Product Overview

FASS Titanium Signature Series PLUS Fuel System for 2020–2023 GMC/Chevrolet Duramax 6.6L

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Important: This fuel system requires compatible aftermarket tuning before it can be used with the vehicle.

Upgrade your 2020–2023 GMC or Chevrolet 6.6L Duramax with the FASS Titanium Signature Series PLUS Fuel System. Designed for stock and modified diesel trucks, this system delivers a consistent supply of clean, properly conditioned fuel to help protect the injection system and support dependable engine performance.

The Titanium Signature Series PLUS removes water, fine debris, air, and vapor before diesel fuel reaches the engine. Supplying cleaner and more consistent fuel can help improve combustion, throttle response, fuel-system reliability, fuel efficiency, and cold-weather operation.

This PLUS configuration includes upgraded black-anodized ORB fittings at the filter base and black-anodized AN-style fittings throughout the system. These upgraded connections provide secure fuel-system connections while adding a durable, clean-looking finish.

Fuel Delivery, Protection, and Performance

• Supports Stock and Modified Duramax Engines: Available flow configurations provide dependable fuel delivery for factory and high-performance 6.6L Duramax applications.
• Injection-System Protection: Cleaner diesel fuel helps reduce wear on injectors, pumps, and other costly fuel-system components.
• Improved Combustion: Removing water, debris, air, and vapor supports more complete and consistent combustion.
• Performance Support: Properly conditioned fuel can help improve throttle response, fuel atomization, horsepower, and overall engine operation.
• Limited Lifetime Warranty: Warranty coverage is available after the FASS system is properly registered.

Advanced Filtration Technology

FASS systems do more than transfer diesel fuel. They continuously filter and condition it before it reaches the high-pressure injection system.

• Water Separation: Third-party testing verifies removal of more than 99% of water from diesel fuel.
• Air and Vapor Removal: The patented FASS process removes entrained air and vapor that may reduce efficiency and contribute to injection-system wear.
• 2-Micron Absolute Microglass Filtration: Captures extremely fine debris that may pass through standard OEM filtration.
• Mass Flow Return: Unused fuel is continuously circulated back through the filters, helping keep the tank supply clean and conditioned.

Key Benefits

• Improved Reliability: Cleaner diesel fuel helps extend the service life of injectors and other injection-system components.
• Stronger Engine Response: Consistent fuel delivery supports improved throttle response, fuel atomization, and injection timing.
• Fuel-Economy Potential: More efficient combustion may contribute to improved fuel economy. Results vary by vehicle, condition, modifications, tuning, and driving habits.
• Additional Contamination Protection: The Extreme Water Separator provides an added safeguard against severely contaminated fuel.
• Cold-Weather Confidence: Supports dependable starting and operation in low temperatures, especially when paired with the appropriate FASS Fuel Heater.
• Proven Durability: FASS reports a fuel-system failure rate below 0.5%.
• Cleaner Engine Operation: Improved fuel quality and combustion may help reduce soot output and DPF regeneration frequency.
• Improved Fuel Lubricity: The FASS conditioning process can increase diesel-fuel lubricity by at least 10%.

Key Features

• Fuel Flow: Supports stock and modified 6.6L Duramax engines producing up to 1,200 horsepower, depending on the selected configuration.
• Filtration Rating: 2-micron absolute microglass filtration captures finer debris than standard OEM filters.
• Water Removal: Removes more than 99% of water from diesel fuel based on third-party testing.
• Patented Air and Vapor Removal: Conditions fuel before it reaches the engine.
• Motor Life: Designed for more than 1,000,000 miles of operation.
• Filter Life Expectancy: Up to 30,000 miles under normal operating conditions.
• Warranty: Limited Lifetime Warranty with registration.
• Fuel-Heater Compatibility: Optional electric FASS fuel-heater kits are available.
• Mass Flow Return: Continuously filters and circulates unused fuel for maximum cleanliness.
• Whisper Technology: Designed for quieter motor operation.
• Performance Radius Cuts: Smooth internal passages help reduce sharp restrictions and promote consistent fuel flow.
• Heavy-Duty Mounting Hardware: Includes durable bolt-on steel mounting brackets.
• Upgraded PLUS Fittings: Includes black-anodized ORB fittings at the filter base and black-anodized AN-style fittings throughout the system.
• Aluminum Motor Heat Sink: The black-anodized aluminum heat sink can lower internal motor temperature by as much as 20°F, helping support longer motor life while adding a clean, upgraded appearance.

Important Tuning Requirement

This fuel system is not intended to operate on the factory calibration alone. Compatible aftermarket tuning is required for proper installation and operation on 2020–2023 GMC and Chevrolet 6.6L Duramax applications.

Confirm tuning compatibility, installation requirements, and vehicle fitment before ordering or beginning installation.

Why Choose the FASS Titanium Signature Series PLUS?

The FASS Titanium Signature Series PLUS is designed for Duramax owners who want advanced filtration, dependable fuel delivery, upgraded fittings, and long-term injection-system protection.

Whether your GMC or Chevrolet is used for daily driving, towing, commercial work, or a performance build, this system provides the clean and consistent fuel supply needed to support reliable operation.