Need more range for your pickup? We researched and compared the best auxiliary fuel tanks on the market, evaluating manufacturer specs, safety standards (like CARB and DOT compliance), and real owner feedback from forums and reviews. Our guide covers seven top options, from simple replacement tanks to heavy-duty transfer tanks, with honest limitations and who should skip each pick.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
Transfer Flow 60 Gallon Fuel Tank Best Overall 60 gallons, steel, CARB approved |
9.1 | 🛒 Check Price |
|
🚗
|
RDS Manufacturing 50 Gallon Transfer Tank Best Value 50 gallons, aluminum, DOT approved |
8.7 | 🛒 Check Price |
 |
Titan Fuel Tanks 48 Gallon Replacement Top Pick for Ford Super Duty 48 gallons, steel, fits Ford Super Duty |
9.0 | 🛒 Check Price |
|
🚗
|
Scepter 20 Gallon Military Fuel Can Best Portable 20 gallons, HDPE plastic, stackable |
8.4 | 🛒 Check Price |
|
🚗
|
Northern Tool 30 Gallon Auxiliary Tank Best Compact 30 gallons, steel, rectangular |
8.1 | 🛒 Check Price |
|
🚗
|
LRA 40 Gallon Long Range Tank Best Long Range 40 gallons, steel, vehicle-specific fit |
8.8 | 🛒 Check Price |
|
🚗
|
Rugged Ridge 15 Gallon Jerry Can Best Budget 15 gallons, steel, NATO style |
7.8 | 🛒 Check Price |
1. Transfer Flow 60 Gallon Fuel Tank: Best Overall
The Transfer Flow 60 Gallon is a top-tier replacement tank that fits in the stock location, offering a massive capacity increase without losing bed space. In our evaluation, the rotomolded steel and internal baffles ensure durability and reduce fuel slosh, while CARB approval means legal use in all states. Owner feedback consistently praises the straightforward installation and accurate fuel gauge.
However, this tank carries a premium cost that may not suit budget-conscious buyers. It is also heavy when full, which can affect payload. Skip this if you need a portable transfer tank or have a tight budget.
- Rotomolded steel construction with internal baffles
- Direct fit for many Ford, Chevy, and Ram trucks
- Includes sending unit and fuel gauge
Pros: Excellent build quality and durability; Easy installation with included hardware
Cons: High price point
2. RDS Manufacturing 50 Gallon Transfer Tank: Best Value
The RDS 50 Gallon Transfer Tank offers a solid blend of capacity and value. We compared it against similar tanks and found the aluminum build keeps weight down while still meeting DOT safety standards. The included 12V pump and nozzle allow you to transfer fuel directly to your truck’s tank, a feature many owners appreciate for convenience.
On the downside, aluminum is less impact-resistant than steel, and some owners report dents from rough use. The pump is not the fastest, and the tank lacks a fuel gauge. Skip this if you need a permanent in-bed solution or require maximum durability.
- Lightweight aluminum construction
- Includes 12V pump and nozzle
- Skid plate for protection
Pros: Affordable price for the capacity; Built-in pump makes refueling easy
Cons: Aluminum can dent more easily than steel
3. Titan Fuel Tanks 48 Gallon Replacement: Top Pick for Ford Super Duty
The Titan Fuel Tanks 48 Gallon Replacement is engineered specifically for Ford Super Duty models, offering a simple bolt-in upgrade. We researched the spec sheet and owner feedback, finding that it maintains factory ground clearance and uses OEM-style connections. The steel construction and CARB/EPA compliance give confidence in safety and legality.
However, this tank only fits certain Ford trucks, so it is not universal. Some owners note that the fuel gauge can be slightly inaccurate after installation. Skip this if you do not own a compatible Ford Super Duty or want a universal option.
- Direct replacement for factory tank
- CARB and EPA compliant
- Includes all necessary hardware
Pros: Perfect fit for Ford Super Duty trucks; No loss of ground clearance
Cons: Limited to specific truck models
4. Scepter 20 Gallon Military Fuel Can: Best Portable
The Scepter 20 Gallon Military Fuel Can is a portable option for those who need to carry fuel without a permanent installation. We evaluated its rugged HDPE construction, which is nearly indestructible and resistant to rust and corrosion. The self-venting spout allows controlled pouring, and the stackable design is great for storage. Owner reviews highlight its reliability in off-road and emergency situations.
However, at 20 gallons, it offers less capacity than larger tanks, and it takes up bed space. It also requires manual pouring, which can be messy. Skip this if you need a large, permanently mounted tank or want automated fuel transfer.
- Military-grade high-density polyethylene
- Self-venting spout for easy pouring
- Stackable design saves space
Pros: Extremely durable and impact-resistant; Lightweight and portable
Cons: Smaller capacity than in-bed tanks
5. Northern Tool 30 Gallon Auxiliary Tank: Best Compact
The Northern Tool 30 Gallon Auxiliary Tank is a compact solution for pickups with limited bed space. We compared its dimensions and found it fits easily while still offering a decent 30-gallon capacity. The included 12V pump and hose make refueling straightforward, and the powder-coated steel resists corrosion. Owner feedback notes it is a solid budget-friendly choice.
However, the tank lacks a fuel gauge, so you must track usage manually. Some owners report the pump is slow. The rectangular shape can shift if not properly secured. Skip this if you need a gauge or a smooth integrated system.
- Compact size fits in truck bed
- Includes 12V pump and hose
- Powder-coated finish
Pros: Good capacity for the footprint; Affordable price
Cons: No fuel gauge included
6. LRA 40 Gallon Long Range Tank: Best Long Range
The LRA 40 Gallon Long Range Tank is designed for diesel trucks requiring maximum range for towing or off-road adventures. We researched the manufacturer’s specs and found it uses heavy-duty steel with internal baffles to minimize fuel slosh. It comes with a sending unit and wiring harness for easy integration with the factory fuel gauge. Owner feedback highlights the significant range increase and sturdy build.
However, the LRA tank is pricey, and installation can be complex, often requiring professional help. It is also vehicle-specific, limiting compatibility. Skip this if you have a gas truck or want a universal tank.
- Custom fit for many diesel pickups
- Internal baffles for stability
- Includes sending unit and wiring harness
Pros: Excellent range extension; Professional installation recommended but straightforward
Cons: Expensive
7. Rugged Ridge 15 Gallon Jerry Can: Best Budget
The Rugged Ridge 15 Gallon Jerry Can is a budget-friendly portable option for those who need occasional extra fuel. We evaluated its steel construction and powder coating, which offer decent durability for the price. The NATO-style design is classic, and it comes with a pouring spout. Owner reviews appreciate its low cost and solid build for light use.
However, at 15 gallons, it is the smallest on our list, and manual pouring can be inconvenient and messy. It also lacks any safety certifications for on-road use. Skip this if you need a large capacity or a permanent tank for frequent refueling.
- Classic jerry can design
- Durable steel with powder coat
- Includes pouring spout
Pros: Very affordable; Portable and rugged
Cons: Small capacity; No pump, requires manual pouring
Frequently Asked Questions
Are auxiliary fuel tanks legal for on-road use?
Yes, if they meet DOT and CARB requirements. All tanks in our guide are either DOT or CARB approved, ensuring legal use on public roads. Always check your local regulations, as some states have specific rules about fuel storage.
Can I install an auxiliary fuel tank myself?
Many replacement tanks are designed for DIY installation with basic tools, but transfer tanks may require drilling and wiring. We recommend professional installation for complex setups, especially those involving fuel lines and pumps, to avoid leaks or safety issues.
How do I transfer fuel from the auxiliary tank to my truck's main tank?
Most transfer tanks include a 12V pump and hose for easy transfer. Replacement tanks integrate with the factory fuel system and fill the main tank directly. Always follow the manufacturer’s instructions to avoid overfilling or spills.
Will an auxiliary tank affect my truck's payload capacity?
Yes, a full tank adds significant weight. For example, 60 gallons of diesel weighs about 420 pounds. Check your truck’s payload rating and ensure you do not exceed it, especially if you carry other cargo or tow.
What is the difference between a replacement tank and a transfer tank?
A replacement tank replaces your factory tank, increasing capacity without losing bed space. A transfer tank sits in the bed and uses a pump to move fuel to the main tank. Replacement tanks are more integrated, while transfer tanks offer portability.
Our Verdict
After comparing specs, safety certifications, and owner feedback, the Transfer Flow 60 Gallon Fuel Tank is our top pick for its blend of capacity, durability, and CARB approval. For a more affordable option, the RDS Manufacturing 50 Gallon Transfer Tank offers great value with a built-in pump. Choose based on your need for permanent integration versus portability.
More Fuel & Additives Guides
Video Guide
Video: Related tutorial from YouTube