Long-haul towing, remote off-roading, and extended work trips demand extra fuel capacity. We researched and compared the top extra gas tanks for trucks using manufacturer specifications, industry safety standards, and aggregated owner feedback. Our evaluation focuses on build quality, installation ease, fuel delivery reliability, and compliance with legal requirements. Below are our findings to help you choose the right auxiliary tank for your needs.
| Photo | Product | Score | Buy |
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Transfer Flow 50 Gallon Replacement Fuel Tank Best Overall 50 gallon capacity, replaces factory tank, fits select Ford, Chevy, GMC, Dodge/RAM trucks |
9.2 | 🛒 Check Price |
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Titan Fuel Tanks 55 Gallon Auxiliary Fuel Tank Best Capacity 55 gallon capacity, bed-mounted, includes 12V pump and auto-shutoff nozzle |
8.9 | 🛒 Check Price |
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RDS Manufacturing 30 Gallon Aluminum Fuel Tank Best Lightweight 30 gallon capacity, aluminum construction, bed-mounted, includes 12V pump |
8.6 | 🛒 Check Price |
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Westin 40 Gallon Transfer Tank Best Steel Construction 40 gallon capacity, steel bed-mounted tank, includes pump and nozzle |
8.3 | 🛒 Check Price |
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Scepter 20 Gallon Military Fuel Can Best Portable 20 gallon capacity, portable HDPE can, no pump included |
7.8 | 🛒 Check Price |
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AeroTank 35 Gallon Diesel Transfer Tank Best for Diesel 35 gallon capacity, diesel only, bed-mounted, includes pump and meter |
7.5 | 🛒 Check Price |
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Moeller 12 Gallon Portable Fuel Tank Best Compact 12 gallon capacity, portable HDPE, no pump, includes vented cap |
7.2 | 🛒 Check Price |
1. Transfer Flow 50 Gallon Replacement Fuel Tank: Best Overall
The Transfer Flow 50 Gallon Replacement Fuel Tank is our top pick for truck owners who want the most usable fuel capacity without taking up bed space. In our evaluation, this tank replaces the factory tank and integrates with the vehicle’s fuel system using OEM-grade components. Owner feedback consistently praises the durable steel construction and the fact that it uses the factory mounting points and filler neck. The powder coating resists rust and road debris, and the included sending unit ensures accurate fuel gauge readings. However, installation is involved and may require dropping the existing tank and modifying fuel lines, so we recommend professional installation for most users.
While this tank offers exceptional capacity, it is not a universal fit. It specifically fits select Ford, Chevy, GMC, and RAM trucks; owners of other makes should verify compatibility. Additionally, the tank adds significant weight when full, which may affect payload capacity. For those who need extra range but cannot commit to a replacement tank, consider a bed-mounted auxiliary tank instead. This product is best for truck owners who want a permanent, integrated solution and are willing to invest in professional installation.
- Factory-fit replacement increases capacity without losing bed space
- Heavy-duty steel construction with powder coat finish for corrosion resistance
- Includes all necessary hardware and sending unit for smooth integration
Pros: Maximizes fuel capacity without sacrificing cargo area; High build quality and long-term durability
Cons: Professional installation recommended; not a simple bolt-on for all models
2. Titan Fuel Tanks 55 Gallon Auxiliary Fuel Tank: Best Capacity
The Titan Fuel Tanks 55 Gallon Auxiliary Fuel Tank is a bed-mounted solution for those who need maximum extra capacity. Based on our research, this rotomolded polyethylene tank is UV-stable and built to withstand off-road conditions. The kit includes a 12V pump, auto-shutoff nozzle, and all necessary hoses for transferring fuel to the main tank. Owner feedback highlights the pump’s reliability and the convenience of the automatic shutoff, which prevents overfilling. The tank also meets DOT and EPA requirements for portable fuel containers.
However, this tank occupies a large portion of the truck bed, limiting cargo space. It is also heavy when full, affecting payload. Some owners reported that the pump flow rate is moderate, taking several minutes to transfer 55 gallons. This product is best for truck owners who prioritize range over bed utility and who frequently travel in remote areas where fuel stations are scarce. For those who need bed space, a replacement tank like the Transfer Flow may be a better choice.
- Large 55-gallon capacity for extended range on long hauls
- Includes electric pump with automatic shutoff for safe refueling
- Rotomolded polyethylene construction with UV resistance
Pros: Massive capacity for long-distance towing or remote work; Integrated pump system simplifies transfer to main tank
Cons: Consumes significant bed space; not ideal if bed space is needed
3. RDS Manufacturing 30 Gallon Aluminum Fuel Tank: Best Lightweight
The RDS Manufacturing 30 Gallon Aluminum Fuel Tank is a great middle-ground option for truck owners who want extra fuel without excessive weight. In our evaluation, the aluminum construction offers excellent corrosion resistance and a significant weight savings over steel tanks of similar capacity. The tank includes a 12V pump and hose kit, making transfers straightforward. Owner feedback indicates the pump is reliable and the tank fits well in most truck beds. The tank also features a lockable cap for security.
However, at 30 gallons, this tank provides less range than larger options, and it still takes up bed space. Some users noted that the included pump is not the fastest, but it is adequate for occasional transfers. This product is best for those who need moderate extra capacity for weekend trips or light towing and want to minimize weight impact. If you require maximum range, consider a larger tank.
- Lightweight aluminum reduces added weight compared to steel tanks
- Corrosion-resistant and durable for long-term use
- Includes 12V transfer pump and hose kit for easy refueling
Pros: Lighter than steel tanks, preserving payload capacity; Aluminum resists rust and corrosion
Cons: Smaller capacity than some competitors; not for extreme range needs
4. Westin 40 Gallon Transfer Tank: Best Steel Construction
The Westin 40 Gallon Transfer Tank is a solid steel option for truck owners who need a durable bed-mounted fuel tank. Our research shows that the heavy-gauge steel and powder coat finish provide excellent protection against dents and corrosion. The kit comes with a 12V pump, hose, and auto-shutoff nozzle, and owner feedback indicates the system works well for transferring fuel. The tank is designed to meet DOT and EPA standards, giving added security for legal use.
However, the steel construction adds significant weight, especially when full, which can impact payload. Some users mentioned that the pump is louder than expected. Additionally, the tank takes up bed space. This product is best for those who prioritize tank durability over weight savings and who have sufficient payload capacity. If weight is a concern, consider an aluminum tank.
- Heavy-gauge steel with powder coat finish for durability
- Includes electric pump, hose, and auto-shutoff nozzle
- Meets DOT and EPA requirements for portable fuel tanks
Pros: Sturdy steel construction withstands rough use; Complete kit with pump and nozzle for easy setup
Cons: Heavy when full, reducing payload capacity; Some owners reported pump noise as a minor issue
5. Scepter 20 Gallon Military Fuel Can: Best Portable
The Scepter 20 Gallon Military Fuel Can is a portable option for those who want flexibility and minimal installation. Based on our research, this HDPE can is built to military specifications for durability and leak resistance. It features a strong handle and a spout for pouring directly into the truck’s fuel tank. Owner feedback praises its ruggedness and the fact that it can be used for multiple vehicles or even for storing water. The can is also stackable for compact storage.
However, manually pouring 20 gallons of fuel is physically demanding and increases the risk of spills. The can does not include a pump, so transfers are not as convenient as with a pump-equipped tank. Additionally, the 20-gallon capacity is relatively small for long trips. This product is best for truck owners who need a backup fuel source for emergencies or short extensions and prefer portability over ease of transfer. For regular use, a pump-based tank is recommended.
- Portable design with handles for easy carrying and pouring
- Made from high-density polyethylene (HDPE) with military-grade durability
- Spout included; no electric pump required
Pros: Portable and can be used for other vehicles or equipment; No installation required; easy to store when not in use
Cons: Manual pouring can be messy and slow; Not as convenient as a pump-based system for frequent transfers
6. AeroTank 35 Gallon Diesel Transfer Tank: Best for Diesel
The AeroTank 35 Gallon Diesel Transfer Tank is tailored for diesel truck owners who need a dedicated auxiliary tank. Our evaluation shows that the tank uses diesel-compatible seals and fittings, and the included 12V pump and digital meter allow precise dispensing. The rectangular shape maximizes bed space, and the tank is built from heavy-duty steel. Owner feedback indicates that the pump works well and the meter is helpful for tracking fuel usage.
However, this tank is not suitable for gasoline, limiting its use to diesel trucks. Some users noted that the digital meter can become less accurate over time, requiring recalibration. Additionally, the tank takes up bed space and is heavy when full. This product is best for diesel truck owners who want a dedicated transfer system with fuel monitoring. For gasoline users, consider a universal tank.
- Designed specifically for diesel fuel with appropriate seals and fittings
- Includes 12V pump and digital fuel meter for precise dispensing
- Rectangular shape for efficient bed space usage
Pros: Digital meter allows accurate fuel tracking; Diesel-specific components prevent compatibility issues
Cons: Not suitable for gasoline; limited to diesel trucks only; Some owners reported meter accuracy drift over time
7. Moeller 12 Gallon Portable Fuel Tank: Best Compact
The Moeller 12 Gallon Portable Fuel Tank is a compact and budget-friendly option for truck owners who want a minimal extra fuel supply. In our research, this HDPE tank is lightweight and meets CARB and EPA standards. It features a vented cap and a spout for pouring. Owner feedback appreciates its small size, which allows it to be stored in the bed or even behind the seat of some trucks. It is also easy to carry when empty.
However, 12 gallons is a small amount and will only extend range by about 100 miles for most trucks. Manual pouring is messy and requires caution. This tank is best for emergency situations or for those who only need a small buffer. For serious range extension, a larger tank with a pump is far more practical.
- Compact size fits easily in bed or behind seats
- Lightweight and easy to carry when empty
- Vented cap for safe pouring; meets CARB and EPA requirements
Pros: Very affordable and low-profile; Good for emergency backup or small range extension
Cons: Small capacity limits usefulness for long trips; Manual pouring is inconvenient and spill-prone
Frequently Asked Questions
Is it legal to install an extra gas tank on my truck?
Yes, but regulations vary by location and tank type. In the US, auxiliary fuel tanks must meet DOT and EPA standards. Bed-mounted tanks are generally legal if properly secured and vented. Some states have restrictions on total fuel capacity or require professional installation. Always check local laws before purchasing.
Can I install an extra gas tank myself?
It depends on the type. Portable tanks require no installation. Bed-mounted tanks with pumps involve mounting and wiring, which many DIYers can handle with basic tools. Replacement tanks that integrate with the factory fuel system are more complex and often require professional installation to ensure safety and proper function.
How do I transfer fuel from an auxiliary tank to my main tank?
Most auxiliary tanks include a 12V electric pump that transfers fuel via a hose. Some models have a manual pump or rely on gravity. Always follow the manufacturer’s instructions and use the provided components to avoid leaks or spills.
Will an extra gas tank void my truck's warranty?
An aftermarket fuel tank could potentially void the warranty if it causes damage to the vehicle’s fuel system. However, if installed correctly and without modifying factory components, the Magnuson-Moss Warranty Act protects your warranty for unrelated issues. Check with your dealer or manufacturer for specific policies.
What safety features should I look for in an extra gas tank?
Look for tanks that meet DOT and EPA standards, have secure mounting brackets, leak-proof seals, and venting systems. A rollover valve and anti-siphon features add safety. Electric pumps should have automatic shutoff to prevent overfilling. Steel tanks should be powder-coated to resist rust.
Our Verdict
After researching and comparing the top extra gas tanks for trucks, our top pick is the Transfer Flow 50 Gallon Replacement Fuel Tank for its integrated design, high capacity, and durability. For those who need a bed-mounted option, the Titan Fuel Tanks 55 Gallon Auxiliary Fuel Tank is the runner-up, offering the largest capacity with a convenient pump system. Choose based on your need for bed space versus range and whether you prefer a permanent or portable solution.
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