For diesel truck owners looking to enhance performance, optimize fuel economy, and protect their injection system, a FASS (Fuel Air Separation System) Diesel Fuel System is a popular and highly effective upgrade.
But with a variety of models and flow rates available, selecting the right one can seem daunting. This guide will walk you through the key considerations for picking the perfect FASS Diesel Fuel System for your truck—and how to get more information directly from the experts.
Why install a FASS Diesel Fuel System?
Stock diesel fuel systems fall short when it comes to fuel quality, and often lack proper fuel flow—especially on modified trucks. They are prone to introducing air and vapor into the fuel, which can reduce horsepower, fuel mileage, and damage expensive components like injectors and injection pumps.
A FASS Diesel Fuel System System combines a high-volume fuel pump with an advanced filtration system. It removes entrained air/vapor, water, and debris (down to 2 Microns) from the fuel before it reaches the engine. This “polishing” of the fuel results in a FAR cleaner, steadier fuel supply, leading to:
- Increased Horsepower and Torque: By providing the injection system with pure fuel, a FASS system can unlock your engine’s true potential.
- Improved Fuel Economy*: Many users report a noticeable increase in miles per gallon (MPG) after installing a FASS System.
- TRIPLE Injection System Life: Superior water, debris, and air/vapor filtration protects your injectors and injection pump from premature wear and failure, saving you from costly repairs down the road. In fleet testing, FASS fuel filtration has delivered 3x (yes, triple) the life out of injection pumps and injectors.
- Smoother and Quieter Engine Operation: The removal of air from the fuel system results in a smoother idle and quieter engine performance.
Which FASS do I need: A Step-by-Step Guide
Choosing the right FASS Diesel Fuel System primarily comes down to your truck’s make, model, year, and its horsepower output.
Identify Your Truck’s Engine:
FASS offers Fuel System Kits for the most popular diesel truck platforms:
- Ford (Powerstroke): Whether you have a classic 7.3L, a 6.0L, 6.4L, or the modern 6.7L, FASS has a tailored solution.
- Dodge/Ram (Cummins): From the venerable 12-valve and 24-valve 5.9L to the later 6.7L engines, there is a FASS system designed for your Ram.
- Chevy/GMC (Duramax): FASS provides comprehensive kits for all generations of the Duramax engine, from the LB7 to the latest L5P.
Determine Your Horsepower Level:
This is the most critical factor in determining the required flow rate, measured in gallons per hour (GPH). Each FASS Diesel Fuel System (other than Drop-In Series Fuel Systems ) is assigned a GPH and corresponding horsepower rating. For example, some common GPH and horsepower rates for FASS Diesel Fuel Systems are:
- Stock to 600 HP: 100 GPH
- 600 – 900 HP: 140-165 GPH
- 900 – 1200 HP: 220-250 GPH
- 1200+ HP: 260-540 GPH
If you have performance upgrades planned for the future, it is perfectly fine to install a slightly higher GPH rating than your engine currently requires. The FASS system will only supply the amount of fuel the engine demands , so you cannot “over-fuel” it with a higher-rated GPH system.
Select the right FASS Series:
FASS offers several series to meet different needs and budgets:
- Titanium Signature Series/Titanium Signature Series PLUS: This is FASS’s flagship product line for Cummins, Duramax, and Powerstroke-powered pickup trucks. It is the ideal choice for most truck owners—from daily drivers to heavily modified competition trucks.
- Drop-In Series : For diesel truck owners looking for an easier installation, the Drop-In Series utilizes the factory in-tank fuel pump and provides full FASS Fuel Filtration. This is a budget-friendly, easily installed option for stock or lightly modified trucks.
- Industrial Series: Designed for heavy-duty and commercial applications, the Industrial Series Fuel Systems are built for extreme conditions and constant use. These systems are a great fit for semis, farm equipment, construction equipment, and more.
When in doubt, contact us!
If you are still unsure which system is right for you, or if you have a highly modified or unique application, the technical support team at FASS is an invaluable resource. They can provide personalized recommendations based on your specific needs.
You can reach FASS Diesel Fuel Systems through the following channels:
By carefully considering your truck’s specifications and your performance goals, you can confidently select a FASS Diesel Fuel System that will provide years of reliable service and tangible benefits.
*Fuel economy increases will vary according to driving habits, fuel quality, and MPG tracking method—among other factors. FASS cannot guarantee a measurable MPG increase, though it certainly is common.
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