Transfer Flow 70 Gallon In-Bed Auxiliary Diesel Fuel Tank System - TRAX 4 Model 0800117584

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.

Specifications

• Dimensions: 47 7/8" L x 33" W x 17 3/16" H
• Fits: 2008-26 Ford, 2011-26 GM/Chevy, 2010-26 Dodge/Ram
• For Bed Size: Short, Long
• Fuel: Diesel
• Part Number: 0800117584

Order processing times

Most orders will be processed in up to 72 hours. During seasonal times such as Black Friday, order processing time can take up to 5 business days. We appreciate your patience as we prepare your order.

Shipping times 

Shipment dates & lead times will vary based on product availability, product may not be in stock. If you have a question regarding availability please email or call the office to discuss lead times. By completing payment, you have acknowledged the terms and conditions stated. As stock changes daily, we do not hold inventory, first come, first serve.

Currently some brands are experience major delays - contact us or more information.

Local pickup

We currently offer free pickup from our location. You will be notified via email or phone when your item(s) are ready for pickup. 

Returns

We will accept returns within 30 days of original purchase and provide a store credit ONLY, no cash or credit card refunds will be given. All returns are subject to a 20% restocking fee. The product must still be in the original clean packaging, unused and uninstalled. We do not refund shipping and handling charges and the customer is responsible for all return shipping charges. There will be an additional rebox fee charged if the packaging needs to be replaced so please double box your returns. There is no returns of special order, tuners or custom parts.

Cancellations 

Custom parts may not be canceled once your order is placed. Cancelled Orders may be subject to a 15% cancellation fee. All returns must be pre-authorized with a Battle Born Offroad Employee and have an RGA # or they will be returned to you. Refunds will be processed within 48hrs once product is received and in original condition. Most refunds are issued to the original payment method, or by check. Please allow up to 7 business days for store credit to reflect.

Website errors

In the event a product is listed at an incorrect price due to typographical, photographic, or technical error or error in pricing information received from our suppliers, Battle Born Offroad Ltd shall have the right to refuse or cancel any orders placed for product listed at the incorrect price.

Payment processing

By clicking checkout, you agree to have your payment ran anytime after checkout. Some orders may not be charged right away, and you authorize Battle Born Offroad to charge your card up to 365 days after completing your purchase for the maximum amount you paid.

SOME ORDERS DO NOT SHIP RIGHT AWAY

Most Orders will ship within 72hrs. Some parts may not in stock and may incur a 1-52 week time due to limited availability. If you want to check the most up to date lead times on any of these products please email us at info@BattleBornOffroad.net

How can I contact you if I have questions before ordering?
You can call us directly at 702-333-0868, email our support team, or message us on our chat or on social media. We’re here to help you with fitment, installation, and product questions before you commit to a purchase.

Do you price match other retailers?
Yes, we strive to offer the best prices in town. If you find a lower advertised price from an authorized dealer, let us know—we’ll do our best to match or beat it. Some exclusions may apply for clearance or special-order items.

What is your shipping policy and how long will my order take?
We offer free or discounted shipping on most orders over $99. Orders typically ship within 1-3 business days; once shipped, standard transit times depend on your location, but generally most transit time is 2-3 days. Expedited shipping is available at checkout, and offers delivery as quick as 24hrs. Tracking info will be provided once your package is in transit and will be sent electronically to your email. 

Do you offer installation services or do you only sell parts?
Yes, Battle Born Offroad offers professional installation in our Las Vegas shop for ALL products we sell (suspension, lift kits, lighting, etc.). If you’re interested in installation, please hit our live chat button, give us a call at 702-333-0868 or email us to get a quote or get on the schedule. We can assist with shipping your vehicle to us if you are out of state and build trucks from around the country!

What warranty do your products come with?
All of our products come with a manufacturer’s warranty covering defects in materials and workmanship. Warranty durations vary by product and brand. Damage from misuse, improper installation, or off-trail abuse may not be covered. To initiate a claim or have questions, please reach out to us via email at info@battlebornoffroad.net and please submit photos, your order number and a brief description of the issue you are facing. 

Do you offer financing or payment plans?
Yes, we partner with financing providers (Affirm, Shop Pay, SNAP Finance & Koalifi) so you can pay over time. Options like “buy now pay later” or longer-term payment plans may be available. Terms and interest will depend on your credit. Affirm and Shop Pay will be shown during checkout and must be clicked during this process. Other options are offered in store or on the phone, please feel free to call us at 702-333-0868 to discuss more. 

How do you handle damages or defects in shipping?
Please inspect your package immediately upon arrival. If you notice any shipping damage, take clear photos of the damage and packaging and email us within 24 hours of delivery. We will work to make it right, either replacement of the part, or arranging return/reimbursement as needed.

Still have a question?
See all our Frequently Asked Questions or contact us with questions.