Tuning your L5P Duramax? FASS Fuel Systems has your back!

November 4, 2020

FASS Fuel System on 2017 Silverado L5P Duramax

Get the most out of your L5P with pure, water-free fuel!

*Please note, FASS Fuel Systems are only for tuned L5P Duramax trucks, and cannot be properly installed on a stock engine. 

Introduced in 2017 for the Chevrolet Silverado and GMC Sierra, the L5P is the most advanced, powerful Duramax diesel engine to date. The L5P’s specs are impressive too, packing a whopping 445hp and 910ft-lb of torque. 

It’s not hard to see why the L5P was a welcome replacement for the outgoing LML in GM’s heavy duty truck line. Not that the LML isn’t great, but the diesel market is hungry for more power and the newest technology! 

With that said, the L5P isn’t completely perfect. 

Like all diesel trucks, the OEM fuel system on L5P-equipped Silverados and Sierras leaves plenty of room for improvement. Even with GM’s factory filtration, air, water, and debris can still reach the engine, causing premature component failure and reducing performance. 

Tuning your L5P? Your engine deserves FASS.

Engineered specifically for tuned 2017-2019 L5P (2020+ coming soon), FASS Diesel Fuel Systems offer next-level fueling for modified Silverado/Sierras. Featuring our Extreme Water Separator, our system removes over 99% of the water from your diesel fuel, as well as all of the air and debris. 

Immediately, this improves performance, drivability, and efficiency*. Over the course of thousands of miles, a FASS system protects cost injection components–potentially saving you thousands of dollars! 

Make the most of your mods! 

With L5P Duramax tuning on the rise, we knew our systems would have to support a wide range of horsepower levels. So, no matter how modified your truck, there’s a FASS Fuel System for you! 

From less than 500hp all the way up to 1,200+hp, our Titanium Signature Series lift pumps allow you to take advantage of every performance upgrade. By eliminating the restrictive stock fuel system, FASS pumps push as much as 240 gallons-per-hour! 

This is a huge upgrade over stock, and enables L5P owners to support the following upgrades:

  • Aftermarket Tuning (Required to install a FASS Fuel System on the L5P Duramax)
  • Oversized Injectors
  • Larger/Compound Turbos
  • And more!


  • Fits all tuned 2017, 2018, and 2019 L5P Duramax-powered Chevrolet Silverados and GMC Sierras
  • Compatible with Sierra 2500 & 3500, as well as Silverado 2500 & 3500
  • Fits all trim levels, including Base, SLE, SLE RWD, SLT, Denali, Denali RWD, Work Truck, Work Truck RWD, LT, LT RWD, LTZ, LTZ RWD, and High Country

FASS Diesel Fuel Systems are proudly engineered and manufactured right here in the U.S.A, and are backed with a limited lifetime warranty. 

Have questions about which FASS Diesel Fuel System is right for your truck? Don’t hesitate to contact our team by phone at (636)-433-5410, or via email at techsupport@fassride.com

*Fuel mileage increases vary by vehicle, location, and operation conditions. FASS Diesel Fuel Systems cannot guarantee fuel economy improvements. 

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