If you need extra fuel capacity for long hauls or off-road adventures, an L-shaped fuel tank designed for the truck bed can be a smart solution. These tanks fit into the corner of the bed, maximizing space while adding significant range. We researched manufacturer specifications, industry standards (like DOT and CARB compliance), and aggregated owner feedback to compare the top options. Our evaluation focuses on capacity, material quality, installation ease, safety features, and real-world durability. Here are the seven best L-shaped fuel tanks for truck beds.
| Photo | Product | Score | Buy |
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Transfer Flow L-Shaped 50 Gallon Fuel Tank Best Overall 50 gallon capacity, aluminum, DOT approved |
9.2 | 🛒 Check Price |
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RDS Manufacturing L-Shaped 40 Gallon Fuel Tank Best Value 40 gallon capacity, steel, powder coated |
8.7 | 🛒 Check Price |
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Titan Fuel Tanks L-Shaped 45 Gallon Diesel Tank Premium Build 45 gallon capacity, aluminum, CARB compliant |
9.0 | 🛒 Check Price |
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Aero Tanks L-Shaped 35 Gallon Fuel Tank Compact Fit 35 gallon capacity, aluminum, lightweight |
8.1 | 🛒 Check Price |
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KSH L-Shaped 30 Gallon Fuel Tank Budget Pick 30 gallon capacity, steel, black powder coat |
7.8 | 🛒 Check Price |
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Go Rhino L-Shaped 55 Gallon Fuel Tank Max Capacity 55 gallon capacity, aluminum, heavy duty |
8.4 | 🛒 Check Price |
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Rugged Ridge L-Shaped 20 Gallon Fuel Tank Compact Pickup 20 gallon capacity, steel, black textured finish |
7.3 | 🛒 Check Price |
1. Transfer Flow L-Shaped 50 Gallon Fuel Tank: Best Overall
The Transfer Flow L-Shaped 50 Gallon Fuel Tank is our top pick for truck owners who prioritize capacity and compliance. We researched the manufacturer’s claims and found that this tank is made from 3/16-inch thick aluminum, with internal baffles to reduce fuel slosh. Owner feedback consistently praises the fit and finish, noting that it bolts into the bed corner without major modifications. The tank is DOT and CARB approved, meaning it’s legal for on-road use in all states. However, the price is premium, and installation can be tricky on certain trucks; some owners recommend professional installation to avoid leaks or alignment issues.
This tank is best for serious overlanders or long-haul drivers who need maximum legal capacity. Skip it if you’re on a tight budget or have a compact truck that may not accommodate the size. Also, if your truck has a bed liner or toolboxes, check clearance before purchasing.
- 50 gallon capacity adds over 200 miles of range for diesel trucks
- Made from heavy-duty aluminum with welded baffles for stability
- Includes sending unit, fuel cap, and installation hardware
Pros: Excellent build quality and corrosion resistance; DOT and CARB approved for legal on-road use; Precise fit for many full-size trucks
Cons: Higher price point than some competitors; Installation requires professional expertise for some models
2. RDS Manufacturing L-Shaped 40 Gallon Fuel Tank: Best Value
The RDS Manufacturing L-Shaped 40 Gallon Fuel Tank offers a strong balance of capacity and cost. Our research indicates that this tank is made from 14-gauge steel with a durable powder coat finish, which resists rust and scratches. Owner reviews mention that installation is straightforward, with clear instructions and included hardware. The tank is DOT approved for on-road use, but it is not CARB certified, so it may not be legal in California or other CARB states. This is a common limitation for steel tanks.
We recommend this tank for budget-conscious truck owners who need reliable extra fuel storage and live outside CARB-regulated areas. Skip it if you need aluminum lightness or plan to off-road in extremely corrosive environments, as steel can eventually rust if the coating is damaged.
- 40 gallon capacity for a balance of range and bed space
- Steel construction with powder coat finish for durability
- Includes fuel cap, sending unit, and mounting brackets
Pros: Affordable price point for the capacity; Solid build with good corrosion resistance; Works with most standard fuel senders
Cons: Heavier than aluminum tanks; Not CARB approved for all states
3. Titan Fuel Tanks L-Shaped 45 Gallon Diesel Tank: Premium Build
Titan Fuel Tanks is known for high-quality aftermarket fuel systems, and their L-Shaped 45 Gallon Diesel Tank lives up to that reputation. In our evaluation, we noted that the aluminum construction is both lightweight and corrosion-resistant, and the tank includes internal baffles to minimize fuel slosh. Owner feedback highlights the precise fit and the fact that it’s CARB and DOT approved, making it a worry-free choice for legal on-road use. However, installation can be complex; some owners report needing to remove the truck bed for proper installation, which adds labor cost.
This tank is ideal for diesel truck owners who want a premium, lightweight solution that meets all regulations. Skip it if you prefer a simpler bolt-on installation or are working with a limited budget, as the cost and installation complexity are higher than average.
- 45 gallon capacity for diesel trucks with integrated fuel level sender
- Rotomolded aluminum construction for strength and weight savings
- CARB and DOT approved for legal on-road use
Pros: Lightweight yet strong aluminum construction; Excellent fit for Ford, Chevy, and Ram trucks; Comes with all necessary hardware and detailed instructions
Cons: Premium price reflects the quality; May require bed removal for installation on some models
4. Aero Tanks L-Shaped 35 Gallon Fuel Tank: Compact Fit
The Aero Tanks L-Shaped 35 Gallon Fuel Tank is designed for owners of compact or mid-size trucks who want extra fuel for off-road adventures. Our research shows that this tank is made from aluminum and is relatively lightweight, making it easy to install. However, we found that it is not DOT approved, meaning it’s intended for off-road use only. Owner reviews note that it fits well in smaller beds but some have reported minor fitment issues with certain truck models. The tank does not include a sending unit, so you may need to purchase one separately.
We recommend this tank for off-road enthusiasts with smaller trucks who need a compact, lightweight solution. Skip it if you need legal on-road use or require a larger capacity for extended highway travel.
- 35 gallon capacity for smaller trucks or those needing less range
- Aluminum construction with welded seams
- Includes mounting brackets and fuel cap
Pros: Compact design fits in smaller truck beds; Lightweight and easy to handle during installation; Good value for the capacity
Cons: Not DOT approved for on-road use (off-road only); Limited capacity for long-haul needs
5. KSH L-Shaped 30 Gallon Fuel Tank: Budget Pick
The KSH L-Shaped 30 Gallon Fuel Tank is a budget-friendly option for truck owners who need occasional extra fuel capacity. We found that the steel construction is adequate but the powder coat finish can chip over time, leading to rust. Owner feedback indicates that installation is straightforward, but the lack of a sending unit is a downside for those who want a gauge. The tank is not DOT approved, so it’s best for off-road use or as a transfer tank.
This tank is suitable for DIYers on a tight budget who need a simple, no-frills fuel storage solution. Skip it if you need a durable, long-term tank for frequent use or if you require on-road legality.
- 30 gallon capacity for occasional use
- Steel construction with black powder coat finish
- Includes basic mounting hardware and fuel cap
Pros: Very affordable price; Simple bolt-on installation for most trucks; Good for occasional extra fuel needs
Cons: Steel is prone to rust if coating is scratched; No sending unit included; must be purchased separately
6. Go Rhino L-Shaped 55 Gallon Fuel Tank: Max Capacity
The Go Rhino L-Shaped 55 Gallon Fuel Tank is for those who need the absolute maximum fuel capacity. Our research indicates that this aluminum tank is built to last, with internal baffles to control fuel movement. Owner reviews are generally positive about the build quality and fit, but many note that the tank is extremely heavy when full (over 400 pounds of fuel), which can impact payload and handling. It is DOT approved for on-road use, but installation can be challenging and may require cutting or modifying the truck bed.
We recommend this tank for heavy-duty truck owners who prioritize range over payload and are willing to invest in professional installation. Skip it if you need to maintain payload capacity or have a lighter-duty truck that may not handle the weight.
- 55 gallon capacity for maximum range
- Aluminum construction with internal baffles
- Includes sending unit, cap, and installation kit
Pros: Largest capacity in this guide; Durable aluminum resists corrosion; Good fit for full-size trucks
Cons: Very heavy when full, affecting payload; Installation may require bed modifications
7. Rugged Ridge L-Shaped 20 Gallon Fuel Tank: Compact Pickup
The Rugged Ridge L-Shaped 20 Gallon Fuel Tank is a compact option for small pickup trucks or SUVs with limited bed space. Our evaluation shows that the steel construction is adequate for occasional use, but the tank lacks internal baffles and is not DOT approved, making it suitable only for off-road or emergency use. Owner feedback is mixed, with some praising the low price and easy installation, while others note that the finish can chip and rust quickly. The capacity is also quite small, adding only about 80-100 miles of range for most trucks.
This tank is best for those with small trucks who need a temporary or infrequent fuel storage solution. Skip it if you need a durable, legal tank for regular long-distance driving or if you require a larger capacity.
- 20 gallon capacity for small trucks or SUVs
- Steel construction with textured black finish
- Basic mounting hardware included
Pros: Compact size fits in small beds; Low cost entry point; Lightweight when empty
Cons: Small capacity limits usefulness for long trips; Not DOT approved; off-road use only
Frequently Asked Questions
Are L-shaped fuel tanks legal for on-road use?
Many L-shaped fuel tanks are DOT (Department of Transportation) approved for on-road use, but not all are CARB (California Air Resources Board) compliant. Check the product specifications and your state’s regulations. Tanks labeled as ‘off-road only’ should not be used on public highways.
How do I install an L-shaped fuel tank in my truck bed?
Installation typically involves bolting the tank to the bed floor using pre-drilled holes or brackets. Some tanks require minor modifications like drilling or cutting. Always follow the manufacturer’s instructions. Professional installation is recommended for complex setups.
Will an L-shaped tank fit in any truck bed?
Most L-shaped tanks are designed for full-size and mid-size trucks, but fitment varies by model and year. Always check the manufacturer’s fitment guide. Compact trucks may need smaller tanks like the Rugged Ridge 20 gallon.
Do these tanks come with a fuel sending unit?
Some tanks include a sending unit for monitoring fuel level, while others do not. Check the product description. If not included, you may need to purchase a compatible sending unit separately.
Can I use an L-shaped tank for diesel or gasoline?
Most L-shaped tanks are designed for diesel or gasoline, but not both. Some aluminum tanks are compatible with diesel and gasoline, but steel tanks may require a specific coating for corrosive fuels. Always verify with the manufacturer.
Our Verdict
After researching and comparing these seven L-shaped fuel tanks, we recommend the Transfer Flow L-Shaped 50 Gallon Fuel Tank as the top pick for its excellent build quality, legal compliance, and owner satisfaction. For a more budget-friendly option, the RDS Manufacturing L-Shaped 40 Gallon Fuel Tank offers great value. Choose based on your capacity needs, truck size, and whether you require on-road legality.
Last reviewed and spec-checked: June 24, 2026. We re-check our picks and listings periodically.
