FASS DIFSHD3001 | Universal HD Fuel Air Separation System

FASS DIFSHD3001 Universal HD Fuel Air Separation System

The FASS DIFSHD3001 Universal Heavy Duty Drop-In Series Fuel Air Separation System is designed for commercial and heavy-duty diesel applications where improved fuel filtration and air/vapor separation are needed without replacing the entire factory fuel system.

The Universal Drop-In Series uses FASS fuel filtration and patented air/vapor separation technology to help remove entrained air, air vapor, water, and particulate contamination from diesel fuel before it reaches the engine's injection system.

The DIFSHD3001 is a universal heavy-duty application, making it suitable for custom installations across a variety of Class 8 and commercial diesel platforms. Applications can include Detroit DD15, Detroit Series 60, Volvo D13, PACCAR MX-13, Cummins ISX, and Cummins X15, provided the vehicle's fuel-system configuration is compatible.

FASS DIFSHD3001 Features

• Brand: FASS Fuel Systems
• Part Number: DIFSHD3001
• Series: Universal Drop-In Series
• Application: Heavy-Duty / Commercial Diesel
• Fuel Type: Diesel
• Filtration: 2 Micron Absolute
• Material: 6061-T6 Billet Aluminum
• Finish: Type 3 Hardcoat Anodized
• Water Separation: Over 99% water removal according to third-party testing cited by FASS
• Motor Life Expectancy: 1,000,000+ miles
• Filter Life Expectancy: Approximately 30,000 miles
• Warranty: Limited Lifetime Warranty with registration
• Manufactured: USA

How the FASS DIFSHD3001 Works

The FASS Drop-In Series is designed to condition fuel before it reaches the engine's injection system. FASS technology separates entrained air and fuel vapor from the diesel fuel while filtering particulate contamination and separating water.

Removing air and vapor from the fuel can help provide more consistent fuel delivery and improve fuel lubricity. FASS states that its air/vapor separation technology can improve fuel lubricity by at least 10% and is designed to help protect injectors and other high-pressure fuel-system components.

The system also uses Mass Flow Return (MFR), which returns unused fuel through the filtration system rather than sending it directly back to the fuel tank. This allows the fuel in the tank to continue being filtered as the system operates.

Heavy-Duty Diesel Applications

The DIFSHD3001 is a universal heavy-duty system intended for commercial diesel applications. Depending on the truck's fuel-system configuration, it can be used with platforms including:

• Detroit Diesel DD15
• Detroit Diesel Series 60
• Volvo D13
• PACCAR MX-13
• Cummins ISX
• Cummins X15
• Other compatible Class 8 and commercial diesel applications

Important: Because DIFSHD3001 is a universal system, these engines should be treated as potential applications rather than guaranteed direct-fit applications. Truck-specific fittings, fuel line connections, mounting locations, or other adaptation components may be required depending on the vehicle.

Universal Drop-In vs. Engine-Specific FASS Systems

The DIFSHD3001 is different from FASS engine-specific Drop-In systems. The universal design gives installers greater flexibility for custom commercial diesel applications, but installation requirements can vary between trucks.

FASS notes that universal commercial Drop-In installations may require additional fittings, fuel line, or minor adaptation components because of differences in truck fuel-system layouts.

FASS Drop-In Fuel System Benefits

• Helps remove entrained air and fuel vapor
• Helps separate water from diesel fuel
• 2-micron absolute particulate filtration
• Helps protect injectors and high-pressure fuel-system components
• Supports improved fuel lubricity
• Mass Flow Return continuously recirculates fuel through filtration
• Heavy-duty billet aluminum construction
• Designed and manufactured in the USA

FASS DIFSHD3001 Fitment Verification

Universal application — verify before ordering. Confirm the truck make, model, engine, existing fuel-system configuration, filter connections, fuel-line size, and available mounting location before purchasing.

The DIFSHD3001 is not an engine-specific bolt-on kit for every DD15, Series 60, Volvo D13, PACCAR MX-13, Cummins ISX, or X15 application. Universal installations may require additional fittings, fuel line, or minor adaptation components.

FASS DIFSHD3001 Warranty

FASS states that the Drop-In Series carries a limited lifetime warranty with registration. Register the system with FASS according to the manufacturer's warranty requirements.