The 40-gallon fuel tank has a small footprint, maximizing bed space, and a compact height for fitting under many popular tonneau covers, according to Transfer Flow.

Check out the new Express-UFS toolbox and 40 gallon fuel tank from Transfer Flow Inc that is perfect for your 4x4 truck when hauling tools or gear. Read more inside Four Wheeler Magazine.

Transfer Flow has primarily been known for its line of auxiliary fuel tanks. This is a company with parts you don't normally think about because they are usually hidden beneath the bed of trucks ...

Transfer Flow’s 100-gallon Hauler fuel tank is an in-bed auxiliary tank designed for use in Ford, GM or Ram diesel pickup trucks to extend fuel capacity and driving range.