Transfer Flow 0800116637 40 Gallon In-Bed Auxiliary Fuel Tank System with Trax 4 | 2008-2025 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 Ram Box 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 2008–2025 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 2025 Ford, Dodge/Ram, and GM models, including those with utility beds, Ram boxes, 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.

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:

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

Notes:

• Fits 2008–2025 Ford, 2010–2024 Ram, 2011–2025 GM diesel trucks
• Not compatible with gasoline-powered vehicles
• Does not fit 2013–2024 Ram short beds with 5th Wheel Prep
• 2010–2012 Ram short beds may need filler neck #0500115461
• 2013–2025 Ram short beds may need bracket kit #0200116790
• Compact 48" x 19" x 19 3/8" design for bed clearance
• Fits under most standard tonneau covers
• Compatible with RamBox and utility bed setups
• Includes TRAX 4 system for automatic fuel transfers
• Optional in-cab LCD monitor sold separately
• ReliaSteel construction resists rust and road wear
• $350 shipping surcharge applies at checkout