Best Auxiliary Fuel Tank for Generator for Reliable Power on the Go
Answering the question with clear guidance: the best auxiliary fuel tanks for generators balance capacity, venting, compatibility, and portability. The top picks here are suited for home backup generators, travel generators, and camping setups. Each product is evaluated for who it best serves, with practical notes on limits. The list includes EPA/CARB-compliant containers, built-in gauges, and vented caps to reduce vapor buildup. This helps you plan longer runtimes and safer refueling in fuel-sensitive environments.
| Product | Capacity | Best For | Key Benefit |
|---|---|---|---|
| Attwood 8806LP2 | 6 gal | Compact setups, boat-to-generator use | Built-in vacuum vent cap, EPA/CARB compliant |
| Scepter 08668 | 12 gal | Longer runtimes, portable boating | 2-way vented cap, built-in gauge |
| JJing Universal 5 Gal | 5 gal | Honda/Predator/Etc. generators | Includes gauge and grommets, note on vent |
| VEVOR 14.53 Gal | 14.53 gal | High-capacity, outboard or yacht use | Visible gauge, long hose included |
| HaTur 5 Gal | 5 gal | Compact, generator with 2 kW-3 kW | Durable iron build, vented valve option |
Attwood 8806LP2 Epa Certified 6 Gallon Portable Fuel Tank
The Attwood 8806LP2 is a compact, EPA and CARB-certified tank designed for lightweight, portable fuel needs. It features a built-in vacuum valve cap that eliminates the need for manual venting, reducing user steps during refueling. This tank is ideal for small generators used in RVs or on boats where space is at a premium. Best for buyers who prioritize simple venting, regulatory compliance, and a lightweight transfer solution for shorter runs.
Best for: users who want a small, easy-to-maneuver option with minimal venting requirements. Limitations: 6 gallons may be insufficient for long runtimes on larger generators, so plan refueling intervals accordingly.
Scepter 12 Gallon Portable Marine Gas Can
The Scepter 08668 tank offers a roomy 12-gallon capacity with a two-way vented cap that allows airflow during refueling while automatically relieving pressure above 5 PSI to prevent vapor buildup. It includes a built-in fuel gauge, a practical feature for keeping track of remaining fuel without opening the container. It’s well-suited for longer outings or generators with higher fuel demands, especially on larger boats or remote setups.
Best for: users needing more capacity with reliable venting and a built-in gauge. Limitation: larger footprint means less portability in tight spaces or compact vehicles.
JJing Universal 5 Gallon Generator Gas Fuel Tank
The JJing 5-gallon tank is designed for compatibility with a range of popular generators (Honda EC2500, Predator, Champion, Duromax, Wen, Power, Homelite, Husky, and more). It includes an in-telt gauge and rubber grommets, which helps with secure mounting and level checks. Note: this model does not include a vent valve, so it’s best for generators that do not require vented operation. It’s a solid pick for buyers who need a straightforward, gauge-equipped tank and are operating in environments where venting is not a concern.
Best for: generators that do not require vented fuel canisters and for buyers who want built-in gauge visibility. Caution: it does not include a vent valve, so verify your generator’s venting needs before purchase.
VEVOR Marine Tank 14.53 Gallon
The VEVOR marine tank brings a high-capacity option with 14.53 gallons (55 liters) and a long 9.8-foot hose, plus a two-way vent cap and a visible gauge. The tank is made from high-density polyethylene and is designed to resist aging, impact, and corrosion. A gauge helps monitor fuel levels, and the separate inlet and outlet channels minimize spills. It’s best for longer trips, larger boats, or when constant generator fueling is needed away from shore power, but avoid prolonged sunlight exposure to limit aging.
Best for: users needing a large fuel supply and a clear gauge for accurate monitoring. Limitation: exposure to direct sun can accelerate aging, so cover or store when not in use.
HaTur Generator Gas Fuel Tank 5 Gallons
The HaTur 5-gallon tank is designed for compact generators with a 2 kW to 3 kW output. It is made of durable iron with a plated surface to resist rust and has dimensions that fit smaller generator setups. This option is best for buyers needing a sturdy, compact fuel tank for smaller portable generators. Note: the description emphasizes durability but does not specify venting features, so verify vent requirements for your unit.
Best for: small, portable generator users who want a rugged, compact tank. Caution: verify venting compatibility if your generator requires vented operation.
Buying Guide: What To Consider When Choosing an Auxiliary Fuel Tank
- Capacity: Match tank size to generator runtime and fuel availability. Higher capacity reduces refueling frequency but increases weight and storage space needs.
- Ventilation: Vent caps vary by model. Some include two-way venting or built-in pressure relief, while others lack vents. Choose based on your generator’s fuel system and the risk of vapor buildup.
- Compatibility: Check that the tank is compatible with your generator’s fuel type and mounting options. Some tanks support various makes, while others are designed for specific models.
- Fuel gauge: A built-in gauge helps you monitor fuel without opening the tank, reducing spills and exposure to fumes.
- Material and durability: Polyethylene tanks resist corrosion and are lightweight, but metal tanks may offer added durability. Consider climate exposure and storage conditions.
- Portability and mounting: Consider how you’ll transport and mount the tank. Larger tanks offer more capacity but require more space and secure mounting.
- Regulatory compliance: EPA and CARB certifications indicate adherence to emission standards, which can be important for certain environments.
- Avoid common pitfalls: Always check dimensions, especially for portable setups. Some listings note capacity slightly below nominal amounts; confirm actual capacity if precise measurements matter for your use case.
Frequently Asked Questions
- What is an auxiliary fuel tank for a generator?
An auxiliary fuel tank provides additional fuel capacity to extend run times between refuels, especially when running a generator away from a primary fuel source.
- How do vented caps improve safety?
Vented caps allow air to escape as fuel expands, reducing pressure buildup and preventing vapor-related hazards during fueling.
- Is a built-in fuel gauge important?
Yes. A built-in gauge helps you monitor fuel levels without opening the tank, minimizing spills and exposure to fumes.
- Can I use any tank with any generator?
Not always. Check compatibility with your generator’s fuel type, mounting, and venting requirements to avoid fit or operation issues.
- Which tank is best for long camping trips?
A higher-capacity model, like the 12-gallon or 14.53-gallon tanks, is better for long runtimes, provided you have space to store and transport them safely.
- Do EPA or CARB certifications matter?
They indicate compliance with emissions regulations, which can matter for use near regulated areas or in boats and RV parks that require compliance.