Transfer Flow 40 Gallon In-Bed Auxiliary Diesel Fuel Tank System - TRAX 4 (0800116637)
$1,838.95
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Product Information
Transfer Flow 40 Gallon In-Bed Auxiliary (0800116637)
This 40-gallon in-bed auxiliary fuel tank system is a versatile and reliable fuel solution compatible with almost any diesel truck, providing a hassle-free and efficient fuel transfer experience.
Specifications and Design
The fuel tank, rectangular in shape and having a capacity of 40 gallons, is made from 14-gauge ReliaSteel, high-yield aluminized steel, ensuring superior durability and strength. With dimensions of 48 inches in length, 19 inches in width, and 19-3/8 inches in height, the design is compact enough to fit under most standard tonneau bed covers.
Additional Features
The system includes a computer-controlled TRAX 4™ operating system that enables worry-free automatic fuel transfers. Robot-welded seams provide additional strength, making this system more robust than rotationally molded plastic tanks or other steel brands. It also includes all the components needed for installation.
Benefits and Applications
This system is designed to be compatible with almost any diesel truck, including half-ton pickups, trucks with utility beds, Ram Box equipped trucks, or those with a factory installed 5th wheel prep package or other 5th wheel hitch. This nearly universal compatibility makes it a preferred choice for drivers requiring additional fuel capacity but maintaining a small footprint to maximize available bed space. Moreover, the patented fuel tank design and computer-controlled automatic fuel transfers provide a safer and more reliable operation than gravity-fed systems.
Transfer Flow 40 Gallon In-Bed Auxiliary Attributes
- DOT Approved: DOT Approved For Direct Feed Into OEM Fuel Tank
- Tank Capacity: 40 Gallon
- Fuel Type: Diesel
- Shape: Rectangular
- Tank Length (IN): 48 Inch
- Tank Width (IN): 19 Inch
- Tank Height (IN): 19-3/8 Inch
- Tool Box Type: No Tool Box
- Tool Box Length (IN): No Tool Box
- Tool Box Width (IN): No Tool Box
- Tool Box Height (IN): No Tool Box
- Finish: Powder Coated
- Color: Black
- Material: Aluminized Steel
- With Locking Cap: Yes
Offering a 6-year or unlimited-mile warranty, the Transfer Flow 40 Gallon In-Bed Auxiliary system demonstrates confidence in its quality and longevity. With its unique design and superior materials, this system provides an efficient, reliable, and secure solution for your fueling needs, while also being made in the USA.
Note:
If you prefer not to use our TRAX 4™ app with your auxiliary tank but still want to know how much fuel you have, Transfer Flow offers an in-cab fuel level monitor LCD. This item is sold separately.
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Auxiliary Fuel TankManufacturer Docs
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APP AND OPERATING SYSTEM
TRAX 4™
Want to know the status of your on-board fuel systems? Simply download the TRAX 4™ app to your smartphone and enter your vehicle and fuel system information. In no time, you’ll be able to monitor your pickup’s fuel capacity!App Install Details -
Unlimited Mile
6-YEAR WARRANTY
Transfer Flow fuel systems and parts are covered by a six-year unlimited mile warranty against defects in material and workmanship throughout the U.S. and Canada from the unit purchase date by the original purchaser for the original vehicle the unit was installed in.CERTIFICATE OF LIMITED WARRANTY -
Need Help?
Fuel Tank Installers
Transfer Flow has built an extensive network of 196 authorized installers throughout North America, all of which undergo thorough screening and have demonstrated the ability to install multiple fuel systems from each of our main product lines.Installer Map
Transfer Flow Combo
Toolbox & Tanks
Discover the unbeatable versatility and reliability of our all-in-one auxiliary fuel tank and tool box combo, where convenience meets practicality in perfect harmony.

40 Gallon Fuel Tank Tool Box Combo
40 Gallon Fuel Tank Tool Box Combo
When it comes to storage, our combo unit truly shines. With an impressive capacity of 6 cubic feet, you'll have more than enough room to safely stow your belongings. The locking paddle handles provide an extra layer of protection, granting you peace of mind knowing that both your cargo and fuel are secure from any potential risks or intrusions.
Discover the unbeatable versatility and reliability of our all-in-one auxiliary fuel tank and tool box combo, where convenience meets practicality in perfect harmony. Prepare for your journeys with confidence, knowing that you have the ideal solution to fuel your adventures while keeping your valuables safe and sound.

FEATURES
FEATURES
- Recommended for drivers who want extra fuel capacity and a safe place to store their gear
- TRAX 4™ computer-controlled automatic fuel transfers for worry-free operation with exclusive AutoTrans® technology
- Perfect for RVers, contractors, and outdoor enthusiasts
- Comes complete with all components needed for installation
- Built from ReliaSteel®, high-yield U.S. aluminized steel for superior durability and strength
- Powder coated black for a durable satin black finish
- 6 cubic ft. of storage space (Storage dimensions: 59” L × 18” W × 9 3/4” H)
- Gas-filled shocks for easy opening and closing
- Stainless steel locking paddle handles
- Baffled to prevent fuel sloshing
- 6 year, unlimited mile warranty
- Made in the USA