We researched and compared the top external fuel tanks for pickup trucks, evaluating manufacturer specifications, published safety standards, and aggregated owner feedback. Whether you need extra range for long hauls or a reliable transfer tank for job sites, our guide helps you choose. We focused on durability, ease of installation, safety certifications, and real-world performance. Below are our top picks, each with honest limitations.
| Photo | Product | Score | Buy |
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Transfer Flow 50 Gallon Replacement Fuel Tank Best Overall 50 gallon capacity, aluminum construction, EPA and CARB compliant |
9.0 | 🛒 Check Price |
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RDS Manufacturing 50 Gallon Transfer Tank Best Value 50 gallon capacity, steel construction, 12V pump included |
8.7 | 🛒 Check Price |
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Titan Fuel Tanks 40 Gallon Auxiliary Fuel Tank Best Fitment 40 gallon capacity, rotomolded polyethylene, vehicle-specific brackets |
8.4 | 🛒 Check Price |
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Northern Tool + Equipment 30 Gallon Diesel Transfer Tank Compact Pick 30 gallon capacity, steel, manual pump option |
8.1 | 🛒 Check Price |
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Rough Country 35 Gallon Auxiliary Fuel Tank Off-Road Ready 35 gallon capacity, steel skid plate, fits lifted trucks |
7.8 | 🛒 Check Price |
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Dee Zee 36 Gallon Diesel Transfer Tank Budget Pick 36 gallon capacity, steel, rotary pump |
7.3 | 🛒 Check Price |
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Lifetime 30 Gallon Fuel Tank Lightweight Option 30 gallon capacity, polyethylene, no pump included |
7.0 | 🛒 Check Price |
1. Transfer Flow 50 Gallon Replacement Fuel Tank: Best Overall
In our evaluation, the Transfer Flow 50 Gallon Replacement Fuel Tank stands out for its smooth integration and high capacity. It replaces the factory tank, adding 50 gallons without sacrificing bed space. Owner feedback consistently praises the aluminum build for durability and corrosion resistance. However, we note that installation can be complex on certain models, often requiring professional help. Also, the cost is higher than many transfer tanks, which may deter those on a tight budget.
This tank is ideal for long-distance travelers and heavy-duty truck owners who want maximum range without modifying the bed. Skip it if you need a portable solution or have a limited budget, as the price and installation effort are significant.
- Replaces factory tank for smooth integration and maximum capacity
- Aluminum construction resists corrosion and is lighter than steel
- Includes sending unit and hardware for straightforward installation
Pros: Significantly increases range without losing bed space; High build quality with excellent fitment for popular truck models
Cons: Requires professional installation for some vehicles; Premium price point may not suit budget-conscious buyers
2. RDS Manufacturing 50 Gallon Transfer Tank: Best Value
Our research shows the RDS Manufacturing 50 Gallon Transfer Tank offers the best balance of cost and capability. It comes as a complete kit with a 12V pump, making it ready to use out of the box. Owner reviews highlight its durability on job sites and the powder coat finish that resists rust. However, we found the steel construction adds noticeable weight, and the lack of a fuel gauge is a minor inconvenience.
This tank is a strong choice for contractors and farmers who need a rugged, affordable transfer tank. Skip it if you prioritize weight savings or want a built-in gauge, as those features are absent.
- Heavy-duty steel with powder coat finish for long life
- Includes 12V pump, hose, and nozzle for easy dispensing
- Meets DOT and EPA requirements for diesel storage
Pros: Excellent value with pump included; Sturdy construction handles job site abuse
Cons: Steel is heavier than aluminum alternatives; No fuel gauge included (optional add-on)
3. Titan Fuel Tanks 40 Gallon Auxiliary Fuel Tank: Best Fitment
Based on owner feedback and the spec sheets, the Titan Fuel Tanks 40 Gallon Auxiliary Fuel Tank excels in ease of installation. The vehicle-specific brackets make it a bolt-on solution for many Ford, Chevy, and Ram trucks. The rotomolded polyethylene is lightweight and impervious to rust. However, we note that it only fits certain model years, and the 40-gallon capacity is modest compared to larger steel tanks.
This tank is perfect for DIYers who want a straightforward install without modifications. Skip it if you have an older or less common truck model, as fitment options are limited.
- Custom-designed brackets for popular truck models
- Lightweight polyethylene resists dents and corrosion
- Includes all hardware and instructions for DIY installation
Pros: Excellent fitment with no drilling required; Lightweight and rust-proof material
Cons: Limited to specific truck models; Lower capacity than some steel tanks
4. Northern Tool + Equipment 30 Gallon Diesel Transfer Tank: Compact Pick
Our evaluation of the Northern Tool 30 Gallon Diesel Transfer Tank reveals it is a practical entry-level option. Its compact footprint leaves room for other gear, and the manual pump eliminates electrical complexity. Owner feedback indicates it holds up well under moderate use. However, we found the manual pump can be tiring for frequent dispensing, and the 30-gallon capacity is limiting for extended hauls.
This tank suits occasional users or those with short commutes who need a small backup supply. Skip it if you need high-volume transfer or frequent refueling, as the manual pump and small tank will frustrate.
- Compact size fits easily in truck bed
- Manual pump included for simple operation
- Durable steel with red powder coat finish
Pros: Affordable and space-saving; Manual pump requires no power
Cons: Manual pump is slow and labor-intensive; 30 gallons may be too small for long trips
5. Rough Country 35 Gallon Auxiliary Fuel Tank: Off-Road Ready
In our research, the Rough Country 35 Gallon Auxiliary Fuel Tank is built for off-road use. The included skid plate shields the tank from trail debris, and the design accommodates lifted suspensions. Owner reviews from off-roaders praise its ruggedness. However, we note that the steel construction adds significant weight, impacting payload. Also, installation is more complex on stock-height trucks.
This tank is best for off-road enthusiasts who frequently venture on rough terrain. Skip it if you drive mostly on pavement or need to maximize payload, as the weight penalty is substantial.
- Includes skid plate for off-road protection
- Designed to fit trucks with suspension lifts
- Powder-coated finish resists scratches
Pros: Integrated skid plate protects against rocks; Fits lifted trucks without interference
Cons: Heavy and reduces payload capacity; Installation can be challenging on non-lifted trucks
6. Dee Zee 36 Gallon Diesel Transfer Tank: Budget Pick
Based on owner feedback and our comparison, the Dee Zee 36 Gallon Diesel Transfer Tank is a no-frills budget option. It gets the job done for those who need a simple tank without extras. However, we found the rotary pump has a reputation for leaking after extended use, and the lack of a gauge is inconvenient. The steel construction is adequate but not premium.
This tank is acceptable for occasional use or tight budgets. Skip it if you need reliability for daily heavy use, as the pump issues and missing features become problematic.
- Low-cost option for basic fuel storage
- Rotary pump provides decent flow rate
- Simple rectangular design fits most beds
Pros: Very affordable compared to competitors; Decent capacity for the price
Cons: Rotary pump prone to leaks over time; No fuel gauge or vent included
7. Lifetime 30 Gallon Fuel Tank: Lightweight Option
In our evaluation, the Lifetime 30 Gallon Fuel Tank is the lightest option we considered. Its polyethylene construction makes it easy to lift and position, and the translucent body lets you see the fuel level. Owner feedback notes it works well under tonneau covers. However, we found that it does not include a pump, adding to the total cost. Additionally, some users report cracking in very cold climates.
This tank is suitable for those who prioritize weight savings and have a separate pump. Skip it if you need a self-contained system or live in extremely cold regions, as durability may be a concern.
- Lightweight polyethylene is easy to handle
- Translucent body allows visual fuel level check
- Low profile design fits under tonneau covers
Pros: Very light and easy to move; Can be used under tonneau covers
Cons: No pump included (must buy separately); Polyethylene may crack in extreme cold
Frequently Asked Questions
Are external fuel tanks legal for on-road use?
Yes, most external fuel tanks designed for pickup trucks are legal for on-road use if they meet DOT and EPA requirements. We recommend checking your state and local regulations, especially regarding fuel type (diesel vs. gasoline) and tank capacity. Some tanks are CARB approved for California compliance.
Can I use an external fuel tank for gasoline or only diesel?
Many external tanks are specifically designed for diesel due to its lower volatility and safety considerations. Gasoline tanks require different materials and safety certifications. Always verify the tank’s approved fuel type; using a diesel tank for gasoline can be dangerous and illegal.
How do I install an external fuel tank in my truck bed?
Installation varies by product. Most transfer tanks come with mounting brackets and require bolting to the truck bed floor using pre-drilled holes or by drilling new ones. Some auxiliary tanks replace the factory tank or use custom brackets. We recommend professional installation if you are not experienced with automotive modifications.
What safety features should I look for in an external fuel tank?
Look for tanks that meet DOT and EPA standards, have secure mounting systems, include venting to prevent pressure buildup, and use anti-siphon valves. Some tanks also feature crashworthiness designs and flame arrestors. Always ensure the tank is properly grounded to avoid static discharge.
How much does an external fuel tank reduce payload capacity?
The weight of the tank plus fuel reduces your truck’s payload. For example, a 50-gallon steel tank can weigh over 100 pounds empty, and diesel fuel weighs about 7 pounds per gallon. So a full 50-gallon tank adds around 450 pounds. Check your truck’s payload rating to ensure you stay within limits.
Our Verdict
After researching and comparing top options, the Transfer Flow 50 Gallon Replacement Fuel Tank is our top pick for its smooth integration and high capacity. For a more budget-friendly transfer tank that includes a pump, the RDS Manufacturing 50 Gallon Transfer Tank is an excellent runner-up.
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