For truck owners, ranchers, and long-haul travelers, the anxiety of finding the next diesel pump can cut any trip short. An auxiliary diesel fuel tank is the ultimate solution for extending your range, allowing you to cover vast distances without interruption. Whether you’re towing heavy loads through remote areas or simply want to reduce your refueling stops, a larger fuel capacity provides unparalleled freedom and convenience.
Choosing the right auxiliary tank involves considering your vehicle’s make and model, the desired fuel capacity, and the type of installation system. From comprehensive installation kits to large-capacity fuel cells, the market offers options for every need. This roundup highlights some of the best products available to help you conquer the open road with confidence.
Best Auxiliary Diesel Fuel Tanks and Kits
- 11025 1 1/2″ Diesel Installation Kit
- Auxiliary Fuel Tank Install Kit Fit for Ford Dodge Ram
- Landrol 58 Gallon Aluminum Fuel Cell Tank
- RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon
- RDS MFG INC 11025 Diesel Install Kit
- Transfer Flow 50-Gallon In-Bed Auxiliary Diesel Fuel Tank
- RDS 60-Gallon Aluminum Auxiliary Diesel Fuel Tank
- Titan 50-Gallon Replacement Diesel Fuel Tank for Ford
11025 1 1/2″ Diesel Installation Kit
This installation kit is specifically engineered for diesel applications, ensuring compatibility and safe operation. It is designed to work with gravity-fed auxiliary fuel systems and is tailored for vehicles with a 1½” fill line. The kit includes fittings for a 3/8-inch female pipe thread drain, making the connection process straightforward.
Vehicle compatibility is a key strength of this kit. It is confirmed to work with Ford and Dodge models from 2012 and older, as well as Chevy and GMC trucks from 2011 and newer. This makes it a versatile choice for owners of popular diesel pickup trucks who are looking to add an auxiliary tank without complex modifications.
Auxiliary Fuel Tank Install Kit Fit for Ford Dodge Ram
This kit serves as a reliable replacement for part number 11025, providing a steady supply of fuel via gravity feed to maintain the fuel level in your main tank. The components are constructed from high-quality materials that resist corrosion, which is essential for long-term durability and consistent performance in various weather conditions.
Its broad compatibility covers a wide range of modern heavy-duty trucks, including 1999-2022 Ford Super Duty models, Dodge and Ram 2500/3500s from 1999-2012, and Chevy Silverado and GMC Sierra HD models from 2011-2022. Before purchasing, it is recommended to verify your vehicle’s OEM part number to ensure a perfect fit.
Landrol 58 Gallon Aluminum Fuel Cell Tank
For those requiring significant extra range, the Landrol 58-gallon fuel cell offers a substantial capacity of 220 liters. Its rectangular shape, measuring 59″L x 13″W x 17″H, is designed to fit efficiently in truck beds or other designated spaces for transportation and storage needs.
Constructed from aluminum, this tank provides an excellent balance of strength and relatively light weight. The material is also known for being easy to clean and maintain. This large-capacity tank is well-suited for extended work trips, agricultural use, or long-distance travel where fuel stations are sparse.
RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon
RDS Manufacturing is a trusted name in fuel systems, and this 69-gallon rectangular tank exemplifies their commitment to providing options for various needs. With package dimensions of 57″L x 18″W x 16″H, it offers one of the largest capacities available in an auxiliary tank format, ideal for maximizing time between fill-ups.
A notable feature of this tank is its flexibility; while intended for diesel, it can also be used for gasoline if the fuel is siphoned from the top using an electric fuel pump. This versatility can be a major advantage for users who operate different types of machinery or vehicles.
RDS MFG INC 11025 Diesel Install Kit
This is the original RDS diesel installation kit, a benchmark in the industry for setting up a gravity-fed auxiliary fuel system. It contains all the necessary components to safely and efficiently connect an auxiliary tank to your vehicle’s main fuel system, simplifying what can otherwise be a complex project.
As part of RDS’s full assortment of fuel system components, this kit is built to last and integrate seamlessly with their tanks and other products. It is designed specifically for diesel applications, ensuring that all materials are suitable for contact with diesel fuel over the long term.
Transfer Flow 50-Gallon In-Bed Auxiliary Diesel Fuel Tank
Transfer Flow is another industry leader known for its high-quality, DOT-compliant fuel tanks. This 50-gallon in-bed tank is engineered to fit securely in the bed of a pickup truck, providing a robust and integrated solution for extending your vehicle’s range. These tanks are often constructed from aluminized steel or aluminum for durability.
In-bed tanks are a popular choice because they are generally easier to install than replacement tanks and keep the fuel weight low and centered. This model from Transfer Flow is likely to include features like a locking cap for security and baffles to prevent fuel sloshing, contributing to a safer and more reliable driving experience.
RDS 60-Gallon Aluminum Auxiliary Diesel Fuel Tank
This 60-gallon aluminum tank from RDS offers a great middle-ground capacity, providing a major range extension without occupying as much space as the larger 69-gallon model. Aluminum construction makes it resistant to rust and corrosion, which is crucial for a component that will be exposed to the elements in a truck bed.
The tank is designed with a practical rectangular shape to maximize usable space. Like other RDS products, it is built to meet high standards and is compatible with various installation kits for a complete fuel system upgrade. This tank is an excellent option for users who need substantial extra fuel but have limited space.
Titan 50-Gallon Replacement Diesel Fuel Tank for Ford Super Duty
Titan specializes in manufacturing replacement fuel tanks that offer increased capacity over the factory-installed units. This 50-gallon tank is designed to directly replace the stock tank on Ford Super Duty trucks, providing a clean, OEM-style look while significantly boosting fuel capacity.
The main benefit of a replacement tank is that it maintains the vehicle’s original departure angle and ground clearance, which can be important for off-road driving. By fitting in the factory location, it also frees up the truck bed for other cargo. This is a premium solution for Ford owners seeking a seamless and permanent range extension.
Buying Guide: How to Choose an Auxiliary Diesel Fuel Tank
When I started looking into extending the range of my truck, I quickly realized that not all auxiliary diesel fuel tanks are created equal. It’s more than just buying a bigger box to hold more fuel; you need to think about how it integrates with your vehicle and your lifestyle. Getting this decision right saves you a lot of headaches down the road.
The first thing I consider is the tank’s material. You’ll mainly find aluminum, steel, and polyethylene plastic. Aluminum is a fantastic choice because it’s lightweight and resists corrosion, which is a big deal if you live in a place where they salt the roads. Steel is incredibly durable and strong, but it can be heavy and might rust over time if not properly coated. Polyethylene tanks are tough, won’t rust or corrode, and are often a more budget-friendly option. Think about your environment and what you’re using the truck for to pick the best material for you.
Next up is capacity and placement. How much extra range do you actually need? Tanks can range from adding 20 gallons to well over 100. Be realistic about your needs, as a bigger tank means more weight and less payload for other gear. Placement is equally critical. The most common spots are in the truck bed, underneath the bed (replacing the spare tire or taking up unused space), or in a tool box combo. An in-bed tank is usually easier to install but takes up cargo space. An under-body tank keeps your bed free but can be a more complex installation and might affect ground clearance.
You also need to decide on the transfer method. How does the fuel get from the auxiliary tank to your main tank? A simple gravity-fed system is straightforward and reliable, but it often requires the auxiliary tank to be mounted higher than the main tank. A transfer pump system, often electric, is more flexible and allows you to move fuel on demand, but it adds complexity and requires wiring. Some advanced systems can even be wired to transfer fuel automatically.
Finally, don’t forget about the legal stuff. Make sure any tank you choose is compliant with regulations, especially concerning emissions and fuel vapor systems. A proper, clean installation is key not just for performance, but for safety. Taking the time to research these factors is the best way to find one of the 8 best auxiliary diesel fuel tanks for extended range that perfectly fits your rig and your adventures.
Frequently Asked Questions
Are auxiliary diesel fuel tanks difficult to install?
Installation difficulty really depends on the type of tank and your mechanical skill level. A basic in-bed tank with a gravity feed can often be installed in an afternoon with common tools. However, an under-body tank or a system requiring an electric transfer pump and complex plumbing is a much bigger job. It might involve drilling, welding, and wiring. If you’re not completely confident, I always recommend having a professional handle the installation, especially for anything that involves your vehicle’s fuel lines or electrical system.
Is it legal to have an auxiliary fuel tank on my truck?
In most places, yes, but there are important regulations you must follow. These often relate to safety and emissions. For instance, some states have specific rules about how fuel can be transferred to the main tank to prevent vapor release. It’s your responsibility to check your local and state laws before you buy and install a tank. Reputable manufacturers usually design their products to be compliant, but the final installation must also meet code.
How does an auxiliary tank affect my vehicle’s fuel economy?
This is a bit of a double-edged sword. Initially, the added weight of a full auxiliary tank will slightly reduce your miles per gallon. However, the whole point is to drastically increase your total range between fill-ups. For long highway hauls, this means you can maintain a consistent speed for much longer and avoid stopping at expensive or inconvenient fuel stations, which often saves both time and money in the long run.
Can I use an auxiliary tank with a modern diesel engine?
Absolutely. Modern diesel engines can work perfectly with auxiliary tanks. The key is ensuring the transfer system is compatible. You need to be careful not to introduce air into the main fuel system, as this can cause problems. Many newer transfer pump systems are designed with this in mind and provide a smooth, air-free transfer of fuel. Always check that the tank system is recommended for use with your specific truck model and year.
What maintenance does an auxiliary diesel tank require?
Maintenance is generally minimal but important. You should periodically inspect the tank, its mounting hardware, and all hoses and connections for any signs of wear, leaks, or damage. For the tank itself, it’s a good practice to drain and clean it every few years, or if you suspect any water or contaminant buildup, to ensure you’re always putting clean fuel into your main tank. This simple upkeep helps your entire fuel system last longer.