FASS Fuel Systems & Pumps
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FASS diesel fuel systems for diesel trucks
FASS (Fuel Air Separation System), built on the FASS Titanium Signature Series platform, combines a lift replacement pump with a dual-stage system to replace the factory lift pump assembly. It separates air from vapor, delivering clean, pressurized fuel to the injection system.
Complementary components include fuel pressure regulators or filter caps. FASS products sold by Dieselino support GM Duramax, Ford Powerstroke, RAM Cummins, and Nissan Titan XD Cummins.
Technical specifications and FASS system features
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Advanced Filtration: 2-3-micron rating, which effectively removes fine debris and water contaminants from diesel fuel.
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GPH Flow Rates: available flow rates range from 100 to 290 GPH, accommodating both stock and high-performance builds.
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Mounting: comes with vehicle-specific mounting brackets and allows for direct-fit installation.
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FASS Warranty: all Titanium Series models come with a 5-year/1,000,000-mile warranty.
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Durable Construction: long-term reliability, including heater options for harsh environments.
Collection includes
GM/Chevy Duramax (GMC Sierra/Chevrolet Silverado 2500HD/3500HD)
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2001-2024 LB7/LLY/LBZ/LMM/LML/L5P, 6.6L Duramax FASS Fuel System. High-flow diesel lift pump with 2-micron rating and integrated air/water separation
Dodge RAM Cummins (RAM 2500/3500)
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2007-2022 6.7L Cummins FASS Fuel System (Pump). Built around the FASS Titanium Signature Series platform, the system delivers consistent fuel pressure with multi-stage filtration.
Ford Powerstroke (F250-F550)
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1999-2024 6.0L/6.4L/6.7L/7.3L Powerstroke FASS Fuel System (Pump). FASS lift pump with 100-290 GPH flow options and 2-micron filtration for F-250 through F-550.
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2003-2007 6.0L Powerstroke Fuel Pressure Regulator "Blue Spring" Upgrade Kit. OEM-style "Blue Spring" regulator kit that raises fuel rail pressure by 10-15 PSI to prevent injector wear.
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2008-2010 6.4L Powerstroke Billet Fuel Filter Cap. CNC-machined billet aluminum filter cap with 1/8" NPT port for fuel pressure testing, replacing the factory plastic cap.
Nissan Titan XD Cummins
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2016-2019 5.0L Cummins, Nissan Titan XD FASS Fuel System. Bolt-on FASS lift pump with multi-stage filtration and built-in air separation
How to choose the right FASS fuel pump
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Ensure fitment: the pump should be compatible with your truck's year, make, and engine.
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Determine flow rate: choose a product with a flow rate that suits your driving needs.
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Consider operating conditions: if you plan to drive during winter, select a FASS system with heaters.
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Make room for upgrades: aim for higher GPH to avoid additional costs if you plan to add a turbo or injectors.
- Optional: configure the injector and tuner setup. If you are running a tune or injectors, a higher flow pump can help during heavy throttle or prolonged towing.
FAQs
The fuel GPH should align with your current HP or engine performance and driving needs. If you're a casual diesel vehicle driver, then 100 GPH should be more than enough. But if, for example, you modified your 6.6 Duramax Chevy, 6.7 Powerstroke Ford, or 6.7 Cummins RAM truck for maximum performance (1,000 HP+), then a GPH of 250+ will significantly improve fuel delivery and complement the build.
Yes, by ensuring consistent fuel flow, pressure, and filtration, a FASS pump mitigates risks associated with CP4 injection pump failures, particularly by removing air and contaminants that can cause wear.
FASS fuel filters should generally be changed every 20,000 to 30,000 miles, depending on fuel quality and driving conditions. If you don't drive as regularly, it is recommended to change the FASS filters annually.
Not automatically, as the Magnuson-Moss Warranty Act prevents manufacturers from voiding it unless they prove the FASS system caused it.
No, at least, not always. Excess fuel just returns to the fuel tank ("fuel polishing"), which means installing an oversized pump can make the system much noisier and restrict flow through the fuel lines.
Generally speaking, diesel fuel is not as clean or as consistent and contains air, vapor, water, contaminants, and microscopic debris. A FASS Fuel System, which includes both the fuel lift pump and filter, reducing friction and heat in injectors and pumps. It also helps maintain fuel lubricity by removing entrained air and vapor before the fuel reaches high-pressure components.
When it comes to diesel performance, a FASS fuel system on the truck doesn’t directly add horsepower. But it supports modifications by ensuring consistent fuel delivery and protection under extreme operating conditions, resulting in improved fuel economy and performance in diesel engines.