimited Mileage
Prop 65
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
WARNING: Cancer & Reproductive Harm - P65Warnings.ca.gov
Internal
L177R0
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