Best External Fuel Tanks for Diesel Generators
Finding a reliable external fuel tank for your diesel generator is crucial for extended power supply and efficient fuel management. This guide provides a detailed overview of the top-rated diesel generator external fuel tanks available, highlighting key features and capacities to suit various needs. Below is a summary of selected models catering to different generator sizes and fuel demands.
| Product | Capacity | Material | Special Features |
|---|---|---|---|
| POWER PRODUCTS Universal Fuel Tank | 4 Gallons | ABS Material | Chrome Finish, Fits Most 5-7KW Generators |
| Better Built Steel Transfer Fuel Tank | 36 Gallons | Steel | Overfill Restriction, Built-in Baffles |
| VEVOR Portable Diesel Tank 58 Gallon | 58 Gallons | Polyethylene | 12V Electric Transfer Pump, Duplex Filter System |
| RDS MFG INC 45 Gallon Transfer Fuel Tank | 45 Gallons | Steel | Fully Welded Seams, Gasoline Auxiliary Fueling Allowed |
| CreFiTech 58 Gallon Fuel Transfer Tank | 58 Gallons | UV-Resistant Polyethylene | High-Speed 12V Pump, Dual-Stage Filtration |
POWER PRODUCTS Universal 4 Gallon Fuel Tank

The POWER PRODUCTS Universal 4 Gallon Diesel Generator Fuel Tank is made from durable ABS material with a stylish chrome finish. Its compact size of 18″ (L) x 13″ (W) x 5-1/4″ (H) makes it compatible with most open frame 5-7KW diesel generators. This universal tank is ideal for users needing a portable and easy-to-install external fuel option. Its robust build ensures long-lasting service while maintaining a lightweight form for simple handling.
Better Built Steel Transfer Fuel Tank – 36 Gallon

This Better Built Steel Transfer Fuel Tank offers a sizable 36-gallon capacity made with rugged steel ideal for extended generator use. It features an overfill restriction mechanism that stops the pump automatically to avoid spills. Internal baffles add structural integrity and prevent fuel from shifting during transport. Its black rectangular design fits various truck beds and outdoor setups, making it suitable for users needing a durable and safe fuel storage solution.
VEVOR Portable Diesel Tank, 58 Gallons with Pump

The VEVOR 58 Gallon Portable Diesel Tank combines a high-quality polyethylene build with a 12V electric transfer pump that delivers a flow rate of 10.6 gallons per minute, ensuring rapid fuel transfer. Its duplex filtration system purifies diesel by removing large and microscopic impurities, protecting generator engines. The tank’s lockable lid adds theft protection, while its thick material ensures resistance to weather and UV exposure, ideal for heavy-duty and outdoor use.
RDS MFG INC 71083 45 Gallon Transfer Fuel Tank

The RDS MFG INC 45 Gallon Auxiliary Transfer Fuel Tank delivers reliability with fully welded seams and sturdy steel construction. It allows gasoline auxiliary fueling when using an electric fuel pump, providing flexibility. Designed for easy installation in short truck beds, the tank suits users prioritizing durability and versatility, ensuring steady fuel supply for medium to large diesel generators in various applications.
CreFiTech 58 Gallon Fuel Transfer Tank with Pump

Constructed from ultra-durable UV-resistant polyethylene, the CreFiTech 58 Gallon Fuel Transfer Tank offers weather and corrosion resistance. Its 12V high-speed fuel pump delivers diesel at 10.6 GPM for quick refuel cycles. Featuring a dual-stage filtration system, it protects engines by removing both large and microscopic contaminants. The lockable copper lid enhances security during job site use, making it an excellent choice for heavy equipment and generator fueling.
Buying Guide for Diesel Generator External Fuel Tanks
When selecting an external fuel tank for a diesel generator, consider the following key factors:
- Capacity: Choose a tank size that meets your fuel demand and generator runtime. Smaller tanks (4-10 gallons) suit portable generators, while larger options (36-116 gallons) target extended use or multiple refueling cycles.
- Material and Durability: Polyethylene tanks are lightweight, corrosion-resistant, and UV-protected, ideal for outdoor use. Steel tanks offer superior strength but can be heavier and prone to corrosion if not properly coated.
- Fuel Transfer System: Integrated 12V electric pumps with adequate flow rates (around 10 GPM) speed up refueling. Mechanical fuel gauges help monitor levels to prevent unexpected outages.
- Filtration: Advanced filtration systems including duplex filters that remove large and microscopic impurities can prolong generator engine life and efficiency.
- Security Features: Lockable lids prevent theft and unauthorized access, especially in job site environments.
- Compatibility and Fit: Ensure dimensions and mounting options are compatible with your generator frame and vehicle bed if transporting.
- Portability: Consider weight, handles, and design if frequent transportation or repositioning is required.
Assess your specific power needs, environmental conditions, and ease of fuel management to make the best choice for an external diesel fuel tank that supports your generator reliably.