FASS Fuel Systems & Pumps

FASS Fuel System Replacement Parts for Diesel Trucks

FASS stands for Fuel Air Separation System – a design built around one goal: delivering clean and consistent fuel supply to the high-pressure circuit. The complete line of FASS products covers Ford Powerstroke, GM Duramax, and Cummins platforms, each with a dedicated unit engineered for stable fuel delivery under real towing conditions. Whether the truck runs a 7.3 L or a 6.0 L engine, every FASS system addresses the same root issue: inconsistent supply pressure and contaminated diesel reaching the injectors.

Improved Performance with FASS Fuel Lift Pumps

Every FASS fuel air separation unit operates on the same principle: strip out the air, remove the water, and deliver consistent diesel to the CP3 or CP4 inlet while maintaining reliable fuel pressure. Owners on Powerstroke, GM Duramax, and Cummins trucks who want the most from a performance build often upgrade to the FASS Titanium Signature Series fuel lineup – the top-tier option in the product range. On stock trucks, the factory setup runs at marginal pressure under heavy load – a condition that can affect fuel delivery consistency under heavy load and shortens injection component life. A FASS lift pump corrects this by holding stable pressure across the full operating range: at idle, at highway cruise, and under maximum towing demand. The integrated filtration stages also protect the high-pressure circuit from contamination that passes straight through OEM media, supporting reliable fuel delivery every time the engine is under load.

Technical Specifications of FASS Diesel Fuel Pumps

Before selecting a unit, understanding the core specs helps narrow the right choice. The figures below apply across the main FASS diesel fuel configurations in the current catalog, including FASS Titanium Signature Series fuel systems:

• Flow rate: 100–220 GPH depending on series. The 165GPH configuration handles most towing and modified applications; the 100 GPH version suits stock or lightly modified engines.
• Fuel pressure: 16–18 PSI at the CP3/CP4 inlet under load.
• Filtration: 2-micron rated media with integrated water and air separation systems before the stream reaches the high-pressure unit.
• FASS warranty: up to 5 years / 1,000,000 miles on Titanium Series models, depending on application and service history. The extended coverage reflects the durability built into every FASS Titanium Signature Series fuel system.

FASS Fuel Lift Pump Parts & Components

Every FASS pump combines several distinct stages into one compact housing, forming a complete set of filtration systems that protect the engine on every drive. The diesel fuel lift pump design means lift pressure and filtration share a single unit – no separate components required. Each stage filters fuel continuously as the engine runs. Here is what each component handles:

• Lift pump motor – pulls diesel from the tank at controlled pressure, preventing cavitation at the CP4 inlet. Properly maintained, it delivers the performance expected from any FASS Titanium Signature Series fuel system.
• Air separation chamber – removes entrained air and vapor before the stream reaches the engine.
• 2-micron filter element – captures fine contamination that bypasses OEM media, protecting injector tips.
• Water separation stage – extracts moisture from the stream, preventing corrosion inside the diesel injection system.
• Pressure regulator – holds steady PSI output as load and RPM shift across the operating range.

Product Selections: Titanium Series Fuel System & Replacement Filter Options

TheDPFDelete carries three FASS fuel air separation systems product categories. Each is built to deliver the cleanest supply possible to the engine – starting with the Titanium Signature Series Plus at the top of the lineup. The categories can be combined or used individually depending on the truck’s configuration:

• FASS Fuel Pump – the core diesel fuel pump and filtration unit. Compatible with 6.0L and 7.3L platforms among others, it suits owners installing a FASS fuel system for the first time or upgrading from an older unit. Available across the Titanium Signature Series, Titanium Series fuel configurations, and the FASS Drop-in series. Flow options run from 100 to 165GPH and above.
• Filter Replacement Kit – direct replacement for the fuel filter element inside the FASS housing. Filters in the FASS Titanium Signature Series fuel system must be changed on schedule to maintain efficiency. The unit continuously maintains optimal fuel pressure for the diesel injection system; changing the element on schedule maintains separation systems efficiency and protects the CP4.
• Billet Filter Cap – machined aluminum replacement for the OEM plastic housing cap. It is part of the broader filtration systems approach that ensures maximum service life. Eliminates cracking and seal failure common on high-mileage units.

Vehicle Fitment: Ford Powerstroke, GM Duramax, Dodge & Ram Cummins

FASS units cover most diesel truck platforms sold in North America. The list below shows makes, engine displacements, and model years in the TheDPFDelete catalog. Fitment is vehicle-specific – verify your engine code and cab configuration before installing a FASS fuel system:

• Ford Powerstroke: 7.3L (1994–2003), 6.0L (2003–2007), 6.4L (2008–2010), 6.7L (2011–2026) – F-250, F-350, F-450, F-550 Super Duty
• GM / GMC / Chevy Duramax: LB7 6.6L (2001–2004), LLY 6.6L (2004–2005), LBZ 6.6L (2006–2007), LMM 6.6L (2007–2010), LML 6.6L (2011–2016), L5P 6.6L (2017–2026); 6.5L (1992–2000) Suburban, C/K Series
• Dodge Ram Cummins: 5.9L (1989–2007) and 6.7L (2007–2026) – Ram 2500 / 3500

For any platform not listed, contact TheDPFDelete support to confirm availability and authorized service options.

How to Choose a FASS Diesel Fuel Lift Pump for Your Truck

Picking the right FASS lift pump comes down to four variables: platform, power level, climate, and optional add-ons. Whether the truck is a 7.3L or 6.0L Powerstroke, a Duramax, or a Cummins, the process is the same. Work through the steps below:

1. Identify your platform. Confirm make, engine displacement, and model year. A Cummins setup uses different mounting hardware than a Powerstroke or Duramax application. Incorrect hardware selection can create installation and fitment issues.
2. Select the flow rate. Stock builds run well on 100GPH. The FASS adjustable fuel pressure regulator works alongside the lift pump and fuel filtration unit – together they form a complete pump and fuel filtration system that keeps the fuel lift pump and fuel delivery circuit stable at this flow rate. Trucks with injector upgrades, compound turbos, or consistent heavy towing need 165 GPH and above.
3. Choose the series. Each FASS unit system and is a combination of a lift stage and filtration module – the system filters diesel continuously, regardless of which series is selected. The Titanium Signature Series and Titanium Signature Series Plus carry the longest warranty and highest-grade internals. Both the FASS Titanium Signature Series fuel systems and the standard Titanium range suit owners who want proven durability. The Drop-in series suits owners who prefer a self-contained solution without external plumbing changes.

Not sure which unit fits your build? Contact TheDPFDelete support or a certified FASS VIP dealer – the team can confirm fitment and flow requirements for your specific engine.