Best External Fuel Tanks for Generators
When it comes to powering your generator efficiently with extended run times, choosing the right external fuel tank is crucial. External fuel tanks provide additional fuel capacity and convenience to keep your generator running longer without interruption. Below is a summary table featuring some of the best-selling external generator fuel tanks and fuel solutions available on Amazon, including critical compatibility and capacity details.
| Product Name | Brand | Fuel Capacity | Compatibility |
|---|---|---|---|
| JMCHstore OEM Metal Generator Gas Fuel Tank | JMCHstore | 7.2 Gallons | Generac GP and RS Series 5-8kW generators |
| maXpeedingrods 12V DC Gasoline Electric Fuel Pump | maXpeedingrods | Requires Separate Fuel Tank | Compatible with external tanks for continuous running |
| JJing Universal 7 Gallon Generator Gas Fuel Tank | JJing | 7 Gallons | Honda EC and EM series & other generators |
| Automost 7 Gallon Universal Generator Gas Tank | Automost | 7 Gallons | Honda EB & EM Series, Predator 6500-9000 |
| Sportpules Universal 5 Gallon Gas Tank for Generator | Sportpules | 5 Gallons | Generators, lawn equipment, gasoline-powered tools |
JMCHstore OEM Metal Generator Gas Fuel Tank for Generac Generators

This 7.2-gallon metal fuel tank from JMCHstore is designed for Generac GP and RS series portable generators between 5kW and 8kW models. The tank fits multiple models including GP5500, GP6500, RS5500, RS7000E, and XT8000E, making it a solid replacement or upgrade for extended use. Its robust metal construction ensures durability, and the direct OEM compatibility simplifies installation without modifications. Ideal for Generac users looking to prolong runtime with a reliable external gas tank.
maXpeedingrods 12V DC Gasoline Electric Fuel Pump

The maXpeedingrods fuel pump features an automatic fuel level sensor that continuously monitors fuel levels and pumps gasoline from an external tank to your generator without leaks. This ensures extended running time by eliminating generator shutdowns during refueling. Its quick connect fuel port facilitates easy and reliable connection to a compatible external fuel tank (sold separately). This pump is excellent for owners needing continuous fuel delivery with precise control and minimal manual operation.
JJing Universal 7 Gallon Generator Gas Fuel Tank for Honda and More

This universal 7-gallon gas tank from JJing supports a wide range of generators, including popular Honda EC and EM series models. It features built-in fuel gauge and rubber grommets for ease of use. Be aware this tank lacks a vent valve, which can be a consideration depending on your generator’s requirements. Always check the mounting sizes carefully before purchase, as some customers report returns due to improper fit. Its metal build offers dependable fuel storage for prolonged generator operation.
Automost 7 Gallon Universal Generator Gas Tank Compatible with Honda

The Automost tank offers a 7-gallon capacity and compatibility with Honda EB and EM series and Predator generators ranging from 6500 to 9000 watts. Made with sturdy iron and finished with a paint baking process, it resists rust and damage. Included accessories such as fuel petcock, air filter, fuel line, and mounting hardware provide a complete replacement set. This tank combines durability with comprehensive assembly components for hassle-free installation.
Sportpules Universal 5 Gallon Gas Tank for Generator

This 5-gallon high-density polyethylene tank from Sportpules is designed for portable fuel storage with generators, lawn equipment, or other gasoline-powered tools. Its durable plastic construction withstands impacts and rough handling without damage. Accessories are conveniently stored under the tank cap for easy access. This lightweight and portable tank is ideal for those needing a smaller fuel reservoir with versatility across various gasoline-powered devices.
Buying Guide for External Generator Fuel Tanks
Choosing the best external fuel tank for your generator involves several key considerations to ensure compatibility, safety, and extended runtime. Here are the primary factors to evaluate:
Capacity and Size
The fuel tank capacity directly affects how long your generator can run uninterrupted. Common sizes range from 5 to 7+ gallons. Verify dimensions and mounting holes to ensure the tank fits your generator model and installation space.
Compatibility
Check the tank’s compatibility with your generator brand and model. OEM or brand-specific tanks like JMCHstore for Generac or Automost for Honda generators provide a seamless fit and easier installation. Universal tanks offer flexibility but require careful measurement.
Material and Durability
Fuel tanks are typically made from metal or high-density polyethylene (plastic). Metal tanks offer rugged durability but are heavier, while plastic tanks are lightweight and impact-resistant but may have lower longevity. Select based on your generator use environment.
Ventilation and Safety Features
Some tanks include vent valves or fuel gauges for monitoring fuel levels and preventing pressure buildup. Absence of vent valves can cause operational issues or returns if not compatible with your generator. Confirm such features before purchasing.
Accessories and Installation
A complete fuel tank package often includes petcocks, fuel lines, filters, grommets, and mounting hardware. These accessories facilitate straightforward installation and maintenance, saving time and hassle. Consider tanks with comprehensive kits.
Fuel Delivery Options
For continuous operation, fuel transfer pumps like the maXpeedingrods 12V automatic electric fuel pump can enhance fuel supply from large external tanks without shutting the generator off. Ensure your setup supports compatible pump connections.
By evaluating these considerations, you can select the best external fuel tank that suits your generator model, usage needs, and installation preferences, ensuring reliable power delivery for extended periods.