The combo tank features a 100-gallon steel diesel tank, and an 18-gallon polyurethane DEF tank that can be substituted with a tank and pumping system for engine or hydraulic oil. Both fill nozzles come available in automatic or manual, and are located on the driver side of the truck and extend out 10 feet from the tank. An optional thermostatically controlled DEF heating system is available for use in northern climates that ensures the temperature of the DEF tank, pumps and hoses does not dip below 25 degrees Fahrenheit. The 12V Webasto heating system is entirely self-contained and runs off diesel from the tank.
Diesel is pumped at 15 gallons per minute via an industrial-grade 12V pump, while DEF is pumped at up to 10 GPM. Thunder Creek’s proprietary 2-in-1 DEF pumping solution, which pumps DEF in and out of the tank via a closed system to ensure fluid quality, is also available as an option. The entire transfer tank and all of its components are concealed within a lockable, weather-sealed enclosure, and comes with diamond plate aluminum doors as an option.