
If you're looking to install a 20-gallon fuel tank, there are a few options available to you. You can purchase a 20-gallon fuel tank from various online retailers, such as Amazon or ATTA Tank, which offers a DOT Legal Transfer Tank that can be used with diesel, gasoline, kerosene, and other fuels. Elite Truck also offers an RDS 20-gallon auxiliary fuel tank that meets DOT standards and is suitable for industrial use. If you own a Jeep Wrangler, you may also be interested in a fuel pump replacement mod that involves installing a 20-gallon fuel pump/sending unit assembly, which has been reported to fix issues with the fuel gauge. It is important to note that basic mechanical skills are required for installation, and improper installation may void the warranty.
| Characteristics | Values |
|---|---|
| Product Name | RDS 20 Gallon Bright Aluminum Mill Finish Auxiliary Fuel Tank |
| Model Number | 72587 |
| Use | Industrial |
| Finish | Scratches from fabrication process |
| Design | Feed the main fuel tank |
| Features | Lockable fuel cap, drain fitting, withdraw fitting, safety vent, fuel level gauge, internal baffles to reduce sloshing |
| Compliance | Meets DOT standards |
| User Responsibility | Comply with local, state, and federal requirements for transportation, loading, and discharging |
| Kit | Diesel Gravity Feed Install Kit |
| Compatible Vehicles | Ford (1999-Current), Chevy/GMC (2011-Current), Dodge (1999-2012), Nissan Titan XD (2016-Current) |
| Installation | Comes with all components needed for installation |
| Support | Phone support available for installation |
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What You'll Learn
- The Freedom Fill Auxiliary System can be installed by anyone with basic mechanical skills
- The RDS 20-gallon auxiliary fuel tank meets DOT standards
- The RDS tank is designed to feed the main fuel tank
- The RDS tank comes with a lockable fuel cap, drain fitting, safety vent, and fuel level gauge
- The ATTA 20-gallon transfer tank is DOT-legal for use with diesel, gasoline, kerosene, and aviation fuel

The Freedom Fill Auxiliary System can be installed by anyone with basic mechanical skills
The Freedom Fill Auxiliary System is a convenient way to manage your fuel tank. The system senses when the factory tank is at approximately half a tank and turns on the auxiliary in-line pump, filling the factory tank to around three-quarters full. The pump then turns off. This system can be installed by anyone with basic mechanical skills and comes with all the components needed to install the aluminium auxiliary fuel tank to your truck.
The installation kit includes a controller box, an auxiliary tank, a pump, and a computer module with a wiring harness. The first step is to secure the transfer pump inside the toolbox. The Fill-Rite 12V 15GPM Transfer Pump is recommended for this, but it is sold separately. The next step is to ensure that the wiring is connected correctly. The negative wire of the pump should be connected to the black wire of the Freedom Fill Computer module, and the white wire from the Freedom Fill Switch should be connected to the positive side of the pump. The brown wire should have a proper 12-volt ignition power source. The blue wire should be connected to the correct factory sending unit wire.
It is important to note that there can be slight variations in the Freedom Fill System depending on the truck. As a result, the pump may turn on just above or below the half-tank mark, and it may shut off just below or above the three-quarters mark. The system will not turn on if the auxiliary tank is empty. When the truck or system is first turned on, the pump light will turn on for approximately five seconds and then turn off.
If you encounter any issues during the installation process, you can refer to the troubleshooting guide or contact customer support for assistance. It is recommended to use only the parts supplied with the Freedom Fill Installation Kit as substituted parts may not work. Additionally, the warranty will not be honoured if the tank failure is due to improper installation.
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The RDS 20-gallon auxiliary fuel tank meets DOT standards
The RDS auxiliary fuel tank comes with everything you need for a successful installation, including a manual sight gauge, fuel filler shroud, drain fittings, and internal baffles to reduce sloshing. The included toolbox secures the fuel fill to prevent tampering and includes two lift cylinders to hold open the crowned lid. The RDS diesel install kit is sold separately and is necessary for the proper installation and use of the tank.
It's important to note that this tank is not intended for use with gasoline. It is designed for exterior areas and can be used for a variety of applications, including boats, generators, pressure washers, or other specialty applications. The tank meets DOT standards, ensuring its safety and reliability.
When installing a 20-gallon fuel tank, it is important to follow the instructions specific to your tank and vehicle. The Freedom Fill Auxiliary System, for example, can be installed by anyone with basic mechanical skills. However, improper installation may void the warranty, so it is always recommended to seek professional assistance if you are unsure.
Overall, the RDS 20-gallon auxiliary fuel tank is a reliable and safe option for those looking to increase their vehicle's fuel capacity and driving range while meeting DOT standards.
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The RDS tank is designed to feed the main fuel tank
RDS tanks are designed to be supplementary fuel tanks for trucks, RVs, expedition vehicles, boats, and heavy equipment. They can be used to transfer or transport fuel, oil, and other fluids. The tanks are available in rectangular and L-shaped variants, with capacities ranging from 14 to over 200 gallons.
The installation process for an RDS tank can be challenging due to the width of the tank and the clearances needed for the fittings. The drain is typically located on the right side of the tank, while the fuel fill is on the left. A fuel filter and a ball valve can also be incorporated into the system at the drain point on the tank.
RDS tanks are designed for hassle-free bolt-on mounting, utilizing existing holes and hardware. They come with all the necessary parts, such as extended filler necks, trays, and sending units, ensuring a quick, simple, and leak-free installation. The company also provides comprehensive instructions and support to guide customers through each step of the installation process.
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$194.3 $240.62

The RDS tank comes with a lockable fuel cap, drain fitting, safety vent, and fuel level gauge
The RDS 20-gallon auxiliary fuel tank is a durable and feature-rich option for those seeking additional fuel capacity. This tank is constructed with care, using .090" thick aluminium, ensuring its durability and long-lasting performance. One of the standout features of this RDS tank is its lockable fuel cap, which provides added security for your fuel. With this lock in place, you can rest assured that your fuel is protected from potential theft or tampering.
Another notable inclusion is the drain fitting, which allows for convenient and efficient draining of the tank when needed. This feature simplifies the process of emptying the tank, making maintenance and fuel management a more straightforward task. Furthermore, the RDS tank prioritises safety with its safety vent, designed to prevent the buildup of excessive pressure and vapours within the tank. This vent plays a crucial role in maintaining the safety of both the tank and its surroundings.
One of the most important features of any fuel tank is the fuel level gauge, and the RDS tank certainly delivers in this regard. The fuel level gauge provides a clear and accurate indication of the fuel level within the tank, helping you make informed decisions about refuelling and ensuring you're never caught off guard by an empty tank. This visual gauge is easily accessible and provides at-a-glance information about your fuel level, enhancing your overall fuel management capabilities.
Additionally, the RDS tank offers internal baffles that serve a crucial function in reducing fuel sloshing. This feature not only minimises noise but also helps maintain the stability of the fuel, leading to a smoother and more controlled flow. The tank is compatible with diesel fuel and is designed to meet DOT standards, ensuring its safety and reliability. It's important to note that this particular model is not intended for use with gasoline.
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The ATTA 20-gallon transfer tank is DOT-legal for use with diesel, gasoline, kerosene, and aviation fuel
The ATTA 20-gallon transfer tank is a DOT-legal transfer tank and toolbox combination. It is constructed from heavy-duty 1/8" aluminium diamond tread and comes with a locking fuel cap. The ATTA tank has received a Special Permit (#20416) that allows its use with diesel, gasoline, kerosene, methanol, ethanol, and aviation fuel.
To install the ATTA 20-gallon transfer tank, users must follow the provided instructions with no exceptions. This is because failure to adhere to the instructions may void the warranty. The transfer pump, for example, the recommended Fill-Rite 12V 15GPM Transfer Pump, must be installed per the manufacturer's requirements. Additionally, ATTA provides a list of installer locations on its website for customers who need assistance with the installation process.
It is important to note that the Special Permit is only valid for 2.5 years from the date of manufacturing, and refueling tanks must be retested every 2.5 years per 49 CFR 180.352 regulations. The end user is responsible for ensuring compliance with these regulations. Furthermore, ATTA's warranty will not be honoured if the tank failure is due to customer misuse, negligence, improper installation, shipment damage, use of contaminated fuels, or improper fuel additives.
The ATTA 20-gallon transfer tank is a versatile and durable product, covered by a 7-year/unlimited-mile limited liability warranty against defects in material and workmanship. It is suitable for a range of applications, including ATVs, UTVs, lawn services, boats, and generators.
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Frequently asked questions
A 20-gallon fuel tank is used to store and feed fuel into a vehicle.
A 20-gallon fuel tank can be used with diesel, gasoline, kerosene, methanol, ethanol, and aviation fuel.
Some brands that sell 20-gallon fuel tanks include ATTA Tank, RDS, and Elite Truck.
Before installing a 20-gallon fuel tank, ensure that you have the necessary skills and components for installation. Alternatively, you can contact a professional installer or dealer for assistance.
To verify if your 20-gallon fuel tank is installed correctly, check the fuel gauge readings. A correctly installed fuel pump should display accurate fuel levels.










































