Transfer Flow 0800116637 40 Gallon In-Bed Auxiliary Fuel Tank System w/ Trax 4 | 2008-2024 Ford/Dodge/GM Trucks

Features:

• 40-gallon capacity for extended driving range
• TRAX 4 system automates fuel transfers
• Fits under most standard tonneau covers
• Compatible with 5th wheel prep packages
• Works with utility beds and RamBox setups
• Robot-welded seams for added strength
• Built from American-made aluminized steel
• Baffled design helps reduce fuel sloshing
• Includes all components for easy install
• Fits 2008–2024 Ford, Dodge, and GM trucks
• 6-year, unlimited mile manufacturer warranty
• Made in the USA with quality craftsmanship

Premium Bed Mounted Auxiliary Fuel Tank for Diesel Trucks

If you’re racking up serious miles—whether it’s towing a fifth wheel, hauling gear cross-country, or just putting in long hours on the job—running out of fuel shouldn’t be one of your worries. The Transfer Flow 40-Gallon In-Bed Auxiliary Fuel Tank System with TRAX 4 is built to keep you moving longer, with smart, hands-off fuel management and rugged build quality that stands up to real-world use. This tank is designed to work with a wide range of trucks—from 2008 to 2024 Ford, Dodge/Ram, and GM models—including those with utility beds, RamBoxes, or factory fifth-wheel prep packages. The compact, low-profile design makes it easy to install without losing bed functionality, and it even fits under most standard tonneau covers. That means you don’t have to choose between extra fuel capacity and a secure, weather-tight bed.

TRAX 4 System Automates Fuel Transfer

What really sets this system apart is the TRAX 4™ computer-controlled fuel transfer system. Instead of relying on gravity-fed setups—which can be inconsistent and risky—this system automatically monitors fuel levels and transfers fuel from the auxiliary tank to your main tank while you drive. It’s hands-free, reliable, and a whole lot safer. Once installed, you can forget it’s there—until you realize how much farther you’re going between fill-ups.

High-Quality Construction with Straightforward Install

The tank itself is no slouch either. It’s constructed from high-yield 12- and 14-gauge aluminized steel, sourced and built right here in the USA. The seams are robot-welded for maximum strength, and internal baffles keep fuel from sloshing around during starts, stops, and turns. Everything about the build is focused on durability and longevity, backed by a 6-year, unlimited mile warranty for added peace of mind. Installation is straightforward and everything you need is included right in the box—hardware, wiring, and the TRAX 4 control system. Whether you're outfitting your truck for long hauls, remote job sites, or simply tired of making constant fuel stops, this tank offers a clean, factory-style solution that gives you more range without sacrificing bed space.

Fits:

• 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 Dodge / Ram Cummins
• 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024 Ford Powerstroke
• 2011, 2012, 2013, 2014, 2015, 2016, 2017, 2018, 2019, 2020, 2021, 2022, 2023, 2024, 2025 GM Duramax

Fitment Notes:

• 2010-12 Ram Mega Cab and Crew Cab short bed pickup with single rear wheels require a filler neck (part no. 0500115461).
• 2013-24 Ram Mega Cab and Crew Cab short bed pickups require a mounting bracket kit (part no. 0200116790).

Note: A $350 Shipping Surcharge will be added