Watch this BEFORE upgrading your L5P Duramax!

While there are other L5P Duramax fuel systems on the market, some of them miss the mark in one or two key areas. Thanks to our engineering team, our new L5P Duramax Fuel System retains the full functionality of the factory water-in-fuel sensor!
Best of all, this system requires ZERO tuning changes-and is 100% plug-and-play.
Packing the same filtration technology as our Signature Series line, this plug-and-play fuel system optimizes MPG, protects EXPENSIVE injection components, restores horsepower, improves cold weather performance, and sharpens throttle response.
Our drop-in L5P Duramax Fuel System installs in under an hour and offers unmatched fuel filtration. Backed by 3rd party testing, our Extreme Water Separator removes over 99% of the water found in diesel fuel, along with any debris down to 2 Micron absolute.
Ready to protect your truck? Stay tuned-our L5P Duramax Fuel System hits the shelves in early 2023!
*MPG improvements will vary according to driving habits, conditions, fuel quality, and vehicle modifications. FASS cannot guarantee a measurable MPG increase.

[@PoBoysDiesel]

Fass never stops looking for solutions for all the platforms If Ive said it once Ive said it a Million times #Fassforthewin

[@FASSFuelSystems]

We appreciate you man, thank you for all the amazing support!

[@davekrause9619]

Took me a while to decide but I am purchasing one of these for my 2018 Denali. I had one of your lift pumps on my 08 Duramax and never had any issues.

[@FASSFuelSystems]

We appreciate that!!

[@davekrause9619]

@@FASSFuelSystems what heater do you recommend to use with this?

[@FASSFuelSystems]

@@davekrause9619 Thank you for reaching out about this and we have the link here for the heater kit that goes with the Drop-In series: fassride.com/shop/product/fuel-air-separation-systems/drop-in-series/fass-diesel-fuel-systems-drop-in-series-electric-heater-probe-kit-difshk1001/

[@mrmotofy]

It makes sense as explained

[@FASSFuelSystems]

Thank you, we appreciate the feedback!

[@alexx9563]

Has this been released yet? Looking forward on getting one for my 2023 duramax

[@FASSFuelSystems]

It'll be out soon! We'll keep everyone posted when we release it.

[@HeavyP]

Do these systems comply with factory GM warranty?

[@FASSFuelSystems]

Great question and the FASS won't affect the GM warranty on the truck. Since we exceed the factory filtration.

[@canamxmr4760]

Hey fellas, Will y’all be releasing a kit for the 3.0 duramax?

[@FASSFuelSystems]

We do plan to release a kit for the 3.0, but we apologize as we don't have a good eta for when.

[@canamxmr4760]

10-4. Thanks.

[@FASSFuelSystems]

@@canamxmr4760 🙌🙌

[@fobranator4.636]

Will this work with an S&B bigger fuel tank in a 2022 Silverado 2500 CCSB Duramax?

[@FASSFuelSystems]

Yes sir, this will work with a larger tank. With it being a plug, and play system it will use the fuel lines from the truck, and replace the stock fuel filter housing. If you have any further questions, or concerns we'd be happy to help. Our service team number sis 636-433-5410. Thank you!

[@eldorian6097]

Would you guys think it’d be worth it in a stick truck with 212k miles?

[@FASSFuelSystems]

For sure, the FASS system will benefit any diesel truck at any mileage!

[@stevekudrick4271]

I can't find this on the fass website for my 2019 duramax

[@FASSFuelSystems]

Hey Steve, thank you for reaching out. We do apologize sir as this new system hasn't been released just yet. We will keep everyone posted though on when it is released!

[@BRENTWELLS-id4ov]

So on this new system you will not have to drop the tank? What are you looking at roughly as retail price? How soon till it gets here I am ready to order?

[@FASSFuelSystems]

Great questions! That's correct, you will not have to drop the tank-installation should take an hour or less. We aren't releasing pricing just yet, but it will be VERY competitive with other options on the market, while offering the best filtration possible. This will be released by Q2 of this year, but we don't have an official ETA just yet. We'll be updating that A.S.A.P!

[@BRENTWELLS-id4ov]

@@FASSFuelSystems Awesome cant wait my 2021 could use that set up. One more question. Since yall removed the drain valve on the XWS filters how often or when do you need to change it out? Just use the factory computer on the truck to run its course? Thanks again.

[@FASSFuelSystems]

@@BRENTWELLS-id4ov great question, and we would suggest changing the filters every 20-30k miles, or yearly. Whichever comes first.

[@tallokie67]

What's your thoughts on fuel additives with these filters, yes or no? If yes, what type of products would you recommend or not recommend? I'm about to replace the fuel pump on my stock/untuned '17 L5P. Underload the truck kill power to the engine, scanner shows only 16 psi from pump. Would you recommend the TS C13 140G or wait till this new filter system to come out?

[@FASSFuelSystems]

Hey Josh, thank you for reaching out! On a 2017 truck that kit will work great, and you can run additives through our systems as well. Thank you sir!

[@kab5275]

Will this system “polish” the fuel like how the titanium series does?

[@FASSFuelSystems]

@@kab5275 Great question, and yes sir it absolutely will!

[@nabatron21]

What’s the maintenance schedule on this?

[@FASSFuelSystems]

We appreciate you asking and typically we suggest every 20k-25k miles or 1yr whichever comes first.

[@nabatron21]

@@FASSFuelSystems and what would the maintenance entail? Just replace the filters of both?

[@FASSFuelSystems]

@@nabatron21 Appreciate you asking and yes, maintenance on the system would just be replacing the filters.

[@nate87459043]

Would this work for the 3.0l duramax?

[@FASSFuelSystems]

Hey Nathan, thank you for reaching out! Great question, and we do apologize as this wouldn't work with the 3.0 Duramax. If anything changes though we will keep everyone posted!

[@coltonlefever4100]

Is the available for purchase yet

[@FASSFuelSystems]

Not quite yet! Our engineering team is working hard to have these ready in the coming months. We'll post any updates right away!

[@user-wo3nw3rd2v]

Do you use the factory plastic cover or housing? Do you recommend one of those aluminum ones that are out on the market or stick to the plastic factory? Is the FASS manifold all aluminum? I am fixin to pull the trigger today and order. Thanks

[@FASSFuelSystems]

Hey Brent, great questions sir and we'll be happy to help out! The FASS Drop-In System is in an all-billet aluminum housing, but utilizes the factory filter cap and will accept billet filter caps. We will be releasing our own billet cap as well in late spring 2023. If you have any other questions, or need anything you are more than welcome to reach out anytime! fassride.com/shop/product-category/shop-category/2020-2022-6-6l-l5p-duramax/

[@user-wo3nw3rd2v]

@@FASSFuelSystems the new system does not come with a factory filter either does it? So I use my original cap and need to buy a new GM filter.

[@FASSFuelSystems]

@@user-wo3nw3rd2v That is correct sir you will utilize the factory cap, and filter with the WIF sensor.

[@lowlifegarage]

Man runvse was talking some mad sh*t about you guys. I find the comentary funny. Thanks for the video. Im sorry, but i trust the name Fass.

[@FASSFuelSystems]

We really appreciate that, thank you for all the support!!! 👊

[@lowlifegarage]

@FASSFuelSystems just installed mine today. I try and explain the difference, but most who haven't had a fass just don't understand. "It just runs smoother"

[@FASSFuelSystems]

@@lowlifegarage We appreciate everything you do for us, thank you!