Converting a natural gas vehicle to run on propane can improve fuel availability and performance. We researched and compared the top conversion kits on the market, analyzing manufacturer specifications, safety standards, and aggregated owner feedback. Our evaluation focuses on performance, durability, ease of installation, and safety compliance. Below are our findings to help you choose the right kit for your vehicle.
| Photo | Product | Score | Buy |
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Techtron Elite NG to LPG Conversion Kit Best Overall Compatible with most CNG vehicles, includes ECU and pressure regulator |
9.1 | 🛒 Check Price |
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ProPac CNG to Propane Conversion System Best Value Universal fit for 4-6 cylinder engines, includes vaporizer and mixer |
8.5 | 🛒 Check Price |
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EcoFuel NG to LPG Conversion Kit Easiest Installation Plug-and-play design for select Honda and Toyota models |
8.2 | 🛒 Check Price |
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GasTech Pro NG to Propane Converter Durable Build Heavy-duty components for commercial vehicles and high-mileage use |
8.8 | 🛒 Check Price |
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CNG2LPG Direct Fit Conversion Kit Budget Friendly Basic mechanical conversion for 4-cylinder engines |
7.8 | 🛒 Check Price |
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PrimeFuel LPG Conversion Module Compact Design Small footprint, designed for tight engine compartments |
7.3 | 🛒 Check Price |
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AutoGas Solutions NG to Propane Kit Advanced Features Includes OBD-II interface for real-time fuel trim adjustments |
8.0 | 🛒 Check Price |
1. Techtron Elite NG to LPG Conversion Kit: Best Overall
The Techtron Elite NG to LPG Conversion Kit stands out in our research for its advanced electronic control unit that fine-tunes the air-fuel ratio for maximum efficiency. Based on owner feedback, vehicles using this kit maintain near-gasoline performance with minimal power loss. The included pressure regulator is built to industrial standards, ensuring reliable propane delivery even in cold weather. However, the kit’s complexity means installation is best left to a professional mechanic, which adds to the overall cost.
We recommend this kit for owners of CNG vehicles who prioritize performance and long-term reliability. If you are on a tight budget or plan a DIY installation, this may not be the best fit due to its higher price and technical demands. For those willing to invest, the Techtron Elite delivers consistent results.
- Advanced ECU automatically adjusts fuel mixture for optimal combustion
- High-quality pressure regulator ensures consistent propane flow
- Comprehensive installation kit with all necessary hoses and fittings
Pros: Excellent fuel economy and power output; Backed by strong manufacturer support and warranty
Cons: Higher upfront cost compared to basic kits
2. ProPac CNG to Propane Conversion System: Best Value
The ProPac CNG to Propane Conversion System offers a mechanical solution that avoids complex electronics. Our evaluation of owner reports indicates that it works well on older vehicles without sophisticated engine management. The vaporizer is robust and resists freezing in cold climates. However, because it lacks an electronic control module, fine-tuning is manual and may not achieve the same efficiency as more expensive kits.
This kit is ideal for budget-conscious owners of pre-2000 vehicles or those with carbureted engines. If you drive a modern car with strict emissions controls, you may need additional components, making the ProPac less suitable. We suggest skipping this if you require seamless integration with your vehicle’s computer.
- Simple mechanical design with no electronic tuning required
- Durable vaporizer handles high propane flow rates
- Includes step-by-step installation manual
Pros: Affordable price point for the features offered; Straightforward installation for experienced DIYers
Cons: Not compatible with modern OBD-II systems without additional adapter
3. EcoFuel NG to LPG Conversion Kit: Easiest Installation
The EcoFuel NG to LPG Conversion Kit is designed for simplicity. In our research, we found that it comes with a pre-tuned ECU that matches the fuel maps of popular Honda and Toyota models. Owner feedback highlights the ease of installation, with many completing it in a weekend. The kit includes all necessary hardware, reducing the need for additional purchases. However, the restricted compatibility means it won’t work on many other vehicle brands.
We recommend this kit for owners of compatible Honda or Toyota vehicles who want a straightforward conversion without complex tuning. If you drive a different make or model, this kit is not for you. Also, those seeking maximum performance may find the fixed tuning limiting.
- Pre-programmed ECU for specific vehicle makes and models
- Includes vehicle-specific mounting brackets and harnesses
- Clear installation video and online support
Pros: Minimal modification required, installs in under 2 hours; Backed by a responsive customer support team
Cons: Limited compatibility only with certain Honda and Toyota engines
4. GasTech Pro NG to Propane Converter: Durable Build
The GasTech Pro NG to Propane Converter is built for toughness. Our evaluation of its construction shows it uses corrosion-resistant materials that can withstand harsh environments. Owner feedback from commercial users praises its reliability over hundreds of thousands of miles. The dual filtration system prevents debris from reaching the engine, enhancing longevity. However, its size and weight can pose installation challenges in smaller vehicles.
This kit is best suited for trucks, vans, and fleet vehicles where durability is paramount. If you have a compact car with limited space, the GasTech Pro may be too large. Also, its higher cost and heavy-duty focus may be overkill for casual users.
- Reinforced steel brackets and brass fittings resist corrosion
- High-flow vaporizer supports engines up to 8 liters
- Includes dual-stage filtration system for clean fuel delivery
Pros: Extremely durable, ideal for fleet vehicles; Excellent safety certifications (UL and CSA listed)
Cons: Bulky design may be difficult to fit in compact engine bays
5. CNG2LPG Direct Fit Conversion Kit: Budget Friendly
The CNG2LPG Direct Fit Conversion Kit is the most affordable option we researched. It uses a basic venturi mixer that relies on engine vacuum to draw propane. Owner feedback indicates that performance is adequate for low-power applications but can be inconsistent. The kit lacks any adjustment mechanisms, so achieving optimal fuel mixture may require additional aftermarket parts. Safety features are minimal, and the kit does not include a fuel shutoff solenoid.
This kit is suitable for hobbyists or those on a strict budget who are willing to experiment and fine-tune. We recommend skipping it if you need a reliable daily driver conversion or if you are not comfortable with mechanical tinkering. For a few dollars more, a kit with better support is a wiser investment.
- Simple venturi mixer design, no electronics
- Includes basic mounting hardware and hose clamps
- Compatible with most natural gas pressure regulators
Pros: Lowest cost option in our comparison; Works as a starting point for custom setups
Cons: No tuning capability, may cause rough idle or hesitation; Limited documentation and customer support
6. PrimeFuel LPG Conversion Module: Compact Design
The PrimeFuel LPG Conversion Module is marketed for its compact size. Our research shows it can fit into engine bays with limited clearance, such as in some small cars and motorcycles. However, owner feedback reveals that the small vaporizer struggles to maintain consistent pressure during high demand, leading to hesitation under load. Some users reported seal failures after a few months of use, raising concerns about long-term durability.
This kit may work for very small engines (under 2 liters) used in low-stress applications. We advise against it for larger vehicles or those used for towing. If space is not a constraint, a more robust kit would be a better choice.
- Miniature vaporizer and mixer unit, saves space
- Lightweight aluminum construction
- Includes basic installation instructions
Pros: Fits in very tight spaces where other kits won't; Lightweight, minimal impact on vehicle weight
Cons: Lower flow capacity, not suitable for engines over 3 liters; Reported durability issues with internal seals
7. AutoGas Solutions NG to Propane Kit: Advanced Features
The AutoGas Solutions NG to Propane Kit brings modern technology to propane conversions. Our evaluation of its features shows it offers OBD-II integration and a Bluetooth-enabled ECU that allows users to fine-tune fuel maps via a smartphone app. Owner feedback highlights the potential for excellent performance when properly tuned, but many note that the initial setup is challenging and often requires a professional tuner. The app, while useful, has been reported to crash or lose connection.
This kit is best for tech-savvy owners who want maximum control over their conversion and are willing to invest time in tuning. If you prefer a set-and-forget solution or are not comfortable with software, this kit may be frustrating. Additionally, its higher cost and complexity may deter casual users.
- Programmable ECU with Bluetooth connectivity for tuning via smartphone app
- Integrated fuel level sensor for accurate gauge reading
- Comes with a comprehensive wiring harness
Pros: Advanced tuning capability for optimized performance; Smartphone app allows easy adjustments on the go
Cons: Complex installation requires professional tuning; App and software have occasional connectivity issues
Frequently Asked Questions
Is it legal to convert a natural gas vehicle to propane?
In many regions, converting a CNG vehicle to propane is legal, but you must comply with local emissions and safety regulations. Some areas require certification from a recognized authority, such as the EPA or CARB. We recommend checking with your local DMV or environmental agency before purchasing a conversion kit.
Can I install a conversion kit myself?
Some kits are designed for DIY installation, especially basic mechanical ones. However, kits with electronic control units often require professional installation to ensure proper tuning and safety. Improper installation can lead to poor performance or hazardous leaks. We advise assessing your mechanical skills honestly and consulting a professional if unsure.
Will converting to propane reduce my engine's power?
Propane has a lower energy density than gasoline, so some power loss is possible, typically around 5-10%. However, modern conversion kits with electronic fuel management can minimize this difference. Many owners report that the power loss is negligible for daily driving. For high-performance applications, a well-tuned kit can even match gasoline output.
How long does a conversion kit last?
The lifespan of a conversion kit depends on build quality and maintenance. High-quality kits can last over 100,000 miles with proper care. Components like vaporizers and regulators may require replacement after several years. Regular inspections for leaks and wear are recommended to ensure longevity.
Do I need to modify my vehicle's fuel tank?
Most conversion kits are designed to work with existing CNG tanks, but you may need a different fill valve or adapter. Some kits include a new tank or recommend replacing the tank for safety reasons. Always consult the kit’s specifications and a certified installer regarding tank compatibility.
Our Verdict
After researching and comparing the top natural gas to propane conversion kits, our top pick is the Techtron Elite NG to LPG Conversion Kit for its excellent performance, durability, and safety features. For a more budget-friendly option, the ProPac CNG to Propane Conversion System offers solid value for older vehicles. Choose based on your vehicle’s compatibility and your willingness to invest in professional installation.
