The 6.7L Powerstroke is one of the most advanced diesel engines Ford has ever built, but like all modern high-pressure common-rail diesels, it’s extremely sensitive to fuel quality. Clean, air-free fuel is critical to injector life, fuel pump health, and long-term reliability—which is exactly why so many 6.7 Powerstroke owners upgrade to FASS Diesel Fuel Systems.
With multiple flow rates, system styles, and installation options available, choosing the right FASS system may seem overwhelming at first. This guide breaks it down simply so you can find the best fit for your truck and how you use it.
FASS Fuel Systems for the 6.7 Powerstroke include both our Titanium Signature Series variations (PLUS, No-Drop, etc); and the Drop-In Series. While the Titanium Signature Series Fuel Systems provide both fuel filtration
and flow, the Drop-In Series Fuel System is a bolt-in filtration unit that relies on your stock in-tank pump to push fuel through it.
Don't worry, we'll explain why you'd choose one system over the other below.
Step 1: Choosing the Right Flow Rate (GPH)
Unless you're choosing our
Drop-In Series Fuel System that utilizes your factory tank for fuel flow (more on that below); you'll need to select the right flow rate.
Flow rate—measured in gallons per hour (GPH)—is the most important starting point. The goal is to choose enough fuel flow for your setup, without oversizing.
- Stock & Lightly Modified Trucks
Most stock or lightly tuned 6.7 Powerstrokes do not require increased fuel volume. These trucks benefit most from improved filtration, air/vapor separation, and fuel conditioning, not raw flow. - Moderately Modified Trucks
Trucks with tuning, exhaust upgrades, or mild injector changes may benefit from higher flow to support increased fuel demand under load. - High-Horsepower / Competition Builds
Trucks with large injectors, aggressive tuning, or competition use require significantly more fuel volume and consistent pressure.
FASS offers multiple flow rates to match each of these needs, ensuring your system is properly sized for performance
and quiet operation.
Step 2: Drop-In Series vs. Full FASS Fuel Systems
FASS Drop-In Series – Perfect for Stock & Lightly Modified 6.7 Powerstrokes
For
2017+ 6.7 Powerstroke trucks that are stock or lightly modified, the
FASS Drop-In Series Fuel System is often the best starting point.
The Drop-In Series:
- Utilizes the factory in-tank fuel pump for fuel flow
- Adds full FASS 2-micron filtration, air/vapor separation, and water removal
- Installs easily using factory mounting locations
- Provides excellent injector and fuel system protection without unnecessary complexity
If your factory pump is healthy and you’re not chasing big horsepower numbers, the
Drop-In Series delivers maximum protection with minimal installation effort.
Titanium Signature Series – Dedicated Lift Pump & Maximum Control
The FASS Titanium Signature Series is a complete fuel system upgrade that includes its own dedicated lift pump.
This system is ideal for:
- Higher-mileage trucks
- Trucks with increased fuel demand
- Owners planning future performance upgrades
- Drivers who want maximum fuel pressure stability
Key benefits include:
- Consistent, positive fuel pressure
- Reduced strain on the factory fuel system
- 2-micron filtration and air/vapor separation
- Improved fuel lubricity and injector longevity
Step 3: PLUS and No-Drop Variants Explained
Once you’ve selected the system type, you can further tailor your setup with
PLUS and
No-Drop options.
PLUS Systems – Upgraded Hardware
The PLUS versions of FASS fuel systems feature:
- Black O-ring boss (ORB) fittings
- Cleaner, more professional appearance
- Improved sealing and easier serviceability
Performance is identical to standard systems—the PLUS upgrade is about premium hardware and fit-and-finish.
No-Drop Systems – Faster Installation
No-Drop systems include the FASS Single-Bolt Fuel Sump, allowing installation without removing or lowering the fuel tank.
Benefits include:
- Faster installation
- Bottom-draw fuel pickup for consistent supply
- No tank removal required
No-Drop systems are available in both standard and PLUS configurations.
Quick Recommendations
If you want a simple answer:
- Stock or lightly modified 6.7 Powerstroke (2017+):
FASS Drop-In Series - Higher-mileage or future-build truck:
Titanium Signature Series - Premium look & upgraded fittings:
Titanium Signature Series PLUS - Easiest install with premium hardware:
Titanium Signature Series PLUS No-Drop
Final Thoughts
Choosing the right FASS Fuel System for your 6.7 Powerstroke comes down to three things:
fuel demand, truck condition, and long-term plans.
Whether you choose the Drop-In Series for simplicity or a Titanium Signature Series system for maximum control and future growth, every FASS system delivers cleaner fuel, quieter operation, improved fuel lubricity, and extended injector life.
If you’re ever unsure, our customer service team is always happy to help you dial in the perfect setup for your truck.
