
When it comes to RV fuel tanks, there are a variety of options available on the market. While some RVs come equipped with stock fuel tanks, others may opt for aftermarket fuel tanks that offer increased fuel capacity and driving range. These aftermarket tanks can hold up to twice the amount of fuel as the original tank, providing a more efficient solution for long-distance travels. Additionally, companies like Transfer Flow offer replacement tanks for select Ford, GM, Dodge, and Toyota trucks, ensuring a perfect fit without the need for modifications. Made from durable materials like aluminized steel and offering finishes like black powder coating, these tanks are designed to withstand the elements and provide a reliable fuel solution for RV enthusiasts. With the option to choose between undercarriage tanks and in-bed auxiliary tanks, RV owners can decide what best suits their needs and space constraints.
| Characteristics | Values |
|---|---|
| Purpose | Replacing stock fuel tanks with larger fuel tanks to increase driving range and enable longer trips between fill-ups |
| Benefits | More fuel efficiency, reduced need to stop at fuel stations, increased convenience and time savings |
| Manufacturers | Transfer Flow, Standard Technologies, Camping World, etc. |
| Materials | Stainless steel, black powder coating, polymer finish, aluminized steel |
| Vehicle Compatibility | Ford, GM, Dodge, Toyota, Chevy/GMC |
| Installation Options | Auxiliary tanks, in-bed tanks, undercarriage tanks, in-chassis tanks |
| Additional Features | Fuel tank and tool box combos, diesel install kits, transfer pumps |
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What You'll Learn

Benefits of aftermarket fuel tanks
Aftermarket fuel tanks offer a range of benefits, particularly for those who drive long distances or are looking to improve their vehicle's performance. One of the key advantages is the increased fuel capacity, which allows drivers to go further without having to stop frequently for refuelling. This not only saves time but can also be more cost-effective, as drivers can choose to fill up at locations with cheaper fuel prices. For example, a user reported that their aftermarket fuel tank allowed them to drive 700 miles without issue and fill up at their preferred location.
Another benefit of aftermarket fuel tanks is their durability and strength. For instance, Transfer Flow's replacement fuel tanks are made from 12- and 14-gauge aluminized steel, which offers superior durability and strength compared to plastic tanks. Additionally, some aftermarket fuel tanks feature a unique baffle system that helps to eliminate fuel starvation and reduce fuel sloshing during acceleration, braking, and cornering, resulting in a safer and more stable driving experience.
Aftermarket fuel tanks can also provide more interior storage space by relocating the fuel tank from inside the cab to underneath the vehicle. This relocation also helps eliminate gas fumes in the cab, creating a safer and more comfortable environment for drivers and passengers.
Furthermore, some aftermarket fuel tanks come with extended warranties, providing peace of mind and assurance of their quality. For example, Transfer Flow offers a 6-year, unlimited-mile warranty on their replacement fuel tank systems, which are made in the USA with high-quality American-made steel.
Overall, aftermarket fuel tanks offer increased fuel capacity, improved durability, enhanced driving stability, additional storage space, and freedom from frequent fuel stops, making them a valuable upgrade for certain drivers.
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Types of aftermarket fuel tanks
Aftermarket fuel tanks are a great way to increase fuel capacity and reduce the number of fuel stops needed. They are also a good option for those looking for a fuel tank replacement. There are several types of aftermarket fuel tanks available for trucks and cars, with varying capacities and features. Here are some examples:
Transfer Flow Refueling Tank
This is a legal and reliable option for those looking to refuel their pickup trucks on the go. The 40-gallon refueling tank system is Department of Transportation (DOT) certified to carry and transfer gasoline, diesel, and kerosene. It is made from 12-gauge ReliaSteel aluminized steel, offering superior durability and strength. The tank is powder-coated black for a sleek and durable finish. Transfer Flow also offers a 58-gallon replacement fuel tank system that is legal for gasoline in all 50 states.
AFe POWER Large Capacity Fuel Tank
The aFe POWER fuel tank offers a capacity of 52 gallons, significantly more than the standard 30.5-gallon factory tank. It is made from roto-molded LMDPE (Linear Medium Density Polyethylene), a diesel-rated material known for its conformability and stiffness. This tank is stress and crack-resistant and comes with a longer filler neck to reduce fuel foaming. The installation kit includes quality rollover valves, 304 stainless steel mounting brackets, and a fuel sender ring for corrosion resistance.
Zip's 50/50 Split Refueling Tank System
This unique tank system from Zip's features two 50-gallon tanks, allowing for the versatility of carrying two different types of fuel. It is DOT-certified to carry and transfer gasoline, diesel, methanol/ethanol, and kerosene. The tanks are made from 12-gauge ReliaSteel aluminized steel and are powder-coated black for a durable finish. The system includes two 12-volt refueling pumps, two 12-foot hoses, two nozzles, wire harnesses, and mounting hardware.
Aeromotive Direct Fit Fuel Tanks
Aeromotive offers premium-quality fuel tanks that are ideal for modern builds and restorations. Their tanks are known for their durability, performance, and innovation. The Aeromotive lineup includes options for Chevy 1500/2500s, half-ton trucks, and C10 fuel tanks. The tanks have ample capacity and are finished with a silver powder coating for extra protection and aesthetics. Aeromotive's Gen II Stealth Tanks feature a built-in stealth fuel pump, optimizing fuel delivery.
When considering an aftermarket fuel tank, it is important to choose one that is legal, safe, and compatible with your vehicle. These tanks offer increased fuel capacity, durability, and performance, allowing you to maximize your time on the road.
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Manufacturers of aftermarket fuel tanks
When it comes to aftermarket fuel tanks, there are several manufacturers to consider. These companies offer a range of options to meet the diverse needs of vehicle owners, from extended fuel capacity to enhanced durability and stability. Here is a detailed overview of some prominent aftermarket fuel tank manufacturers:
Transfer Flow
Transfer Flow, Inc. is a well-known manufacturer of aftermarket fuel tank systems, established in 1983 by Bill Gaines in Chico, California. Their fuel tanks are crafted from high-quality 12- and 14-gauge aluminized steel, offering superior durability and strength. Transfer Flow's tanks are designed to reduce fuel sloshing during acceleration, braking, and cornering, resulting in a safer and more stable driving experience. Their products are made in the USA and come with a 6-year, unlimited-mile warranty. Transfer Flow offers replacement fuel tanks with capacities ranging from 45 to 58 gallons, providing extended driving ranges and freedom from frequent fuel stops.
Tanks, Inc.
Tanks, Inc. is a manufacturer of replacement fuel tanks for various popular vehicles. They prioritize quality, fit, and finish in their products, utilizing materials such as laser straight die-stamped steel, stainless steel, and roto-mold polyethylene. Tanks, Inc. also specializes in fuel injection-ready tanks, making them a leader in fuel injection conversions. The company is based in Monticello, Iowa, and can be contacted through their toll-free number or local number for inquiries and orders.
Standard Technologies
Standard Technologies caters to the RV and work trailer industry by developing and manufacturing auxiliary fuel tanks for generators and fuel stations. They work closely with their customers to identify the appropriate fuel tank design, focusing on durability, functionality, and value. Standard Technologies utilizes advanced CNC and robotic manufacturing equipment to fabricate fuel tanks that meet their customers' exact specifications. Their fuel tanks are commonly used in various applications, and they strive to optimize efficiency and cost benefits during the development and production process.
Camping World
Camping World is a retailer that offers a range of aftermarket fuel tank options for RVs and pickup trucks. They provide auxiliary tanks, bed boxes, transfer tanks, diesel install kits, and transfer pumps. Camping World's fuel tanks are made of stainless steel or black powder coating, ensuring protection against corrosion, rust, chipping, and abrasion. They cater to various vehicle models, including Ford, Chevy/GMC, and Dodge, and offer free shipping on orders over a certain amount.
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Installation process
The installation process for aftermarket fuel tanks varies depending on the manufacturer and the vehicle. Some manufacturers, like Western Global, provide fuel tanks that arrive ready to install, with a setup process that can be completed in a matter of hours. On the other hand, some manufacturers, like Transfer Flow, offer factory installations at their facility, while also having a network of authorized installers throughout North America.
Step 1: Understand the Installation Requirements
Before beginning the installation, it is crucial to refer to local regulations and carry out risk assessments as recommended by the fuel tank manufacturer and local authorities. This includes considering health and safety risks, environmental impact, and any specific requirements or standards that need to be met, such as US DOT, UL142, and UNIBC approvals.
Step 2: Allocate a Safe Installation Space
Choose a safe and level installation space that is away from potential health and safety risks, residential or office buildings. It is recommended to locate the tank on a paved or asphalt surface to aid in pollution prevention. Ensure that the ground is firm and level to enable safe product usage.
Step 3: Prepare the Necessary Equipment
Have the correct safety response equipment on standby, such as powder, foam, or spill response products like clay covers or absorbent granules. Additionally, ensure that you have the required tools and materials for the installation, such as pumps, gauges, brackets, fittings, and straps.
Step 4: Install the Fuel Tank
The installation process can vary depending on the vehicle and fuel tank design. For example, some tanks are installed from the bottom and held in place by straps, while others may require a support structure to be fabricated. Ensure that the tank is securely installed and follows the manufacturer's instructions or recommendations.
Step 5: Inspect and Test the Fuel Tank
Once the installation is complete, inspect the tank for any signs of damage or issues. If the tank is second-hand, thoroughly inspect it prior to filling it for the first time. Test the tank by adding fuel up to the safe fill level, which is typically around 95% capacity. Ensure that the tank has adequate fuel to prime the pumps and/or feed lines.
Step 6: Maintain and Refuel as Needed
After installation, regular maintenance and refueling will be necessary. Refer to the manufacturer's guidelines and safety refueling instructions to ensure proper and safe usage of the fuel tank.
It is important to note that the above steps provide a general overview of the installation process. For specific instructions, it is always recommended to refer to the fuel tank manufacturer's guidelines and seek professional assistance if needed.
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Cost of aftermarket fuel tanks
The cost of aftermarket fuel tanks varies depending on the manufacturer, the type of vehicle, and the size of the tank. Fuel tanks can range in price from $125 to upwards of $900. For example, a 46-gallon replacement fuel tank system from Transfer Flow for a Toyota Tundra costs $2,298.69. Transfer Flow also offers a 58-gallon replacement fuel tank system for Ford F250, F350, and F450 trucks, which is 50-state legal for gasoline and costs $2,298.69.
Some companies, such as Standard Technologies, work with customers to design and manufacture custom fuel tanks for RVs and work trailers. The cost of these custom fuel tanks is not readily available, but the company mentions that they aim to optimize efficiency and cost benefits during the development and production process, passing the benefits directly to their customers.
It is worth noting that the cost of a fuel tank is not just limited to the purchase price. There may be additional costs for installation, and for RVs or trailers, there may be costs associated with increasing the fuel capacity, such as upgrading the fuel pump or fuel lines.
When considering the cost of an aftermarket fuel tank, it is also important to take into account the potential savings on fuel costs and the convenience of extended driving range. For those who travel frequently or take long trips, having a larger fuel tank can reduce the number of fuel stops, saving time and money.
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Frequently asked questions
An aftermarket fuel tank can be installed in the bed of your pickup. Options include auxiliary tanks that pump fuel directly to your main tank, and refuelers that have their own fueling nozzle. Aftermarket fuel tanks can hold almost twice the amount of fuel as your current tank.
Aftermarket fuel tanks can increase your driving range, enabling you to go further between fill-ups. This can be extremely helpful when going on long adventures, as it is better to have extra fuel on hand than to be stranded on the side of the highway.
There are a few companies that manufacture aftermarket fuel tanks, including Transfer Flow, which is known throughout the country. Standard Technologies also manufactures auxiliary fuel tanks for RVs and work trailers.











































