When choosing an auxiliary fuel tank for gasoline, select options designed to safely store and transfer fuel while fitting your vehicle’s bed or chassis. This guide highlights five credible choices, focusing on capacity, durability, and ease of use. Best for pickups with long-distance needs, work trucks, or off-road setups, these tanks balance size, rugged construction, and practical features. The following table summarizes each option to help you compare at a glance.
| Product | Capacity | Best For |
|---|---|---|
| RDS MFG INC 71083 Rectangular Auxiliary/Transfer Fuel Tank | 45 Gallons | Compact setups, daily drivers needing extra range |
| RDS MFG INC Fuel Tank – 60-Gallon | 60 Gallons | Mid-size trucks, long trips, versatile mounting |
| Dee Zee DZ92556NSB Transfer Tank | Unknown (Heavy Duty 14-Gauge Steel | Durable metal option for demanding applications |
| RDS MFG INC – 72548 Fuel Transfer Tank/Combo | 60 Gallons | Toolbox combo, organized fuel access |
| RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon | 69 Gallons | High-capacity needs, long off-road runs |
RDS MFG INC 71083 Rectangular Auxiliary/Transfer Tank

The 45-gallon rectangular design provides a balanced footprint for smaller trucks or SUVs that still need extra gasoline range. Key features include fully welded seams for durability and the ability to siphon gasoline from the top using an electric fuel pump. Best for drivers who need a dependable, space-efficient auxiliary tank without excessive weight. Caution: verify compatibility with your bed or mounting configuration before purchase.
RDS MFG INC Fuel Tank – 60-Gallon

This 60-gallon tank suits mid-size trucks and offers flexible mounting options. It supports gasoline auxiliary fueling via top-siphon with an electric pump, enabling quick transfers. Best for owners seeking higher capacity without moving to oversized tanks. Choose this if you drive longer routes and need more fuel without frequent refueling stops. Limitation: measure bed space to ensure proper fit before ordering.
Dee Zee DZ92556NSB Transfer Tank

Dee Zee offers heavy-duty steel construction with 14-gauge walls and curved radii to reduce weld stress. The tank includes multiple stability features like internal baffles and a drain plug for maintenance. Best for buyers prioritizing rugged construction and long-term durability in harsh conditions. Limitation: heavier build may require stronger mounting hardware and vehicle support.
RDS MFG INC – 72548 Fuel Transfer Tank/Combo

This 60-gallon option combines a fuel transfer tank with a toolbox, offering organized access to fuel and storage. Designed for auto accessories, with dimensions suitable for various installations. Best for users who want an integrated toolbox experience and easy fuel handling. Caution: verify the toolbox dimensions against your mounting space.
RDS MFG INC Rectangular Auxiliary Fuel Tank – 69 Gallon

The 69-gallon tank maximizes capacity for extended trips or heavy-duty use. It follows RDS’s standard approach of top-siphon fueling via an electric pump, and lists overall dimensions that help in planning mounting space. Best for drivers needing the highest capacity among the five selections, while staying within a manageable size. Limitation: larger footprint requires adequate mounting clearance and bed space.
Buying Guide: Key Considerations For Auxiliary Fuel Tanks
- Capacity vs. space: Match tank capacity to your typical range and available mounting area. Higher gallons increase range but require more space and weight.
- Material and durability: Steel tanks offer rugged durability but may be heavier; aluminum tanks resist corrosion and can be lighter.
- Fuel transfer method: Top-siphon with an electric pump is common; ensure pump compatibility with your vehicle and fuel line needs.
- Mounting and fit: Check bed dimensions, bed rails, and mounting points. Some tanks are designed as toolbox combos for integrated storage.
- Safety features: Look for welded seams, baffling, and drain plugs to ease maintenance and reduce fuel slosh.
- Maintenance and corrosion resistance: Aluminum variants resist rust; steel may require protective coatings in harsh environments.
Frequently Asked Questions
- What should I consider when choosing an auxiliary fuel tank?
Answer: Capacity, mounting fit, material durability, transfer method, and whether you need additional toolbox storage. - Is a larger tank always better for long trips?
Answer: Not always; weigh capacity against vehicle weight, space, and balance for handling. - Can I install an auxiliary tank in a standard pickup bed?
Answer: Many tanks are designed for truck beds; verify bed width, length, and mounting provisions before purchasing. - What is the advantage of a toolbox/fuel transfer combo?
Answer: It consolidates storage and fuel access, simplifying organization and refueling operations. - Are there safety concerns with auxiliary tanks?
Answer: Proper mounting, venting, and secure fuel lines reduce leakage and incidents; follow manufacturer instructions.