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70-Gallon Auxiliary Diesel Fuel Tank System with TRAX 4™

More Fuel. Less Downtime. Maximum Productivity.

Get more done with Transfer Flow's 70-Gallon Auxiliary Diesel Fuel Tank System with TRAX 4™, engineered for work trucks, commercial fleets, contractors, and heavy-duty diesel pickup trucks. This space-saving, in-bed auxiliary fuel tank adds 70 gallons of diesel fuel capacity, helping reduce fuel stops, extend driving range, and keep your truck working longer.

Featuring a redesigned narrow footprint, the tank fits between most full-size pickup truck wheel wells, fits under most tonneau covers, and accommodates many utility, service, and custom truck beds. Whether you're managing a fleet, operating a service truck, or traveling between job sites, this auxiliary diesel fuel tank delivers increased capacity without unnecessarily sacrificing valuable bed space.

Automatic Diesel Fuel Transfers with TRAX 4™

Forget the hassle of manually transferring fuel. Transfer Flow's patented TRAX 4™ Operating System automatically transfers diesel fuel from the auxiliary tank to your truck's main fuel tank while driving.

Unlike traditional gravity-fed auxiliary fuel tanks, TRAX 4™ uses computer-controlled technology to monitor fuel levels in both tanks and automatically transfer fuel at predetermined levels. This helps maintain fuel availability while providing a convenient, controlled transfer process.

The TRAX 4™ mobile app adds another level of convenience, allowing you to monitor fuel levels in both your auxiliary and main fuel tanks directly from your smartphone.

More control. Less downtime. Fewer stops at the pump.

Space-Saving Design Built for Work Trucks

Not every auxiliary fuel tank is designed with commercial truck beds in mind. Transfer Flow's 70-gallon auxiliary diesel fuel tank features a compact, narrow design that maximizes fuel capacity while preserving usable truck bed space.

Its versatile footprint makes it an excellent solution for contractors, fleet operators, service technicians, and truck owners who need additional fuel capacity without compromising the functionality of their truck bed.

Built from high-yield U.S. aluminized steel, the tank offers exceptional strength, durability, and corrosion resistance for demanding work environments. Robot-welded seams provide structural integrity, while internal baffles help minimize fuel sloshing during travel.

Why Choose Transfer Flow's 70-Gallon Auxiliary Diesel Fuel Tank?

• 70 Gallons of Additional Diesel Fuel: Extend driving range and reduce fuel stops during long workdays and extended trips.

• Space-Saving Narrow Design: Fits between most full-size pickup truck wheel wells and accommodates many utility, service, and custom truck beds.

• Tonneau Cover Compatible: Fits under most tonneau covers, helping preserve truck bed functionality.

• TRAX 4™ Automatic Fuel Transfers: Computer-controlled system automatically transfers diesel fuel to your truck's main tank.

• TRAX 4™ Mobile App: Monitor fuel levels in both tanks directly from your smartphone.

• Commercial-Grade Construction: Built from high-yield U.S. aluminized steel for strength and corrosion resistance.

• Robot-Welded Seams: Engineered for durability and long-lasting performance.

• Internal Baffles: Help reduce fuel sloshing while driving.

• Complete Installation Kit: Includes the components necessary for installation.

• Optional Refueling Capability: Add a Refueling Tank Conversion Kit (Part #0200117602) to fuel compatible equipment directly from the auxiliary tank.

• 6-Year, Unlimited-Mile Warranty: Backed by Transfer Flow's commitment to quality.

• Made in the USA: Proudly manufactured using American-made steel.

• Diesel Fuel Only: Designed exclusively for compatible diesel-powered trucks.

Optional Upgrade: Refueling Tank Conversion Kit

Need to fuel equipment in the field while extending your truck's driving range?

Transfer Flow's optional Refueling Tank Conversion Kit (Part #0200117602) adds equipment-refueling capability to your 70-gallon auxiliary diesel fuel tank system while retaining the convenience of TRAX 4™ automatic fuel transfers.

This upgrade allows you to automatically transfer diesel fuel to your truck's main tank and refuel compatible equipment directly from the auxiliary tank.

It's an ideal solution for contractors, fleet operators, service technicians, farmers, and anyone who needs extended driving range and convenient equipment refueling from a single-tank system.

Important Fitment Information:

The optional Refueling Tank Conversion Kit is compatible with long-bed configurations but will NOT fit short-bed configurations of the following trucks:

• Ford F-150

• Chevrolet Silverado 1500 / GMC Sierra 1500

• Ram 1500

• Ford Ranger

Please Note: This restriction applies only to the optional Refueling Tank Conversion Kit, not the 70-Gallon Auxiliary Diesel Fuel Tank System itself. The auxiliary tank remains compatible with applicable short-bed and long-bed configurations of these trucks.

Frequently Asked Questions

What is the purpose of an auxiliary diesel fuel tank?

An auxiliary diesel fuel tank increases the amount of fuel a truck can carry, helping extend driving range and reduce the frequency of fuel stops. Transfer Flow's 70-gallon auxiliary tank adds 70 gallons of diesel fuel capacity to compatible trucks.

How does the TRAX 4™ automatic fuel transfer system work?

TRAX 4™ continuously monitors the fuel levels in your truck's main tank and auxiliary tank. While the vehicle is operating, the computer-controlled system automatically transfers diesel fuel from the auxiliary tank to the main tank at predetermined levels.

Does the 70-gallon auxiliary fuel tank fit under a tonneau cover?

Yes. Transfer Flow's narrow-profile 70-gallon auxiliary diesel fuel tank is designed to fit under most tonneau covers. Actual fit depends on your truck bed configuration and tonneau cover design.

Can I monitor the fuel levels from my phone?

Yes. The TRAX 4™ mobile app allows you to monitor the fuel levels in both your auxiliary and main fuel tanks from a compatible smartphone.

Can this auxiliary tank be used to refuel equipment?

Yes, with the optional Refueling Tank Conversion Kit (Part #0200117602). This upgrade adds the ability to refuel compatible diesel-powered equipment directly from the auxiliary tank while retaining TRAX 4™ automatic transfers.

Can this tank be used with gasoline?

No. This 70-gallon auxiliary fuel tank system is designed for compatible diesel-powered trucks and diesel fuel applications only.

Will the Refueling Tank Conversion Kit fit my short-bed truck?

The optional Transfer Flow Refueling Tank Conversion Kit (Part #0200117602) does not fit short-bed Ford F-150, Chevrolet Silverado 1500, GMC Sierra 1500, Ram 1500, or Ford Ranger trucks. However, the kit is compatible with applicable long-bed configurations of these vehicles. This restriction does not affect the fitment of the 70-Gallon Auxiliary Diesel Fuel Tank System with TRAX 4™ itself.