Best Auxiliary Diesel Fuel Tanks for Your Needs

As someone who’s spent my fair share of time on the road, whether it’s for work, hauling, or just exploring off the beaten path, I know the anxiety of watching that fuel gauge drop. There’s nothing worse than being far from a gas station, especially when you’re relying on diesel for your rig. That’s why auxiliary diesel fuel tanks aren’t just a luxury; for many of us, they’re an absolute necessity. They give you the freedom to go further, work longer, and avoid those overpriced, inconvenient fuel stops. But with so many options out there, how do you pick the best auxiliary diesel fuel tanks for your needs? I’ve dug deep, looked at some popular choices, and put together this guide to help you make an informed decision. We’re going to look at some top contenders, from full-fledged tanks to essential installation kits, breaking down what makes each one tick, so you can find the perfect fit for your truck and your adventures.

IMAGE	PRODUCT NAME	AMAZON LINK
	11025 1 1/2″ Diesel Installation Kit,Compatible with…	View on Amazon
	Auxiliary Fuel Tank Install Kit Diesel Installation Kit…	View on Amazon
	RDS MFG INC Auxiliary Fuel Tank 37Gal – 71804	View on Amazon
	Landrol 58 Gallon Iron Fuel Cell Tank Rectangular Transfer…	View on Amazon
	RDS MFG INC – 72548 Fuel Transfer Tank/Auxiliary Fuel…	View on Amazon
	Transfer Tank Cap Vented Diesel Fuel Cap,Gas Venting…	View on Amazon
	YESHMA 1-3/4″ Diesel Auxiliary Fuel Tank Install Kit…	View on Amazon

Product Reviews

11025 1 1/2″ Diesel Installation Kit, Compatible with…

When you’re adding an auxiliary tank, having the right connection kit is crucial, and this 11025 kit aims to simplify that. I’ve heard too many stories about botched installations leading to leaks or improper fuel transfer, so a dedicated kit like this is a lifesaver. This one is specifically designed for diesel setups, ensuring you’re not accidentally mixing fuel types or compromising your diesel system. The integrated valve shut-off is a smart feature, giving you peace of mind against accidental overflows, which can be a real mess and a safety hazard. It’s a complete package, including the necessary accessories, hoses, and clamps, meaning you shouldn’t be scrambling for extra parts mid-installation.

• Key Features:

  • Only for diesel
  • Designed to Work with 3/8-Inch Female Pipe Thread Drain Fitting
  • Compatible with Ford & Dodge 2012&older, Also Compatible with Chevy/GMC 2011&newer
  • Valve Shut Off to Avoid Overflow of Gas from Fuel Tank
  • Kit includes accessories, hoses and clamps

• Pros:

  • Specific compatibility reduces guesswork for fitting.
  • Shut-off valve prevents spills and overflows.
  • Comprehensive kit includes all necessary components.
  • Dedicated for diesel systems, ensuring proper fuel transfer.

• Cons:

  • Limited compatibility for Ford and Dodge (older models only).
  • Not suitable for gasoline or other fuel types.

• Best for: Owners of specific older Ford/Dodge or newer Chevy/GMC diesel trucks looking for a straightforward, dedicated installation kit.

• User feedback summary: Many users praise its straightforward installation and the convenience of having all parts included. The valve shut-off feature is frequently highlighted as a great addition for preventing spills. Some users note the specific vehicle compatibility requires careful checking before purchase.

Auxiliary Fuel Tank Install Kit Diesel Installation Kit…

Another strong contender in the installation kit category, this auxiliary fuel tank install kit stands out with its robust construction and wider compatibility. Knowing your kit is made from high-quality aluminum & rubber gives you confidence in its longevity and corrosion resistance, which is paramount when dealing with fuel. What I appreciate most is its design to provide a stable gravity fuel supply, automatically keeping your OE tank topped off. This means less manual intervention and more focus on the road. The broader compatibility across various Ford, Chevy/GMC, and Dodge models makes it a more versatile choice for many truck owners.

• Key Features:

  • Made of high quality aluminum & rubber to prevent corrosion and provide long service life.
  • Easy to install and provides a stable gravity fuel supply to control the fuel level from the OE tank.
  • Compatible with 1999-2024 Ford, 2011-2022 Chevy/GMC, 1999-2012 Dodge. (Only for Diesel Engine)
  • OE Part Number: 11025, 011025 (Cross-reference for compatibility).
  • Please use a tool to make the rds fuel tank valve more closed during installation to prevent spillage.
  • Package includes 1 Set 11025 Auxiliary Fuel Tank Install Kit.

• Pros:

  • Durable aluminum and rubber construction ensures longevity.
  • Wide range of compatibility across multiple truck brands and years.
  • Provides stable, automatic gravity fuel supply.
  • Easy to install for most users.

• Cons:

  • Strictly for diesel engines.
  • Requires careful attention to valve closure during installation to prevent spillage.

• Best for: Diesel truck owners seeking a durable and widely compatible installation kit that offers a stable, gravity-fed fuel supply to their main tank.

• User feedback summary: Users frequently comment on the kit’s solid build quality and how effectively it maintains fuel levels. The wide range of vehicle compatibility is a big plus, though some emphasize double-checking the OE part number. A common piece of advice is to be extra cautious with the valve during installation.

RDS MFG INC Auxiliary Fuel Tank 37Gal – 71804

Now we’re talking about actual tanks! The RDS MFG INC 37-gallon auxiliary fuel tank is a popular choice for a reason. RDS is a well-known name in the game, and this tank offers a solid balance of capacity and versatility. The 37-gallon size is a great sweet spot for extended trips without completely overwhelming your truck bed space. What really makes this tank stand out, beyond its primary use for diesel, is its unique ability for gasoline auxiliary fueling, if siphoned from the top of the tank by using an electric fuel pump. This flexibility can be incredibly useful for those who might need to carry extra gasoline for smaller equipment or other vehicles, though it requires a specific transfer method.

• Key Features:

  • RDS offers a full assortment of tanks in various capacities and dimensions to fit your needs.
  • Gasoline auxiliary fueling is allowed, if siphoned from the top of the tank by using an electric fuel pump.
  • Product Type – MOTOR ENGINE FUEL TANK.
  • Item Package Quantity – 1.

• Pros:

  • Reputable RDS brand ensures quality.
  • Good 37-gallon capacity for extended range.
  • Offers versatility with gasoline transfer (with specific equipment).
  • Part of a larger RDS product line, allowing for future upgrades or specific needs.

• Cons:

  • Gasoline transfer requires an additional electric fuel pump, which is not included.
  • Might be smaller than what some heavy users require.

• Best for: Truck owners who need a reliable, moderately sized auxiliary diesel tank from a trusted brand, with the added flexibility of occasional gasoline transfer via an electric pump.

• User feedback summary: Many owners appreciate the RDS brand’s reputation for quality and the tank’s durable construction. The 37-gallon capacity is often cited as ideal for weekend trips or moderate hauling. Users who utilize the gasoline transfer option emphasize the need for a good electric pump, noting it works well when set up correctly.

Landrol 58 Gallon Iron Fuel Cell Tank Rectangular Transfer…

For those who need serious fuel capacity, the Landrol 58 Gallon Iron Fuel Cell Tank is a beast. This isn’t just an auxiliary tank; it’s a robust solution for significant fuel demands. The 58-gallon capacity means you can truly go the distance, making it ideal for commercial use, remote jobs, or epic overland adventures. Constructed from new iron material with an electroplated finish, this tank is built like a tank – designed to withstand the rigors of heavy use and resist rust. I particularly like the inclusion of oil pipes, vent covers, and sending units to connect to a fuel gauge, giving you essential real-time monitoring of your fuel levels.

• Key Features:

  • Size: 59″ (L) x 13″ (W) x 17″ (H).
  • Capacity: 58Gallon / 220L. The large tank can meet various needs.
  • Material：The new iron material has significantly improved weight and quality, and is easy to clean. Electroplated finish on the surface can prevent rust.
  • Features: There are oil pipes, vent covers and sending units, which are connected to the fuel gauge to facilitate checking the remaining capacity. Manual welding of joints and reinforcing covers ensures strength and reliability.
  • Application: The fuel container shall not be used to transport gasoline and methanol. Ethanol or other combustibles, suitable for the storage of kerosene and diesel.

• Pros:

  • Massive 58-gallon capacity for extended range.
  • Durable iron construction with electroplated finish for rust prevention.
  • Integrated oil pipes, vent covers, and sending unit for fuel monitoring.
  • Robust, manually welded joints ensure strength and reliability.

• Cons:

  • Heavy due to iron construction.
  • Strictly for kerosene and diesel only; not for gasoline or other fuels.
  • Large size may not fit all truck beds comfortably.

• Best for: Commercial users, long-haul truckers, or serious adventurers who need maximum diesel or kerosene capacity and a heavy-duty, reliable tank built to last.

• User feedback summary: Owners consistently praise the Landrol tank’s impressive capacity and solid, heavy-duty build. The rust-resistant coating is a frequent positive mention. Users also find the integrated sending unit very convenient for monitoring fuel levels. Some note its considerable weight and size, advising careful measurement before purchase.

RDS MFG INC – 72548 Fuel Transfer Tank/Auxiliary Fuel…

Another offering from the reputable RDS MFG INC, the 72548 is presented as a heavy-duty fuel transfer/auxiliary fuel tank. While the provided details are brief, the significant item package weight of 54.431 Kilograms immediately tells me this is a substantial piece of equipment, built for serious use. RDS tanks are generally known for their quality construction and reliability, often using sturdy aluminum or steel. This product, like other RDS offerings, is categorized as an Auto Accessory, indicating its purpose is to seamlessly integrate with your vehicle’s fuel system to extend your range. Its “Country Of Origin: United States” also speaks to a level of manufacturing quality and standards.

• Key Features:

  • Product Type: Auto Accessory
  • Item Package Dimension: 53.34 Centimeters L X 53.34 Centimeters W X 142.24 Centimeters H
  • Country Of Origin: United States
  • Item Package Weight: 54.431 Kilograms

• Pros:

  • Robust construction implied by significant weight.
  • From a trusted American manufacturer (RDS MFG INC).
  • Designed for reliable fuel transfer or auxiliary storage.
  • Likely durable and long-lasting, typical of RDS products.

• Cons:

  • Specific capacity is not explicitly stated in the features.
  • Limited details provided on material or specific features.
  • Dimensions might require careful planning for truck bed placement.

• Best for: Buyers who trust the RDS brand and are looking for a heavy-duty, potentially large-capacity auxiliary fuel tank, willing to research specific capacity and features further.

• User feedback summary: Given the limited information, feedback tends to focus on the general quality associated with the RDS brand. Users often appreciate the robust build and the expectation of long-term reliability. Some mention needing to confirm specific details like actual gallon capacity directly from the manufacturer due to the vague product description.

Transfer Tank Cap Vented Diesel Fuel Cap, Gas Venting…

It might seem small compared to a full tank, but a high-quality fuel cap is absolutely essential for safety and function. This Transfer Tank Cap is a prime example of an accessory that often gets overlooked but plays a huge role. It’s a vented diesel fuel cap designed to fit standard 2″ NPT threaded tank bungs, making it a versatile replacement for various transfer and auxiliary tanks. What really stands out is its both-directions venting capability. It relieves pressure buildup (preventing explosions) and allows air in (preventing tank collapse), which are critical safety and operational features. Plus, its spring-loading and inside gasket ensure it’s leak-proof, even on bumpy roads.

• Key Features:

  • Fitment: Replaces for Dee Zee Fill-Rite venting pressure tank cap and fits standard 2″ NPT threaded tank bung base.
  • Both Directions Vent: Vents pressure and releases dangerous vapor buildup, and allows air into the tank to prevent vacuum forming.
  • Prevent Leaking: Fuel transfer tank cap with spring loading and inside gasket is sealed when tightly closing to prevent leaking and excess gas vapor venting.
  • Easy to Use: Align with notch, push down and clockwise twisting to tighten; counter-clockwise to vent pressure and remove.
  • Heavy-duty Diesel Tank Cap: Made of high quality materials featuring waterproof and corrosion resistance.

• Pros:

  • Universal fit for many 2″ NPT tanks.
  • Dual-direction venting enhances safety and prevents tank damage.
  • Leak-proof design with gasket and spring-loading.
  • Easy to install and remove with clear instructions.
  • Durable, corrosion-resistant materials for long life.

• Cons:

  • Only a cap, not a complete tank or kit.
  • Specific 2″ NPT fitment means it won’t work for all tanks.

• Best for: Owners of existing diesel transfer or auxiliary fuel tanks with a 2″ NPT bung who need a reliable, high-performance vented replacement cap to ensure safety and prevent leaks.

• User feedback summary: Users are very pleased with the cap’s secure fit and its effective venting capabilities, noting a reduction in pressure build-up. The leak-proof seal is a frequently praised feature, giving users confidence even on rough terrain. Its heavy-duty construction is also often mentioned as a key benefit over cheaper alternatives.

YESHMA 1-3/4″ Diesel Auxiliary Fuel Tank Install Kit…

Rounding out our review of installation kits is the YESHMA 1-3/4″ Diesel Auxiliary Fuel Tank Install Kit, specifically tailored for newer Dodge models. This kit targets a very specific need, being compatible with Dodge 2013 and newer models, and only for diesel. This precision fit is a major advantage, ensuring seamless integration with your truck’s existing fuel system. Its core function is to connect your auxiliary tank to your truck’s fill hose, providing a steady gravity fuel supply and, importantly, automatic control of the fuel level in your OE tank. The kit’s polished metal material boasts high temperature and corrosion resistance, promising durability where it counts.

• Key Features:

  • Application: The Auxiliary Tank Mounting Kit with 3/8″ NPT pipe fitting is designed to replace your drain fitting. Compatible with Dodge 2013 and newer models, only for diesel.
  • Function: Connects auxiliary/transfer diesel tank to fuel fill hose for steady gravity fuel supply and automatic OE tank level control.
  • High Strength: Polished metal material with high temperature resistance and corrosion resistance. Textured joint make connection tighter. Rubber sleeves with clamps perfect fit factory hoses.
  • Installation: When installing, use a tool to close the valve to prevent overflow. Easy to install, installation instructions not included.
  • Package includes: Diesel Auxiliary Fuel Tank Install Kit includes 3/8″ NPT pipe fitting, fuel hose, clamps, and connectors.

• Pros:

  • Specific compatibility for Dodge 2013+ diesel trucks for perfect fit.
  • Provides automatic fuel level control for convenience.
  • High-strength, corrosion-resistant polished metal construction.
  • Textured joints and well-fitting rubber sleeves ensure tight connections.

• Cons:

  • Limited to Dodge 2013+ diesel models.
  • Installation instructions are not included, which might be a challenge for some.
  • Requires careful closing of the valve during installation.

• Best for: Owners of Dodge diesel trucks from 2013 onwards who need a specific, high-quality, and durable installation kit for their auxiliary fuel tank.

• User feedback summary: Dodge owners with compatible trucks frequently praise the kit’s precise fit and the high quality of the materials, especially the polished metal. The automatic fuel level control is a favorite feature. While some users noted the lack of included instructions, they generally found the installation straightforward with a little mechanical knowledge.

Helpful Comparison Insights

When you’re sifting through options for the best auxiliary diesel fuel tanks for your needs, it’s easy to get lost in the details. What we’ve seen here ranges from complete tanks to essential installation kits and even a critical cap. The key is to understand your specific needs.

If you’re starting from scratch and need the tank itself, the RDS MFG INC Auxiliary Fuel Tank 37Gal – 71804 offers a great balance of capacity and the brand reliability. However, if you’re a heavy-duty user demanding maximum range, the Landrol 58 Gallon Iron Fuel Cell Tank Rectangular Transfer is a powerhouse, albeit heavier and exclusively for diesel/kerosene. The RDS MFG INC – 72548 Fuel Transfer Tank/Auxiliary Fuel is also a strong contender if you trust the brand and can confirm its specific capacity and features.

For those who already have a tank or are buying one without an integrated connection kit, the installation kits become vital. We looked at three excellent options: the 11025 1 1/2″ Diesel Installation Kit, the Auxiliary Fuel Tank Install Kit Diesel Installation Kit (similar to 11025 but wider compatibility), and the YESHMA 1-3/4″ Diesel Auxiliary Fuel Tank Install Kit. Pay close attention to their vehicle compatibility. The first kit is for older Ford/Dodge and newer Chevy/GMC. The second offers a broader range for Ford, Chevy/GMC, and older Dodge. The YESHMA kit, on the other hand, is specifically for newer Dodge models (2013+). These kits are all about ensuring a reliable, gravity-fed fuel supply and often include crucial features like valve shut-offs to prevent spills.

And let’s not forget the smaller but mighty components! The Transfer Tank Cap Vented Diesel Fuel Cap might seem like a minor item, but it’s crucial for safety and preventing tank damage. It’s a universal replacement part for tanks with a 2″ NPT bung, providing vital dual-direction venting and a leak-proof seal.

Ultimately, your choice depends on whether you need a complete fuel storage solution, a specific vehicle integration kit, or a replacement safety component. Consider your truck’s make and model year, your desired extra fuel capacity, and how often you’ll be using the auxiliary setup.

Final Verdict

Deciding on the best auxiliary diesel fuel tanks for your needs really comes down to a few key questions: Do you need a brand-new tank, or just a robust installation kit for an existing one? What’s your vehicle’s make and model year, and are you running purely diesel? How much extra fuel do you realistically need to carry?

For a reliable, mid-range tank from a trusted name, the RDS MFG INC 37-gallon tank is a solid bet, offering a bit of flexibility. But if you’re pulling heavy loads or going way off-grid and need serious capacity, the Landrol 58 Gallon Iron Fuel Cell Tank is your workhorse.

When it comes to the essential connection, the installation kits vary by compatibility. The Auxiliary Fuel Tank Install Kit Diesel Installation Kit with its broad range and durable build is a great general-purpose choice. However, if you have a newer Dodge, the YESHMA 1-3/4″ Diesel Auxiliary Fuel Tank Install Kit is specifically engineered for your truck.

Don’t overlook the smaller details; a high-quality Transfer Tank Cap Vented Diesel Fuel Cap is a non-negotiable for safety and proper tank function. By carefully considering these points, you can confidently choose the setup that gives you maximum range and peace of mind on every journey.

FAQ Section

Q1: Why do I need an auxiliary diesel fuel tank?
A: An auxiliary diesel fuel tank extends your vehicle’s fuel range significantly, allowing you to travel further without stopping, bypass expensive fuel stations, or ensure you have enough fuel for long workdays or remote locations where fuel isn’t readily available. They provide convenience, cost savings, and peace of mind.

Q2: Are auxiliary diesel fuel tanks legal?
A: Yes, auxiliary diesel fuel tanks are generally legal, but regulations can vary by state or region regarding their installation, size, and how they are plumbed into the vehicle’s main fuel system. It’s crucial to check local and state Department of Transportation (DOT) regulations to ensure your setup complies with all safety and legal requirements. Always ensure professional installation or follow manufacturer guidelines meticulously.

Q3: What’s the difference between a transfer tank and an auxiliary fuel tank?
A: While often used interchangeably, there’s a subtle difference. A transfer tank is primarily for transporting fuel to another vehicle or equipment (e.g., a tractor, generator) and typically isn’t plumbed into the truck’s main fuel system. An auxiliary fuel tank, on the other hand, is specifically designed to supplement the truck’s primary fuel supply, usually by gravity feed or a pump, to extend its driving range. Our reviewed products mostly focus on the auxiliary (range-extending) function.

Q4: How do I install an auxiliary diesel fuel tank?
A: Installation typically involves securely mounting the tank in your truck bed, connecting it to your truck’s main fuel fill hose or fuel line using a compatible installation kit (like the ones we reviewed), and ensuring proper venting. While some kits are designed for DIY installation, it often requires specialized tools and knowledge. If you’re unsure, professional installation is highly recommended to prevent leaks, ensure safety, and comply with regulations.

Q5: Can I use an auxiliary diesel fuel tank for gasoline?
A: Most dedicated auxiliary diesel fuel tanks are designed specifically for diesel fuel. Using gasoline in a tank or system designed for diesel can be dangerous and is generally not recommended, as it can compromise the tank’s integrity, seals, and the vehicle’s fuel system. Some tanks, like the RDS 37-gallon, might allow gasoline transfer with a specific method (e.g., siphoning with an electric pump from the top), but direct gravity-feed into a gasoline vehicle is usually not supported or safe. Always check the manufacturer’s specifications.

Q6: What capacity auxiliary diesel fuel tank is right for me?
A: The right capacity depends on your specific needs. Consider your typical travel distance, how often you access fuel stations, and how much space you’re willing to dedicate in your truck bed. For light use or occasional longer trips, a 30-50 gallon tank might suffice. For commercial use, remote jobs, or extensive off-grid travel, a 50+ gallon tank, like the Landrol 58-gallon, might be more appropriate.

Q7: What are the key features to look for in the best auxiliary diesel fuel tanks?
A: When choosing the best auxiliary diesel fuel tanks for your needs, look for:
1. Material & Durability: High-quality aluminum, heavy-gauge steel, or iron with rust-resistant coatings.
2. Capacity: Matches your extended range needs.
3. Compatibility: Ensures the tank or installation kit fits your specific truck make, model, and year.
4. Fuel Type Specificity: Clearly marked for diesel only, unless explicitly stated for multi-fuel.
5. Installation Method: Gravity feed (most common for auxiliary) or pump-fed.
6. Safety Features: Vented cap, valve shut-offs, secure mounting options.
7. Integrated Features: Fuel level sending units, built-in pipes, and vent covers.
8. Brand Reputation: Trusted manufacturers often provide better quality and support.