Fleece Performance Air and Fuel Delivery

Fleece Performance Engineering: Raising the Bar for Diesel Performance

Founded in 2008 by brothers Brayden and Chase Fleece, Fleece Performance Engineering began with a simple but powerful idea: take the diesel trucks they loved and make them perform better than the factory ever intended. Established in North Salem, Indiana, both founders shared a passion for continuously innovating and improving upon products already on the market. What started in a shop on the family farm has since grown into one of the most respected names in the diesel aftermarket. Today, they operate a full-scale operation that excels in air and fuel-related components for light-duty diesel.

A Culture of Innovation

Fleece Performance Engineering is a leading manufacturer of aftermarket diesel performance products, with a reputation for innovation, quality, and service — pushing the limits of diesel performance technology. Milestone innovations like the Cheetah line of turbochargers, the TapShifter, and the TurboBrake helped cement Fleece's standing as an industry pioneer. Brayden's 2004.5 LLY Duramax became the test bed to develop the TurboBrake and Duramax Cheetah, while Chase's 2002 Cummins was one of the first Cummins pickups to integrate an Allison Transmission. That hands-on, real-world development philosophy still drives every product Fleece brings to market today.

In 2012, Fleece relocated to Nitro Alley in Brownsburg, Indiana, situated among some of the top racing leaders in the world, and in 2014, acquired the area's premier engine machine shop, Freedom Racing Engines, enabling Fleece to expand its engine development program and product offerings. That growth reflects a brand that refuses to stand still.

The Fuel System Experts

At the core of Fleece Performance's catalog is a comprehensive lineup of diesel fuel system components. Their flagship Fuel Lift Pumps — led by the renowned PowerFlo series — address a real vulnerability in modern diesel trucks. Many diesel trucks do not come from the factory with a lift pump supplying fuel to the injection pump, and this added stress on the fuel system can create poor mileage and low power, especially under a loaded situation. The PowerFlo is the latest OEM replacement performance lift pump from the diesel experts at Fleece Performance, and is the only in-tank lift pump capable of supporting up to 800 hp.

For those chasing serious horsepower numbers, Fleece's Fuel Injection Pumps and Diesel Fuel Injector Pumps round out a complete high-performance fuel delivery solution. From high-flow feed lines to the PowerFlo 1000 CP3 Injection Pump capable of supporting up to 1,000+ rear wheel horsepower, Fleece offers the fueling needed for serious builds.

Protecting Your Engine: Coolant Bypass Solutions

Beyond raw power, Fleece Performance takes engine longevity seriously. Their Engine Coolant Bypass Hoses and kits tackle a well-documented weak point in diesel engines like the 6.7L Cummins. The rear cylinders of the 6.7L Cummins suffer from a lack of coolant flow, resulting in higher coolant temperatures that can cause excessive coolant pressure and eventually blow out freeze plugs in the block and head. The Fleece Coolant Bypass Kit addresses this by adding a secondary thermostat that works based on temperature — not pressure — ensuring consistent temperatures across all six cylinders before pressure ever becomes an issue.

Built for Cummins, Duramax & Power Stroke

A healthy fuel system is crucial for your Cummins, Duramax, or Power Stroke's longevity, and from PowerFlo Lift Pumps and SureFlo Sending Units to their lineup of PowerFlo CP3s and upgraded fuel filter assemblies, Fleece's products deliver the quality, reliability, and performance diesel enthusiasts expect. With products available through more than 200 authorized dealers nationwide and a growing online presence, Fleece Performance Engineering continues to be the go-to choice for diesel truck owners who demand more from their machines.