Need extra diesel capacity for towing, long trips, or off-road work? This guide highlights five top auxiliary fuel tanks that balance capacity, durability, and ease of installation. Best for heavy-duty crews, long-haul drivers, and DIY enthusiasts who want reliable fuel storage on the go.
| Product | Capacity | Best For |
|---|---|---|
| RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon | 69 gal | Long trips, heavy towing |
| DEE ZEE DZ92556NSB Transfer Tank | Unknown (varies by model) | Rugged spill-proof transfer |
| VEVOR Portable Diesel Tank, 58 Gallon | 58 gal | Portable fueling, on-site work |
| RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank – 45 Gallon | 45 gal | Compact auxiliary needs |
| RDS MFG INC Fuel Tank – 60-Gallon | 60 gal | Medium-range capacity |
RDS MFG INC Rectangular Auxiliary Fuel Tank — 69 Gallon
Best for drivers needing a large, stationary auxiliary tank. Features include a robust design with fully welded seams and compatibility with top-fuel siphoning via an electric pump. The 69-gallon capacity makes it well-suited for extended trips or work fleets that require steady fuel availability. Best for applications where extra range reduces refueling stops.
Who it’s best for: long-haul operators and fleet users who prioritize high capacity and simple top-fuel access. Why chosen: the 69-gallon size provides substantial range, and the tank’s construction emphasizes durability. Consider any installation space constraints before purchasing.
Limitations: data notes gasoline fueling is allowed when siphoning from the top; verify local regulations and vehicle compatibility before use.
DEE ZEE DZ92556NSB Transfer Tank
Better for durability-focused buyers who want heavy-duty construction. This transfer tank uses 14-gauge steel with radius curves to minimize weld stress and a drain plug for easy emptying. Five stability baffles help manage fuel movement during vehicle motion, making it suitable for trucks and equipment fleets operating on rough terrain.
Who it’s best for: operators who need a rugged steel tank with interior baffles for stability. Why chosen: superior steel construction reduces weld fatigue and improves long-term durability. Caution: steel tanks require proper mounting and rust protection in harsh environments.
VEVOR Portable Diesel Tank, 58 Gallon
Best for on-site fueling and transportability. This portable tank is made from high-quality polyethylene and includes a 12V transfer pump with a 13.1-foot hose, plus a mechanical gauge for monitoring. A lockable lid and a duplex filter system help protect the fuel and reduce contamination risk. The tank is UV-resistant and designed to withstand varying weather conditions.
Who it’s best for: contractors, service fleets, and individuals needing a portable, secure fuel source. Why chosen: portability, lockable lid, and filtration provide a practical, secure refueling solution. Limitation: polyethylene tanks may require careful handling to avoid punctures in rocky environments.
RDS MFG INC 71083 Rectangular Auxiliary/Transfer Tank — 45 Gallon
Choose this if you want a compact, fully welded auxiliary tank with top-fuel siphoning. The 45-gallon size makes it suitable for smaller trucks or vehicles with tighter bed space. The fully welded seams contribute to durability in steady-state installations or frequent fueling routines.
Who it’s best for: owners needing a smaller, durable auxiliary solution. Why chosen: robust welding and compact footprint. Caution: ensure the 45-gallon capacity aligns with your vehicle bed dimensions and mounting points.
RDS MFG INC Fuel Tank — 60-Gallon
Best for balanced capacity and compatibility. A 60-gallon tank fits many mid-size trucks and offers more range than compact options without excessive installation complexity. The tank supports gasoline fueling from the top via an electric pump, a common setup for auxiliary deployments.
Who it’s best for: users who want ample capacity with moderate installation demands. Why chosen: reliable mid-range capacity and familiar fueling method. Limitation: verify bed width and mounting compatibility before ordering to prevent fit issues.
Buying Guide
- Capacity needs: Choose a tank size that matches typical trip lengths and refueling intervals. Larger tanks reduce stops but require more space and heavier installation.
- Material and durability: Steel tanks excel in heavy use but require rust protection; plastic/poly tanks are lighter and UV-resistant but may be less durable in impact-prone environments.
- Mounting and fit: Measure bed width, clearance under wheel wells, and mounting points before ordering. Some models are designed for specific trucks or bed configurations.
- Fuel type compatibility: Ensure the tank supports your intended fuel type and whether gasoline fueling is allowed via top siphoning, if relevant to your setup.
- Accessories: Look for integrated features like locking lids, baffles for stability, drain plugs, and built-in filters or gauges for easier monitoring.
- Portability vs. stationary use: Portable tanks shine on job sites and for responders, while stationary auxiliary tanks suit long-haul setups with fixed mounting.
- Installation considerations: Some tanks require professional mounting due to wiring, venting, and safety requirements. Check for clear installation instructions.
Frequently Asked Questions
- What capacity should I choose for an auxiliary diesel tank? – Choose based on typical travel distance, fueling frequency, and your vehicle’s space for mounting. Long trips benefit from larger tanks; shorter trips can use smaller ones.
- Do these tanks require professional installation? – It depends on the vehicle, mounting area, and fuel system. Some setups are DIY-friendly, while others may require professional installation.
- Can I siphon fuel from the top of the tank? – Some models support top-fuel siphoning with an electric pump. Verify compatibility with your chosen model and ensure proper safety practices.
- Are there safety concerns with portable diesel tanks? – Yes. Ensure proper secure mounting, venting, and locking mechanisms. Use approved hoses and guard against heat sources and impact damage.
- What maintenance is needed for diesel tanks? – Regularly inspect for leaks, clean filters, and monitor fuel levels. For steel tanks, protect against rust and corrosion.
- Which tank is best for off-road use? – Tanks with robust welds, thicker materials, and protective features (like baffles and secure lids) are preferable for off-road conditions.