FASS Titanium Signature Series Fuel Lift Pump 20-23 GM 6.6L Duramax L5P

Are you looking to maximize the performance of your fuel system? Unleash the full potential of your 6.6L Duramax by upgrading to a FASS Fuel System. These pumps are available in multiple optimized flow rates to match everything from stock trucks to higher-demand builds. You're looking at a premium, complete fuel system upgrade designed to replace your factory lift pump and completely transform how your diesel delivers fuel.

These systems are designed to address common Cummins fuel issues, such as inconsistent fuel pressure, air intrusion, and inadequate filtration, which can affect pump performance and long-term reliability. Whether you're running a stock setup or have turned up the fuel, upgrading to a FASS system means cleaner fuel, more consistent pressure, and added confidence every time you get into the throttle.

Which Flow Rate should you choose?

When upgrading your fuel system, choosing the right GPH (gallons per hour) rating isn't about picking the highest 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 140, 220, and 240 GPH? That's where a lot of people get stuck.

140 GPH: Stock Reliability Upgrade (STOCK-700 HP)

• Perfect for stock trucks or very mild setups. If you want to eliminate factory fuel issues and improve reliability without overbuilding your system, this is the ideal choice.

220 GPH: Daily Driver + Towing Sweet Spot (700-900 HP)

• Best for trucks with mild tuning or regular towing. This is the most popular option for owners who want extra fuel capacity without going overkill.

240 GPH: Performance Builds (900-1200 HP)

• Designed for higher horsepower setups with increased fuel demand. Ideal for trucks running upgraded injectors or pushing harder under load.

FASS Fuel Systems engineered the Titanium Series diesel fuel lift pump to be the top-performing, longest-lasting, and most reliable aftermarket filtration system in the diesel industry. The Titanium Series lift pump is capable of supporting your GM Duramax 6.6L diesel engine with enough fuel for multiple fueling system upgrades. A Titanium Series lift pump also offers advanced filtration that helps protect your Duramax's injection system, effectively extending the life of your Injection Pump and Injectors. These benefits include an improved filtration rating of 2 Microns, a built-in water-separation filter, and FASS Fuel Systems' patented air/vapor removal process. Duramax diesel engines are known for injector failures; several factors can cause them, and FASS Filtration Systems is designed to eliminate those that are fuel-related.

• FASS Whisper Technology (FWT)was developed by the engineering team at FASS Fuel Systems to reduce the noise generated by aftermarket diesel lift pumps for fuel and air separation. By using radius cuts, tighter tolerances on all gears, and a high-quality, military-specification coating over the aluminum base, FASS Fuel Systems developed the quietest fuel-air separation system on the market.
• Performance Radius Cuts (PRC)are an advanced machining technique used to improve fuel flow through the diesel lift pump by creating smooth, flowing cuts in the aluminum housing. This prevents the reintroduction of air and vapor into the fuel and also prevents stagnant fuel pockets from forming in the corner of a 90-degree bend. FASS Fuel Systems Titanium Series Diesel Fuel Pumps 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.
• Mass Flow Return (MFR)technology is used to continually “polish" your fuel by keeping a positive pressure on the fuel being delivered to the engine and returning the fuel that's not yet needed back to the tank after it has been passed through the filtration process, removing dirt, air, vapor, and water. This means your fuel is constantly moved and cleaned, ensuring your diesel truck always has the freshest, cleanest fuel possible.
• Bolt-on bracket mountsare another huge benefit to the Titanium Series lift pumps. Old mounting styles required drilling or welding when mounting your new pump. This is simplified with bolt-on brackets that utilize your Chevy's bed bolt, the bolt that secures your truck bed to your frame. Mounting your Titanium Series lift pump takes only minutes, and all brackets are made from machined steel for superior support and strength.