SKU: 77015761595

FASS DIFSL5P1001 Drop-In Series Diesel 2017-2023 GM

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Description

FASS DIFSL5P1001 Drop-In Series Diesel 2017-2023 GMFASS Fuel Systems Drop In Series Diesel Fuel System 2017 2023 GM (DIFSL5P1001) Fits: 2017 2019 Crew Cab Short Bed L5P Duramax Fits: 2017 2023 Crew Cab Long Bed L5P Duramax Part No: DIFSL5P1001 The FASS Drop In Series Diesel Fuel System was engineered by FASS to be the most effective filtration solution for the L5P Duramax. Backed by our limited lifetime warranty, the Drop In Series Fuel System protects your L5P Duramax from the issues caused by fuel

FASS Fuel Systems Drop-In Series Diesel Fuel System 2017-2023 GM (DIFSL5P1001)

  • Fits: 2017-2019 Crew Cab Short Bed L5P Duramax
  • Fits: 2017-2023 Crew Cab Long Bed L5P Duramax

Part No: DIFSL5P1001 The FASS Drop-In Series Diesel Fuel System was engineered by FASS to be the most effective filtration solution for the L5P Duramax. Backed by our limited lifetime warranty, the Drop-In Series Fuel System protects your L5P Duramax from the issues caused by fuel contamination.

Without proper fuel filtration, modern diesel injection systems are prone to excessive wear, which can cost THOUSANDS! By removing over 99 percent of the water from your diesel fuel, along with entrained air and debris down to 2 Microns, the Drop-In Series System protects the L5P's injection system from premature failure. A

dditionally, by eliminating the contaminants mentioned above, our Drop-In Series System for the L5P Duramax optimizes MPG (results will vary), restores horsepower, and sharpens throttle response.

And if reliability, optimized MPG, restored horsepower, and a sharper throttle response isn't enough, this system can be installed in an hour or less! This is a true plug-and-play system, requiring no cutting, wiring, or additional modifications.

Better still, this system requires ZERO tuning changes! Whether your L5P is stock or modified, our Drop-In Series Systems will not require adjusting tunes or clearing any codes. Our industry-leading water removal capabilities (3rd-party proven to exceed 99 percent) are reinforced by the unique design of our Extreme Water Separator (XWS).

If our XWS reaches capacity, it acts as a dam, shutting down your truck and preventing major destruction of fuel system components.

FASS Drop-In Technology was developed to achieve industry-leading filtration with the simplest possible installation-making our Drop-In Series Systems a true bolt-in upgrade. If you're mechanically inclined, a Drop-In Series Fuel System can be installed in your driveway in less than an hour!

But don't let the easy installation fool you-our Drop-In Series Fuel Systems offer the same world-class filtration as our Titanium Signature Series and Industrial Series lines.

Performance Radius Cuts (PRC) are an advanced machining technique used to improve the flow of fuel through the FASS System by creating smooth-flowing cuts within the aluminum housing.

This prevents the reintroduction of air and vapor back into the fuel and prevents eddy currents from forming within the corner of a 90-degree sharp angle. FASS Drop-In Fuel Systems are the only Fuel Air Separation System that incorporates these exclusive Performance Radius Cuts, lesser competitors commonly use T-Bone and square 90-degree fittings that can limit fuel flow, cause restrictions and reintroduce air back into your fuel.
2017-2023 L5P Duramax Drop-In Series System Features:

  • The only drop-in L5P filtration system that retains full functionality of the water-in-fuel sensor!
  • The only drop-in L5P filtration system with air separation!
  • Increases lubricity of the fuel by up to 10 percent by removing entrained air and air vapor.
  • Extends the life of fuel injection system components.
  • Over 99 percent free and emulsified water separation with our Extreme Water Separator technology.
  • 2 Micron absolute filtration rating.
  • 100 percent drop-In, no additional modifications needed.
Shipping Notes
  • Free Standard Shipping on $100+ Orders to the USA.
  • Except Preorder products are shipped in 48 hours.
  • Delivery to the USA:
  1. Standard Shipping : 3-10 business days
  • If time is of the essence, please consider selecting expedited delivery for faster service.
Exchange/Return Notes
  • We offer a 30-day return/exchange service after receiving.
  • Final sale items are not eligible for returns or exchanges.
  • To process your return/exchange, please contact us at [email protected]
  • Please click here for more details>>> Return & Exchange Policy
SKU: 77015761595

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4.6 ★★★★★
Based on 7 reviews
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Product Reviews
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Verified Purchase
lebowitzit
Fort Morgan, US
★★★★★ 5
Fits Fine, Looks Great, Sizing Makes No Sense
Size: 16.5" Neck 32"-33" Sleeve, Color: White, Size: 16.5" Neck 32"-33" Sleeve, Color: White
I hate shopping for dress shirts. For me, at least, it is a thoroughly frustrating experience, mostly because there's no consistency at all to the sizing. Actually, that's not quite true: dress shirts consistently DON'T FIT ME PROPERLY, which means I have to look at a lot of shirts and scrutinize size charts - which are usually incomplete, when they're provided at all - before finally finding The One. And sometimes, like this time, I don't manage to find The One. But this shirt comes close, as I will explain. The problem stems from my physique, which I never thought of as unique, but here it is: I'm short (just under 5'4", with a 40-41" chest, a little extra weight (so my middle is about the same), a 36" waist, 33" arms when measured the traditional way (more on that later) and a 16" neck. That last measurement is the single biggest problem: most shirt manufacturers apparently think that if you have a 16' neck, you are shaped like Omar the Tentmaker. Van Heusen is no exception. Note that this shirt is listed as "fitted". Now, that's a completely amorphous descriptor, which, I suppose, is true for most shirt fit descriptors these days. But if you look at Van Heusen's "regular" fit shirts, you'll find that they think if you have a 16" neck, you must have a nearly 50" chest and your waist is over 45". That's not regular, that's freakin' portly! I was afraid to even look at any of their Big & Tall men's dress shirts -- if their idea of regular fit was this skewed, then I didn't want to know what they think Big & Tall is. Thankfully, this is a "fitted" shirt, so Van Heusen thoughtfully provides the 16" neck version with a 42-44" chest and 36-38" waist. That's the size I bought, and it actually fits me pretty well. Still a little loose for a "fitted" shirt, but it doesn't look baggy, and that's what I was after. But a little more realism in the size descriptions would be greatly appreciated. Regarding the sleeve length, I really don't know what's up. I've seen charts that tell you how to measure it, but no matter how I measure it, I never manage to come up with any of the sleeve lengths provided on size charts. I have noticed that there appear to be two ways of measuring it, though. One way, which I call the traditional way because it seems to have been around longer, starts the measurement somewhere between the edge of the shoulder and the neck. At least, I think that's where it starts -- approximately. As I said before, I never manage to come up with the same number. But by this measurement, my correct sleeve length is 32-33", and the average guy's is probably 34-35". In the last year or so, when I shopped for shirts, I found some size charts using a different method, because the numbers were a lot lower, anywhere from 22" to 28". I have no idea where they came up with that measurement, nor do I know what mine is by this method, because the shirts I ended up buying so far have all used what I referred to as the traditional method. Anyway, the shirt looked quite nice on me, right out of the package, and continues to look quite nice on me after a couple of washings. The photo I attached is what the shirt looked like after being washed twice. I wash my shirts on my machine's Delicate cycle and hang them to dry. When cared for this way, the shirt does a pretty good job of living up to the listing's claim of wrinkle resistance. It doesn't come out perfectly smooth and crisp, but it looks good enough that I don't feel inclined to iron it. I decided on a poplin shirt because I was shopping for a summer-weight shirt that would breathe well. But poplin shirts proved nonexistent in my local stores, and not all that plentiful online. Poplin shirts listed online with full size charts so I could tell whether or not they might fit me were nearly as hard to find as igloos in the Mojave Desert, and poplin shirts whose size charts indicated that they were available with dimensions that would actually fit me were somewhere between that and hen's teeth. Needless to say, I was thrilled when I found this one. But the composition of poplin appears to be open to some interpretation. I own a few poplin business shirts (which I wear without suits and ties), and upon receiving my new Van Heusen shirts, it seemed to me that my poplin business shirts were lighter and breathed better. But then it occurred to me that shirt manufacturers often treat their material with coatings that improve the luster and crispness of their shirts for display purposes, and such coatings might be why my new shirts felt stiff, heavy and not particularly airy. Not wanting to give up and send the new shirts back, I decided to take a risk and launder them to see if that improved the feel. Thankfully, it did. After two washings, my new shirts are less shiny than delivered (which I'm fine with), a lot less stiff and breathe reasonably well. So... these shirts fit well, look good and feel good. Check, check and check. That means I'm fully satisfied with them, right? Wrong -- I am NOT fully satisfied with them. It's summertime. Summertime where I live is hot and often quite humid. I wanted shirts appropriate for that weather. To me, that has always meant lightweight broadcloth short-sleeve shirts. But it seems that today's Fashion Police have decreed that there is no longer such a thing as a short-sleeve dress shirt. They have decreed that today's well-dressed men must wear heavy cotton, long-sleeve shirts year-round. Well, excuse me for living, but some of us perspire when dressed that way in summer heat. Poplin shirts were presented to me as the compromise between acceptable modern fashion and comfort. Linen shirts were also recommended, but I couldn't find a single linen shirt what didn't have a crinkly, casual finish, much less one that was intended to be worn with a tie. With extreme effort, I found a poplin shirt that fits well, and I bought two of them, but while they are more comfortable in the sticky summer heat than heavy cotton, they are NOT as comfortable as my old short-sleeve dress shirts. I want new short-sleeve dress shirts, dagnab it! But until I successfully identify and locate all those insane Fashion Police, blow up their air conditioners and confine them to a Chicago Summer Simulator (otherwise known as a sauna) for three days in their heavy cotton shirts so that they will once again bless the manufacture of short-sleeve dress shirts, I guess these Van Heusen fitted long-sleeve poplin shirts will have to do.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on August 30, 2024
T
Verified Purchase
Tom McCartney
Boise, US
★★★★★ 5
Great quality and true to size labeled.
Size: 16.5" Neck 32"-33" Sleeve, Color: White
Top quality shirt at a great price. Sleeve and neck size true to as labeled. Material lightweight, which is perfect. I could not be happier with this purchase.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 22, 2026
C
Verified Purchase
Cut-AWAY
Draper, US
★★★★★ 4
Top neck button is hard to close!
Size: 18" Neck 32"-33" Sleeve, Color: White
The top neck button is hard to close when you need to wear a necktie, especially if you have arthritis of the fingers like I do! Also, If your neck is a size 18 , it’s a tighter than what I’m used to! Otherwise a great fit and nice material!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 6, 2026
S
Verified Purchase
Serguei
Bozeman, US
★★★★★ 5
Great fit
Size: 18" Neck 36"-37" Sleeve, Color: Lemon Glaze
Great fit. It’s hard for me to find a shirt that fits right, but this one works perfectly. Van Heusen makes reliable, good-quality shirts.
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on April 7, 2026
J
Verified Purchase
Juanita Ramirez
Louisville, US
★★★★★ 5
Beautiful Shirt
Size: 16" Neck 32"-33" Sleeve, Color: White
Great Shirt good quality!
WAS THIS REVIEW HELPFUL?YesReportShare
Reviewed in the United States on May 8, 2026

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