Transfer Flow

Transfer Flow: Over 40 Years of American-Made Fuel Tank Innovation

Founded in 1983 and headquartered in Chico, California, Transfer Flow, Inc. has spent more than four decades earning its reputation as one of North America's most trusted manufacturers of aftermarket fuel tank systems. Every Transfer Flow product is engineered and built in the USA, reflecting the company's unwavering commitment to quality, safety, and domestic craftsmanship.

Built from the Ground Up in the USA

What sets Transfer Flow apart from the competition starts with the materials. Each tank is constructed from high-yield, U.S. aluminized steel — a proprietary material the brand calls ReliaSteel® — with robot-welded seams and internal baffles to reduce fuel slosh during transit. The result is a tank that's engineered to withstand the demands of daily use on work sites, long highway hauls, or backcountry exploration. Every system ships complete with all hardware, wiring harnesses, and illustrated step-by-step installation instructions, so there's no guessing at the parts counter.

The brand's lineup covers three primary product types: in-bed auxiliary tanks, refueling tanks, and high-capacity replacement fuel tanks. Their fuel transfer tanks span a wide range of capacities — from compact 37-gallon options that slip under tonneau covers to massive 109-gallon configurations suited for full-size and heavy-duty trucks. Whether you're a rancher who needs to refuel equipment in the field, an overlander chasing distant trailheads, or a fleet manager looking to reduce downtime at the pump, Transfer Flow has a purpose-built solution.

The TRAX 4™ System: Smart Fuel Management

Transfer Flow's patented TRAX 4™ computer-controlled operating system is a standout feature on their auxiliary tank lineup. The system automatically monitors fuel levels and transfers fuel from the auxiliary tank to the main factory tank while the vehicle is in motion — no manual switching required. Drivers can also pair the system with the TRAX 4 mobile app to monitor both tanks in real time from their smartphone. It's the kind of intelligent engineering that keeps operators focused on the road, not the fuel gauge.

DOT-Legal and CARB-Compliant

Compliance is never an afterthought at Transfer Flow. Their refueling tank systems are DOT-legal for carrying and transferring gasoline, diesel, kerosene, methanol, and ethanol. Gasoline replacement tank systems are built to meet CARB (California Air Resources Board) regulations. This commitment to legal, safe operation has made Transfer Flow a trusted OEM supplier to manufacturers including Ram, Ford, GM, and others in the commercial vehicle space.

Trusted by Enthusiasts and Professionals Alike

With more than 325 authorized installers across the U.S. and Canada, and a network that spans from individual truck owners to major OEM clients, Transfer Flow has built a legacy that resonates across industries. Whether you drive a daily work truck, tow a fifth-wheel trailer, or manage a commercial fleet, Transfer Flow's fuel systems are designed to extend your range, reduce fuel stops, and give you the confidence to go further.