Are you looking to upgrade the performance of your fuel system? Unleash the full potential of your Ford 6.4L Powerstroke by upgrading to a FASS Fuel System. These pumps are available in four optimized flow rates: 100 GPH, 165 GPH, 250 GPH, and 290 GPH. You’re looking at a complete fuel system upgrade designed to replace your factory lift pump and completely transform how your diesel delivers fuel. This system is built to address common fuel-related issues, such as air in the fuel, inconsistent pressure, and poor filtration, all of which can shorten injector life and limit performance. Whether you’re running stock or a tuned setup, upgrading to a FASS system means cleaner fuel, steadier pressure, and added confidence under load.

Which Flow Rate should you choose?

When it comes to upgrading your fuel system, choosing the right GPH (gallons per hour) rating isn’t about picking the biggest number; it’s about matching your pump to your truck’s real-world demands. A FASS aftermarket fuel system doesn’t just supply fuel, it improves filtration, removes air/vapor, and ensures your injection system gets consistent, reliable pressure. But choosing between 100, 165, 250, and 290 GPH? That’s where a lot of people get stuck.

100 GPH: Best for Stock Daily Drivers (STOCK-600 HP)

• Perfect for stock or very lightly modified trucks. If you’re mainly commuting, doing occasional light towing, and just want better reliability and fuel quality, this is all you need. It’s a straightforward upgrade that fixes factory fuel system issues without going beyond what your truck actually requires.

165 GPH: Best for Tuned and Working Trucks (600-1000 HP)

• This is the sweet spot for most owners. If you’re running tuning, towing regularly, or planning mild upgrades, the 165 GPH system gives you the extra fuel supply to handle increased demand without going overkill. Ideal for trucks that work hard but still see daily use.

250 GPH: Best for Performance Builds (900-1200 HP)

• Designed for trucks with larger injectors, aggressive tuning, or higher horsepower goals. If your setup is built for performance and sees hard acceleration or sustained load, the 250 GPH system keeps your fuel system up to the task when it matters most.

290 GPH: Best for High HP & Heavy-Duty Use (1200-1500 HP)

• Built for serious builds and extreme demand. If you’re pushing big horsepower, running competition setups, or towing heavy under constant load, this is the system that delivers maximum fuel supply. It’s also the right choice if you want room to grow into future upgrades without having to upgrade again later.

The Titanium Signature Series diesel fuel Systems are the superior fuel System and filtration System in the diesel industry. This is because at FASS Diesel Fuel Systems, they focus on perfecting their systems and engineering, taking the extra steps that the competitors ignore while rushing to get product out the door. By doing this, they have a less than 1% failure rate with the motor and a design that implements unique features you can only get with FASS Diesel Fuel Systems.

• FASS Whispering Technology (FWT)was engineered to meet the stringent demands of today’s quiet diesel engines. FASS Whisper Technology was under development and testing for over two and a half years to meet FASS Fuel System’s high-quality and durability standards. FASS Whisper Technology effectively and drastically reduces the sound levels of the Signature Series FASS Diesel Fuel System to a “whisper” while at the same time increasing fuel flow rates. Our competition reduces noise levels by reducing flow rates.
• Performance Radius Cuts (PRC)are an advanced machining technique used to improve fuel flow through the FASS System by creating smooth, flowing cuts in the aluminum housing. This prevents the reintroduction of air and vapor into the fuel and prevents eddy currents from forming at the corner of a 90-degree angle. FASS Titanium Signature Fuel Systems are the only Fuel Air/vapor 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/vapor back into your fuel.
• Mass Flow Return (MFR)technology continually polishes your fuel by maintaining a positive pressure on the fuel delivered to the engine, preventing cavitation and galling/scoring, and then returning the fuel that’s not yet needed back to the tank after it's passed through the filtration process, removing dirt, air, vapor, and water. This means your fuel is constantly “Polished” (cleaned), ensuring your diesel truck always has the cleanest fuel possible. The MFR, in combination with the optional FASS Fuel Heater options, will help ensure “EXTREME” cold weather operations!
• Bolt-On Bracket Mounts: old mounting styles required drilling or welding when mounting your new System. This has now been simplified with our new bolt-on brackets that utilize your Ford Super Duty factory bed bolt, the bolt that secures your truck bed to your frame. Mounting your Titanium Signature Series System takes only minutes, and all brackets are made from machined steel for superior support and strength.