FASS Drop-In Series Universal HD Fuel Air Separation System for Most Class 8 and Commercial Diesel Engines

Fits: Universal Diesel Applications

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The FASS Drop-In Series Diesel Fuel System was engineered by FASS to be the most cost-effective and easiest solution for removing air vapor and entrained air from diesel fuel. In addition to advanced air separation, this universal system features high-capacity particulate filtration down to 2 micron absolute.

Filters Available Here

By removing entrained air, air vapor, and particulates, the Drop-In Series System protects diesel injection systems from premature failure and can triple the life of your fuel injection system.

Eliminating these contaminants helps optimize MPG (results will vary), restore horsepower, and sharpen throttle response. This universal kit can be adapted to nearly any diesel application.

Reliability. Simplicity. Protection.

• Injector Protection: Triples the life of injectors and injection pumps.
• FASS Filtration: Optimizes combustion, restores horsepower, and maximizes MPG (results vary).
• Limited Lifetime Warranty: Register your FASS system and you’re covered.

Advanced In-Tank Filtration Technology

The FASS Drop-In Series focuses on fuel quality:

• Air & Vapor Removal: Eliminates entrained air and vapor that damage injection systems and reduce efficiency.
• 2 Micron Absolute Filtration (Microglass): Removes debris smaller than OEM filters can capture.

Key Benefits

• Improves Reliability: Triples the injection system life.
• Maximized Horsepower: Improved fuel atomization and restored injection timing for a smoother, more balanced engine.
• Optimized MPG: More efficient and complete combustion (results will vary).
• Extreme Cold Weather Confidence: Reliable starts and operation in harsh climates, especially when paired with the FASS Drop-In Fuel Heater Kit.
• Cleaner Operation: Reduced DPF regenerations and soot output through improved combustion.

Universal Drop-In Series Filtration System Features

This extremely flexible system provides an easy mounting solution with inlet and air separation ports that can be utilized on either side. A single outlet port is located on the top of the filter base.

• 4 × SAE 10 (O-Ring Boss) fuel inlet ports
• 1 × SAE 10 (O-Ring Boss) fuel outlet port
• 2 × 1/4" male JIC air separation ports
• 2 × 1/8-27 NPT fuel inlet pressure ports
• Increases fuel lubricity by at least 10%
• Extends life of fuel injection system components
• 100% drop-in design — no additional modifications required
• Ideal for heavy equipment OEM applications
• Can be used with OEM filtration or as final filtration
• Machined in the USA from 6061-T6 billet aluminum
• Type III hardcoat anodized black for corrosion resistance
• 125 PSI max pressure rating (300 PSI with PF2002)
• 500 GPH maximum flow rate

Why Choose FASS?

At FASS, we design fuel Systems with longevity, reliability, and real-world use in mind. The Drop-In Series is engineered for diesel owners who want proven filtration technology and injector protection — without changing the character of their truck. It’s a smart, dependable upgrade for daily drivers and work trucks alike.

What applications is this system compatible with?

This is a completely universal system, meaning it can be adapted to basically anything with a diesel engine! Whether it is a Class 8 truck, marine application, heavy equipment, defense, farm tractor, lawn mower, and the list goes on! Just about any application that you desire to have superior particulate filtration and removing the air vapor/entrained air.