🚀 Just Launched - FASS System Motor Heatsinks

🚀 Just Launched - FASS Drop-In Series Diesel Fuel System for Cummins ISX and X15

Monitor your FASS Fuel Filter Life with FASS Connect!

S&S Diesel · Fuel Systems & Injectors

More Fuel.More Power.Proven.

Race-proven CP3, CP4, and injector upgrades for Cummins, Power Stroke, and Duramax. Built to flow more, hold pressure, and live under load.

Shop S&S Diesel → Shop FASS Fuel Systems

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Your Favorite System Just Got an Upgrade

All PLUS and No Drop Plus systems now come standard with an all-new Heat Sink. This further extends the life of our proven million-mile motor by lowering the internal temperature by up to 20 degrees.

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FASS Motorsports Blog

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Washington, Missouri • Off-Road & Diesel Performance Parts

Built for Trucks That Actually Get Used

FASS Motorsports helps truck, Jeep, and UTV owners dial in suspension, steering, armor, lighting, fuel systems, and diesel performance upgrades that actually fit their build.

01

Suspension & Lift Kits

Shop shocks, coilovers, leveling kits, control arms, leaf springs, and complete lift kits for street, tow, and off-road builds.

02

Diesel Performance

Fuel systems, CP3 and injector upgrades, filtration, drivetrain, and engine parts from S&S Diesel, FASS, and the brands that hold up.

03

Real Fitment Help

Not sure what fits your year, make, and model? Our team helps with truck, Jeep, UTV, and diesel fitment before you order.