We researched and compared seven L-shaped fuel tanks designed specifically for short bed trucks to help you find the optimal solution for your auxiliary fuel needs. Our evaluation focused on manufacturer specifications, industry safety standards, and aggregated owner feedback to provide an accurate assessment of each tank’s performance and value.
Based on our analysis of build materials, capacity ratings, mounting systems, and safety features, we’ve identified the strengths and limitations of each option to help you make an informed purchase decision that matches your specific requirements and truck configuration.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
RDS Auxiliary Fuel Tank Best Overall 50-gallon capacity with 14-gauge aluminum construction |
8.9 | 🛒 Check Price |
 |
Transfer Flow L-Shaped Auxiliary Fuel Tank Premium Choice 60-gallon capacity with gravity feed system |
8.2 | 🛒 Check Price |
|
🚗
|
Dee Zee L-Shaped Auxiliary Fuel Tank Best Value 45-gallon capacity with powder-coated steel |
7.8 | 🛒 Check Price |
 |
Titan Fuel Tanks L-Shaped Auxiliary Tank Most Durable 55-gallon capacity with military-grade polymer |
7.5 | 🛒 Check Price |
 |
Better Built L-Shape Auxiliary Fuel Tank Budget Friendly 40-gallon capacity with aluminum construction |
7.2 | 🛒 Check Price |
|
🚗
|
WeatherTech L-Shaped Fuel Tank Versatile Option 35-gallon capacity with modular design |
6.9 | 🛒 Check Price |
|
🚗
|
S&B Tanks L-Shaped Auxiliary Fuel System Specialized Use 30-gallon capacity with integrated pump system |
6.6 | 🛒 Check Price |
1. RDS Auxiliary Fuel Tank: Best Overall
In our evaluation, the RDS Auxiliary Fuel Tank demonstrated superior construction quality with its 14-gauge aluminum build that resists corrosion and withstands rough road conditions. The L-shaped design is particularly effective for short bed trucks, utilizing space efficiently while maintaining accessibility to your truck bed. Based on manufacturer specifications, this tank provides 50 gallons of additional fuel capacity, significantly extending your driving range between fill-ups.
The tank features a baffled design to minimize fuel sloshing during transit, though some owner feedback indicates that the included instructions could be more detailed for first-time installers. We recommend this tank primarily for truck owners who regularly travel long distances or work in remote areas where fuel stations are scarce. If you rarely exceed your standard tank’s range or have minimal mechanical experience, the installation requirements may outweigh the benefits for your use case.
- L-shaped design maximizes short bed space efficiency
- Includes mounting kit and rollover valve
- Compatible with most fuel systems
Pros: Excellent build quality with thick aluminum construction; Well-designed mounting system fits most truck beds
Cons: Installation requires mechanical knowledge and tools; Limited color options available
2. Transfer Flow L-Shaped Auxiliary Fuel Tank: Premium Choice
Based on our research, the Transfer Flow tank offers impressive capacity with its 60-gallon design, making it ideal for those requiring maximum fuel storage in a compact footprint. The gravity feed system is a standout feature that eliminates the need for electric pumps, reducing potential failure points in the fuel delivery system. According to manufacturer specifications, the tank is constructed from heavy-duty aluminum that resists rust and corrosion.
Owner feedback indicates that while the tank performs exceptionally well once installed, the setup process can be challenging for those without mechanical experience. The tank’s weight when full is substantial, which may affect payload capacity for some truck owners. We recommend this tank primarily for serious overlanders or contractors who consistently operate in remote locations and have the mechanical skills or resources to complete the installation properly.
- Gravity feed system eliminates need for pumps
- Includes all necessary hardware for installation
- Designed specifically for short bed trucks
Pros: High-capacity design extends range significantly; Quality construction with durable materials
Cons: Higher cost compared to similar options; Installation more complex than simpler models
3. Dee Zee L-Shaped Auxiliary Fuel Tank: Best Value
The Dee Zee L-Shaped Auxiliary Fuel Tank offers a solid balance of capacity and affordability in our evaluation. With 45 gallons of additional fuel storage, this tank provides significant range extension without the premium pricing of some competitors. The powder-coated steel construction offers good durability, though it is notably heavier than aluminum alternatives, which may impact overall payload capacity.
Based on aggregated owner feedback, the installation process is relatively straightforward for those with basic mechanical skills, though some users reported minor fitment issues with certain truck models. The locking gas cap is a valuable security feature, though several owners mentioned concerns about long-term paint durability, particularly in regions with harsh winters and road salt exposure. We recommend this tank for budget-conscious buyers who prioritize capacity over weight savings.
- Powder-coated steel provides enhanced durability
- Includes locking gas cap for security
- Designed for easy installation with common tools
Pros: Good balance of capacity and affordability; Durable powder-coated finish resists weathering
Cons: Steel construction heavier than aluminum alternatives; Some reports of paint chipping over time
4. Titan Fuel Tanks L-Shaped Auxiliary Tank: Most Durable
In our research, the Titan Fuel Tanks option stands out for its unique military-grade polymer construction, which offers exceptional resistance to corrosion and dents compared to metal alternatives. The 55-gallon capacity provides substantial range extension while the one-piece design eliminates the seam-related leak points that can affect metal tanks. According to manufacturer specifications, the specialized polymer material is significantly lighter than aluminum or steel alternatives.
Owner feedback indicates that while the tank performs exceptionally well in terms of durability and weight savings, the premium price point may be difficult to justify for occasional users. The specialized mounting system, while secure, requires precise installation which some users found challenging without professional assistance. We recommend this tank primarily for extreme off-road enthusiasts or commercial users who operate in corrosive environments where traditional metal tanks might deteriorate more quickly.
- Military-grade polymer construction resists corrosion
- One-piece design eliminates potential leak points
- Includes specialized mounting hardware
Pros: Extremely durable material that won't rust or corrode; Lighter weight than metal alternatives
Cons: Significantly higher cost than most competitors; Limited availability for some truck models
5. Better Built L-Shape Auxiliary Fuel Tank: Budget Friendly
The Better Built L-Shape Auxiliary Fuel Tank represents an accessible entry point into auxiliary fuel storage with its modest 40-gallon capacity and budget-friendly price point. In our evaluation, the tank’s compact L-shaped design effectively utilizes limited short bed space while preserving access to other bed functions. The aluminum construction provides adequate corrosion resistance for most environments, though the material gauge is thinner than premium options.
Based on owner feedback, the installation process is relatively straightforward, though some users noted that the basic mounting hardware may require reinforcement for heavy-duty applications. The tank lacks some of the advanced features found on more expensive models, such as specialized baffling or premium locking mechanisms. We recommend this tank primarily for occasional users who need some additional range without investing in a premium system, or for those who primarily operate in mild environments where extreme durability features aren’t necessary.
- Compact design fits tight bed configurations
- Basic mounting kit included
- Compatible with most truck makes and models
Pros: Affordable entry point for auxiliary fuel storage; Compact footprint preserves bed utility
Cons: Lower capacity than most competitors; Basic construction with fewer features
6. WeatherTech L-Shaped Fuel Tank: Versatile Option
WeatherTech’s L-Shaped Fuel Tank offers a unique modular approach to auxiliary fuel storage with its 35-gallon capacity and customizable installation options. In our evaluation, the tank’s lower profile design helps maintain rear visibility and bed access, though this comes at the cost of reduced fuel capacity compared to competitors. The modular components allow for installation flexibility across various truck models and configurations.
Based on manufacturer specifications and owner feedback, the modular design creates more connection points than one-piece tanks, which increases potential leak points over time. Several users reported that the installation process, while flexible, required additional time and customization compared to more straightforward options. We recommend this tank primarily for those with unique space constraints that require a more flexible installation approach, though most users would be better served by a one-piece design with greater capacity.
- Modular components allow for customized installation
- Includes multiple mounting options
- Compact profile maintains bed visibility
Pros: Flexible installation options for different configurations; Lower profile improves rear visibility
Cons: Smallest capacity in our comparison; Modular design creates more potential leak points
7. S&B Tanks L-Shaped Auxiliary Fuel System: Specialized Use
The S&B Tanks L-Shaped Auxiliary Fuel System offers a specialized solution with its integrated electric pump system and custom-fit design for specific truck models. In our evaluation, the 30-gallon capacity provides modest range extension, while the integrated pump system simplifies fuel transfer to the main tank. The digital fuel level monitor is a convenient feature that allows for accurate capacity tracking from the cab.
Based on our research, the primary limitation of this system is its restricted compatibility with specific truck makes and models, significantly reducing its market appeal. The integrated electrical components, while convenient, introduce additional failure points and complexity compared to simpler gravity-fed systems. Owner feedback indicates that while the system works well for supported models, installation can be complex and troubleshooting electrical issues requires specialized knowledge. We recommend this tank only for owners of compatible truck models who prioritize the convenience of an integrated pump system over maximum capacity.
- Integrated electric pump simplifies fuel transfer
- Custom fit for specific truck models
- Includes digital fuel level monitor
Pros: Integrated pump system eliminates manual transfer; Custom fit ensures optimal space utilization
Cons: Limited to specific truck models; Smallest capacity with highest complexity
Frequently Asked Questions
Are L-shaped fuel tanks legal for use on public roads?
Yes, L-shaped auxiliary fuel tanks are generally legal for use on public roads when properly installed and used as auxiliary storage tanks rather than replacement fuel tanks. However, regulations vary by state and country, so we recommend checking local laws before installation. Proper mounting and venting are essential for legal compliance and safety.
How much additional range can I expect from an L-shaped fuel tank?
The additional range depends on both the tank capacity and your vehicle’s fuel efficiency. Most L-shaped auxiliary tanks hold between 30-60 gallons of fuel, which can extend your range by approximately 300-900 miles based on typical truck fuel economy. Your actual range extension will vary based on driving conditions, load weight, and your vehicle’s specific fuel consumption rate.
Do I need a special license to install an auxiliary fuel tank?
No special license is typically required for installing an auxiliary fuel tank for personal use. However, we strongly recommend following the manufacturer’s installation instructions precisely and ensuring all connections are secure. For commercial applications or installations involving complex fuel system modifications, professional installation may be advisable to ensure safety and compliance with regulations.
How do I maintain an L-shaped auxiliary fuel tank?
Regular maintenance includes visually inspecting the tank and connections for leaks or damage, checking mounting hardware for tightness, and ensuring vents remain clear of debris. Periodic cleaning of the tank’s exterior helps prevent corrosion, particularly for steel models. If storing the vehicle for extended periods, we recommend keeping the tank relatively full to minimize condensation buildup that could lead to internal corrosion.
Can I transfer fuel from the auxiliary tank to my main tank while driving?
Many L-shaped auxiliary tanks allow for fuel transfer while driving, particularly those equipped with electric pump systems. Gravity-fed systems typically require the vehicle to be stationary for safe transfer. Always follow the manufacturer’s guidelines regarding when and how to transfer fuel, as improper transfer procedures can create safety hazards. Never attempt to transfer fuel while the vehicle is moving unless the system is specifically designed for this purpose.
Our Verdict
Our top pick is the RDS Auxiliary Fuel Tank, which offers the best overall balance of capacity, durability, and value for most short bed truck owners. Its 50-gallon capacity provides significant range extension while the quality construction and mounting system ensure reliable performance. For those willing to invest more, the Transfer Flow L-Shaped Auxiliary Fuel Tank is our runner-up, offering greater capacity and a reliable gravity feed system at a premium price point.
