Ever been in the middle of a long haul or deep in the backcountry when your fuel gauge dips dangerously low? That sinking feeling is real, especially when you rely on diesel power for your truck, RV, or equipment. Finding a place to refuel when you need it most can turn a great trip into a major headache.
Choosing the right Auxiliary Diesel Fuel Tank adds another layer of stress. Should you pick a metal or plastic tank? How big should it be? What about safety and legal rules? Getting it wrong means wasted money, unsafe setups, or simply not having the extra range you desperately need. It feels like a complicated puzzle with a lot of pieces.
This guide cuts through the confusion. We will break down everything you need to know about auxiliary diesel tanks. By the end, you will understand the key features, know how to match a tank to your needs, and gain the confidence to choose the perfect solution for extended range. Let’s dive into making sure your engine keeps running smoothly, no matter how far you travel.
Top Auxiliary Diesel Fuel Tank Recommendations
- 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
- Robust Tank Construction: Color: Black. Our portable diesel tank is constructed of high-quality polyethylene material, capable of handling changing weather conditions, and resists UV radiation. The upper lid is lockable by a copper lock that guards against theft and makes sure the security of operation. Put your tank first and get the job done right. The thickness is 6mm, and the thickest part can reach 12mm.
- 58 Gallon Efficient Refueling: Flow Rate: 10.6 GPM; Output Power: 140W. 12V transfer pump provides strong power to deliver fuel from the tank to your vehicles in high efficiency. We adopt a mechanical fuel gauge aimed to monitor the capacity of diesel in time, reminding you to fill up in time. Safety fill capacity is 52 Gal. Maximum fill capacity is 58 Gal.
- Upgraded Filter Design: Compared with others products, Our fuel transfer tank is equipped with a duplex filter to offer purer diesel. The front-end filter of the inner tank can separate large particles of impurities, and the premium outer filter is designed to filtrate small impurities such as metal, colloids, tiny particles, etc.
- Automatic Fueling Nozzle: Are you tired of overfilling your tank? Well, this fuel nozzle will shut off automatically when the tank is full, which efficiently avoids oil waste and spillage. In addition, the rotatable adapter has been improved to help the hose get of knotting. Made of premium aluminum alloy and PVC material, our nozzle has a smooth surface finish and a long service time.
- Transport with Ease: The two grooves make this diesel tank easy and secure to transport. And the integrated forklift pocket design ensures stable lifting onto a vehicle. Thanks to these wonderful designs, our diesel tank is widely used in trucks, tractors, ships, motorhomes, outdoor industries, construction industries, etc. Start up your engine and get ready to work!
- 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
- Fits some short beds; please measure before ordering
- Cannot be used to transfer gasoline to another vehicle
- 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
- Package Dimensions: 57.0 " L x 18.0 " W x 16.0 " H
- Package Weight: 43.545 kilograms
- 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
- 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
- Fully welded seams for durability
- Aluminum Tank - NO RUSTING
- Heavy Duty 14-Gauge Steel
- Radius Curve Eliminates Weld Pressure Points
- 5 Stability Baffles and Drain Plug
- Mounting Tabs to Secure to the Truck Bed
- 42 Gallon Capacity
- 45-Gallon High-Capacity Design - This upright hydraulic oil reservoir provides ample fluid storage, ensuring stable operation even in intensive working scenarios
- Lightweight & Heat-Efficient Aluminum Construction - Crafted from high-quality, corrosion-resistant aluminum, the tank reduces overall equipment weight while dissipating heat efficiently. Its natural finish enhances durability, making it suitable for harsh working conditions and ensuring long-term reliable performance of the hydraulic system
- Space-Saving Upright Design & Enhanced Performance - Fully baffled design prevents fluid turbulence, optimizes oil cooling and flow, and maintains consistent hydraulic pressure for heavy-duty applications
- Durable & Universal Fit - Features a rugged, stylish natural aluminum finish that combines durability with a professional look, ideal for commercial trucks and trailers
- Complete Fuel Tank Kit - The all-in-one kit eliminates the need for additional purchases, enabling quick, secure installation and long-lasting performance for hydraulic truck systems
Your Essential Guide to Buying an Auxiliary Diesel Fuel Tank
Adding an auxiliary diesel fuel tank to your truck or equipment significantly extends your travel range. This guide helps you pick the right one for your needs.
Key Features to Look For
When shopping for an auxiliary tank, several features make a big difference in how well it works and how long it lasts.
Capacity and Size
- Tank Volume: Decide how much extra fuel you need. Bigger tanks offer more range but take up more space. Measure your truck bed or mounting area first.
- Footprint: Ensure the tank dimensions fit securely without blocking your view or interfering with your truck’s tailgate.
Safety and Compliance
- DOT/ADR Compliance: Check if the tank meets Department of Transportation (DOT) or European Agreement concerning the International Carriage of Dangerous Goods by Road (ADR) standards. This is crucial for legal road use.
- Baffling: Look for internal baffles. These metal plates stop fuel from sloshing around violently when you drive. Baffling improves safety and tank longevity.
Fuel Transfer System
- Pump Quality: The included pump must be strong enough for diesel. Look for pumps rated for high flow rates (GPM) and those with a good warranty.
- Hose Length: A long, durable hose lets you reach the fill port easily, even on large equipment.
Important Materials and Construction
The material your tank is made from directly affects its strength and resistance to rust.
Aluminum vs. Steel
- Aluminum: This is a popular choice. Aluminum tanks weigh less, which helps your truck’s payload capacity. They resist rust very well.
- Steel: Steel tanks are often tougher against physical impacts. However, they need a good protective coating to prevent internal and external rust, especially when holding diesel.
Weld Quality
Examine the welds carefully. Strong, clean welds prevent leaks under pressure or vibration. Poor welding greatly reduces the tank’s lifespan.
Factors That Improve or Reduce Quality
Quality isn’t just about the material; it’s about the design.
Quality Boosters
- Drain Plugs: A well-placed drain plug at the bottom helps you empty water or sediment from the tank easily.
- Ventilation System: Good tanks have proper venting to allow air in as fuel leaves, preventing a vacuum.
Quality Reducers
- Cheap Fittings: Plastic fittings or low-quality hose connectors often fail first. Always prefer brass or steel fittings.
- Thick Coatings (Steel Tanks): While coatings protect steel, a coating that is too thick or unevenly applied can chip off, leading to uneven corrosion spots.
User Experience and Use Cases
How you plan to use the tank shapes your best choice.
Common Use Cases
- Long-Haul Trucking: Drivers need large capacity and DOT compliance for legal over-the-road travel.
- Construction/Farming: These users often need portable tanks to refuel equipment like excavators or tractors directly on site, prioritizing ruggedness and easy pump access.
Installation Ease
Consider how the tank mounts. Some tanks use simple straps, while others require custom mounting brackets. Read reviews to see how difficult installation was for other buyers.
Frequently Asked Questions (FAQ)
Q: Is it legal to carry extra diesel fuel on the road?
A: Yes, but the tank must meet specific safety standards, usually DOT regulations in the US. Always check your local laws before traveling.
Q: Can I use an auxiliary tank meant for gasoline with diesel fuel?
A: No. You must use a tank specifically rated for diesel. Diesel tanks often have different venting and material requirements.
Q: What is baffling and why is it important?
A: Baffles are internal walls inside the tank. They stop the fuel from moving too much when you brake or turn sharply. This keeps the fuel stable and protects the tank structure.
Q: How often should I drain my auxiliary tank?
A: If you store fuel for many months, you should drain it once a year, or whenever you notice water collecting at the bottom via the drain plug.
Q: Do auxiliary tanks affect my truck’s warranty?
A: Installing aftermarket fuel systems can sometimes void warranties related to the fuel system. Consult your vehicle manufacturer first.
Q: What is the difference between a transfer tank and a storage tank?
A: A transfer tank is designed to be mounted in a truck bed and used to move fuel to other equipment. A storage tank is usually stationary, meant only for holding fuel at a fixed location.
Q: Should I buy a tank with an electric pump or a manual one?
A: Electric pumps are much faster and easier for transferring large amounts of fuel. Manual pumps are simpler and cheaper but require more physical work.
Q: Does an aluminum tank need internal coating?
A: Generally, no. Aluminum does not rust like steel. However, a coating might be used to protect against certain additives or contamination.
Q: How does the tank size relate to my truck’s payload limit?
A: Fuel is heavy—diesel weighs about 7 pounds per gallon. A 100-gallon tank adds 700 pounds plus the tank’s weight. You must subtract this from your truck’s maximum payload capacity.
Q: Can I use a gas station pump to fill my auxiliary tank?
A: Yes, most auxiliary tanks are designed to be filled safely using standard fuel station nozzles, provided the fill neck size matches the nozzle.