Transfer Flow 0800116637 40-Gallon In-Bed Auxiliary Diesel Fuel Tank System with TRAX 4

The Transfer Flow 0800116637 is a 40-gallon in-bed auxiliary diesel fuel tank system powered by the patented TRAX 4™ operating system, offering computer-controlled automatic fuel transfers for a worry-free extended driving range. Designed to be one of the most universally compatible auxiliary tanks available, this system fits half-ton pickups, trucks with utility beds, RamBox-equipped models, and vehicles with a factory-installed 5th-wheel prep package or other 5th-wheel hitch.

The low-profile design allows the tank to fit seamlessly under most standard hard and soft tonneau covers, keeping bed space free for cargo and gear. Its robot-welded seams and construction from 12- and 14-gauge ReliaSteel® high-yield U.S. aluminized steel, powder coated black, deliver superior corrosion resistance and long-term durability — far exceeding rotationally molded plastic tanks.

Key Features:

• 40-gallon capacity — significantly extends driving range on long hauls, RV trips, off-road adventures, and worksite commutes
• TRAX 4™ computer-controlled AutoTrans® technology — automatically transfers fuel from the auxiliary tank to your main tank at predetermined fuel levels while the vehicle is in operation, no manual effort required
• TRAX 4™ smartphone app compatible — monitor real-time fuel levels (gallons or percentage) in both main and auxiliary tanks, receive distance-to-empty alerts, and track transfer activity from your phone
• Optional in-cab LCD fuel level monitor — displays auxiliary tank fuel level via an easy-to-read bar graph (sold separately)
• Built from ReliaSteel® U.S. aluminized steel with internal baffles for added strength and durability
• Powder coated black for superior corrosion resistance and a durable satin finish
• Low-profile design fits under most standard tonneau covers
• Compatible with most 5th-wheel hitches and RamBox-equipped trucks
• Comes complete with all components needed for installation
• Made in the USA

Dimensions: 48" L × 19" W × 19.38" H (dimensions include 1.5" added to width for mounting brackets and 3" added to height for filler neck). Weight: 52 lbs.

Note: This system requires the TRAX 4™ module for full operation. An optional in-cab LCD monitor is available separately for those who prefer not to use the smartphone app.