We researched and compared the leading dual fuel conversion kits for generators, evaluating them against manufacturer specifications, published safety standards, and aggregated owner feedback from hundreds of verified purchases. Our goal is to help you select the kit that best matches your generator model, fuel preference, and installation comfort level.
Each kit allows your gasoline generator to run on propane or natural gas, offering fuel flexibility, longer storage life, and cleaner burning. We focused on compatibility, ease of installation, included components, and real-world performance reported by owners.
| Photo | Product | Score | Buy |
|---|---|---|---|
 |
US Carburetion Dual Fuel Conversion Kit Top Pick Compatible with most generators up to 20 HP; includes demand regulator, gas hose, and fittings. |
9.0 | 🛒 Check Price |
 |
Century Fuel Products Dual Fuel Conversion Kit Best Value Fits generators from 5 to 15 HP; includes adjustable regulator and brass fittings. |
8.7 | 🛒 Check Price |
 |
Northeast Dual Fuel Conversion Kit Easiest Install Designed for generators with a standard 3-bolt carburetor; includes pre-assembled gas line. |
8.4 | 🛒 Check Price |
|
Vevor Dual Fuel Conversion Kit Budget Friendly Fits 4-20 HP engines; includes regulator, hose, and brass adapters. |
7.8 | 🛒 Check Price |
|
🚗
|
DuroMax Dual Fuel Conversion Kit Brand Specific Specifically designed for DuroMax generators XP series; includes fuel selector valve. |
8.1 | 🛒 Check Price |
|
GasBuster Dual Fuel Conversion Kit Compact Design Compact regulator and hose kit for small portable generators (3-8 HP). |
7.5 | 🛒 Check Price |
|
🚗
|
Propane Generators Dual Fuel Conversion Kit Heavy Duty Heavy-duty brass regulator and steel braided hose for high-output generators (up to 20 HP). |
8.2 | 🛒 Check Price |
1. US Carburetion Dual Fuel Conversion Kit: Top Pick
The US Carburetion kit is widely regarded as the gold standard in dual fuel conversion. In our research, it was the most frequently recommended by generator owners and small engine mechanics. The included demand regulator is the same model used in many factory dual-fuel generators, ensuring consistent fuel delivery whether you run on propane or natural gas. Installation is straightforward for anyone comfortable with basic hand tools, and the kit includes a detailed manual with model-specific guidance.
However, we found that some older generators with integrated carburetor fuel bowls may need a separate purchase of a compatible carburetor or adapter plate. This kit is best for owners who want a proven, long-lasting solution and are willing to invest a bit more time in installation. If you have a very small portable generator (under 3 kW) or prefer a plug-and-play solution, you might want to consider a kit with a simpler mounting bracket.
- Proven design used by many generator manufacturers for factory dual fuel models.
- Includes a high-quality demand regulator that maintains consistent fuel pressure.
- Comes with clear instructions and all necessary hardware for a straightforward installation.
Pros: Reliable performance across a wide range of generator brands.; Regulator is rebuildable, extending kit lifespan.
Cons: May require minor carburetor modifications on some older generator models.
2. Century Fuel Products Dual Fuel Conversion Kit: Best Value
Century Fuel Products offers a well-rounded kit that balances cost and capability. The adjustable regulator is a standout feature, allowing you to dial in the exact fuel mixture for your generator’s engine. In owner feedback, many reported improved efficiency and smoother idle after adjustment. The brass fittings are a nice touch, adding corrosion resistance and longevity compared to standard steel components.
On the downside, the instruction manual is somewhat sparse, and some owners noted that the mounting bracket didn’t perfectly align with their generator’s frame, requiring minor drilling. This kit is a strong choice for budget-conscious buyers who are comfortable with a little DIY customization. If you want a truly tool-free installation, look for a kit with a universal bracket that uses existing bolts.
- Adjustable regulator allows fine-tuning of fuel pressure for optimal performance.
- Brass fittings resist corrosion and ensure a leak-free connection.
- Includes a simple mounting bracket that fits most generator frames.
Pros: Excellent value for the feature set.; Adjustable regulator helpful for fine-tuning on different generators.
Cons: Instructions could be more detailed for first-time installers.
3. Northeast Dual Fuel Conversion Kit: Easiest Install
The Northeast kit prioritizes simplicity. The pre-assembled gas line and quick-connect fittings mean you can have the kit installed in under an hour, as reported by many owners. The universal mounting plate is designed to fit the most common 3-bolt carburetor pattern found on many Honda and clone engines. The illustrated manual is one of the best in the category, with clear diagrams and torque specifications.
However, compatibility is narrower than some competitors. If your generator uses a 4-bolt carburetor or an unusual layout, this kit won’t work without modifications. Also, the regulator is non-adjustable, so you may need to adjust your carburetor’s main jet for optimal performance. This kit is perfect for users who want a fast, no-hassle conversion on a compatible generator. Skip it if you have an oddball engine or want fine-tuning capability.
- Pre-assembled gas line with quick-connect fittings reduces installation time.
- Includes a universal mounting plate that attaches to existing carburetor bolts.
- Comes with a clear, illustrated manual that walks through each step.
Pros: Very easy to install, even for beginners.; Quick-connect fittings make switching between fuel sources simple.
Cons: Not compatible with all carburetor bolt patterns; check your generator first.
4. Vevor Dual Fuel Conversion Kit: Budget Friendly
Vevor’s kit is the most budget-oriented option in our lineup. It includes all the basics: a regulator, hose, and brass adapters for both fuel types. For the price, it’s a solid entry point for those who want to experiment with dual fuel without a large investment. Many owners reported successful installations on small to mid-size generators.
However, we found mixed feedback on regulator reliability. Some units delivered steady pressure, while others caused surging or hard starting. The instruction manual is minimal, and the components feel less robust than premium kits. This kit is best for experienced DIYers who can troubleshoot minor issues and want to save money. If you rely on your generator for critical power backup, we recommend investing in a higher-quality kit.
- Very affordable price point for a full kit.
- Brass adapters included for both propane and natural gas connections.
- Lightweight components reduce strain on generator frame.
Pros: Lowest cost option for entry-level users.; Includes adapters for both propane and natural gas.
Cons: Regulator quality is inconsistent; some units have reported pressure fluctuations.
5. DuroMax Dual Fuel Conversion Kit: Brand Specific
If you own a DuroMax XP series generator, this kit is the obvious choice. It’s designed to integrate seamlessly with the existing fuel system, and the included fuel selector valve mounts neatly on the generator’s control panel. Owner feedback highlights the ease of installation and reliable operation, with many reporting no need for carburetor adjustments.
The downside is that this kit is not universal. It won’t fit other brands or even older DuroMax models. Also, the price is higher than universal kits, reflecting the brand-specific engineering. This kit is ideal for DuroMax owners who want a hassle-free conversion. If you have a different generator brand, look at the universal options above.
- Factory-engineered for DuroMax XP generators, ensuring perfect fit.
- Includes a fuel selector valve for easy switching between gasoline and propane.
- Uses OEM-grade hoses and fittings for long service life.
Pros: Guaranteed compatibility with DuroMax XP series.; Fuel selector valve simplifies operation.
Cons: Only works with DuroMax XP generators; limited versatility.
6. GasBuster Dual Fuel Conversion Kit: Compact Design
The GasBuster kit is tailored for small portable generators, such as those used for camping or tailgating. The compact regulator can be mounted in tight spaces, and the flexible hose routes easily around obstacles. Owners of smaller generators (3-8 HP) reported that the kit fit well and improved fuel efficiency.
However, the hose is relatively short, which may be an issue for larger generators where the regulator needs to be mounted farther from the carburetor. Also, the regulator is not adjustable, and some users noted a slight power drop when running on propane. This kit is a good match for those with a small generator who prioritize a compact installation. If you have a larger standby generator, you’ll want a kit with a longer hose and adjustable regulator.
- Small footprint regulator fits tight engine compartments.
- Flexible rubber hose with pre-installed brass fittings.
- Includes a mounting bracket that uses existing generator bolts.
Pros: Designed for small generators where space is limited.; Lightweight and easy to store with the generator.
Cons: Hose length may be too short for larger generator frames.
7. Propane Generators Dual Fuel Conversion Kit: Heavy Duty
The Propane Generators kit is built for heavy-duty use. The brass regulator and steel braided hose are noticeably more robust than the plastic and rubber components found in many kits. Owners of larger generators (10-20 HP) reported that the kit handled high fuel demands without pressure drop, and the test port allowed them to verify a leak-free installation.
The trade-off is weight and bulk. The regulator is larger and the steel hose is less flexible, making installation in tight spaces more challenging. The price is also higher than average. This kit is best for those with a large generator who prioritize durability and safety features. If you have a small, lightweight generator, the extra bulk may be unnecessary.
- Brass regulator with large diaphragm for stable fuel delivery at high flow rates.
- Steel braided hose resists abrasion and kinking.
- Includes a high-pressure test port for leak checking.
Pros: Very durable construction suitable for frequent use.; Test port adds an extra safety check.
Cons: Heavier and bulkier than other kits.
Frequently Asked Questions
Will a dual fuel conversion kit work on any generator?
No, not all generators are compatible. Most kits work with generators that have a standard carburetor and a mechanical fuel pump or gravity-fed system. Generators with electronic fuel injection (EFI) or those that are very old may require specialized kits. Always check the kit’s compatibility list before purchasing.
Can I run my generator on natural gas with a dual fuel conversion kit?
Yes, most dual fuel conversion kits support both propane and natural gas. However, natural gas has a lower BTU content per cubic foot, so the generator may produce slightly less power (about 10-15% reduction) compared to propane. You may need to adjust the regulator or carburetor for optimal performance.
Is it safe to install a dual fuel conversion kit myself?
Yes, with proper precautions. The installation involves connecting fuel lines and a regulator, which requires basic mechanical skills. However, you must ensure all connections are leak-tight and use thread sealant where specified. If you are uncomfortable working with fuel systems, we recommend professional installation.
Will using propane or natural gas damage my generator engine?
No, propane and natural gas burn cleaner than gasoline, leaving less carbon buildup and extending engine life. However, the engine may run slightly hotter on propane, so ensure your generator has adequate cooling. Most modern generators can safely run on dual fuel with a properly installed kit.
Do I need to adjust the carburetor after installing a dual fuel conversion kit?
Often yes. Propane and natural gas have different air-fuel ratios than gasoline. Many kits include an adjustable regulator to fine-tune the mixture. If your generator runs rough or surges, you may need to adjust the carburetor’s main jet or idle mixture. Some kits are designed to work without adjustment, but results vary.
Our Verdict
After comparing specifications, owner feedback, and safety considerations, our top pick is the US Carburetion Dual Fuel Conversion Kit for its proven reliability, rebuildable regulator, and broad compatibility. For budget-conscious buyers, the Century Fuel Products kit offers excellent value with its adjustable regulator. Both kits represent the best balance of performance and ease of use for most generator owners.
