Best Dual Fuel Conversion Kit For Generator: Compare 10 Kits

#1 · Best Overall

1. Hutch Mountain EU2200i Kit

Best for: Honda EU2200i owners.

Why it ranks #1: Specifically fits the Honda EU2200i, supports gasoline and propane, and includes fuel adapters; its listed output is 2,200 watts.

Propane-and-gasoline operation is the key draw of the Hutch Mountain kit, giving Honda EU2200i owners another fuel option for backup power, camping, or RV use. Its specified 120-volt output and portable-use focus make it relevant to people who want to adapt a familiar generator for more than one setting.

The kit is specifically listed for Honda EU2200i portable generators, so its appeal is clearest for owners of that model rather than shoppers seeking a universal carburetor. Switching between gasoline and propane adds fuel flexibility for residential backup and camping, while the included manual and fuel adapters provide the listed components for the conversion. Hutch Mountain also identifies the kit for RV use and home power access; the supplied details do not specify an installation method or natural-gas capability.

Skip it if you need a kit explicitly listed for natural gas; HIPA GX340/GX390 offers gasoline, LPG, and CNG operation.

Honda EU2200i owners seeking propane alongside gasoline for camping, RV use, or residential backup are the natural audience. Keep the model-specific fit in mind, and note that the listed fuel choices are gasoline and propane.

Listed on Amazon as: Hutch Mountain Generator Propane Conversion Kit for Honda EU2200i

#2 · Best Honda Tri-Fuel

2. Grenergy EU3000is Kit

Best for: Honda EU3000is tri-fuel owners.

Why it ranks #2: Designed for Honda EU3000is models, it supports propane, natural gas and gasoline and includes a regulator and quick-connect fuel adapter assembly.

A replacement lower panel with quick-disconnect access lets the Grenergy kit add propane and natural gas to a Honda EU3000is without drilling or permanent modifications. The listing also says it retains factory-rated power on propane, a useful distinction for owners who want alternate fuels without sacrificing the stated output.

Grenergy lists compatibility with Honda EU3000is and Co-Minder EU3000is models, while explicitly excluding the Honda Handi. Its bolt-on lower panel provides quick-disconnect access without drilling, and the package includes the regulator assembly and fuel-adapter assembly with quick connect. The listing describes gasoline, propane, and natural-gas operation, plus factory-rated power on propane. With hoses and fittings described as included, buyers can plan around the complete listed connection set rather than separate add-on kits.

Skip it if you own a Westinghouse WGEN9500DF; the GENERIC WGEN9500DF kit uses its existing carburetor port for natural gas.

Honda EU3000is and Co-Minder EU3000is owners seeking tri-fuel operation without drilling are the intended buyers. The complete connection components and propane power claim are compelling, but this kit is explicitly not for the Honda Handi.

Listed on Amazon as: EU3000is Propane, Natural Gas & Gasoline Tri Fuel Conversion Kit for Honda Generator Inverter LPG CNG

#3 · Broadest Engine Fit

3. Hipa GX390 Carburetor Kit

Best for: GX390 tri-fuel conversions.

Why it ranks #3: Supports gasoline, LPG and CNG, with stated compatibility for Honda GX340/GX390 and several Champion engine sizes and clones.

Three-fuel operation sets the HIPA carburetor apart for compatible generator owners: it supports gasoline, propane, and natural gas. Its 3-position rotary switch includes an OFF setting, while a manual choke lever is provided for cold starts, giving buyers two practical controls to consider alongside engine compatibility.

HIPA lists Honda GX340 and GX390 engines and clones among its compatible applications, with additional Champion generator models and engine sizes named in the product details. Check those specific fitments against your generator before choosing it. The rotary switch provides a stated OFF position to prevent gas leaks, and the manual choke lever supports cold starting. With gasoline, LPG, and CNG listed, this is a fit for buyers who want several fuel choices rather than propane conversion alone.

Skip it if you own a Honda EU2200i; Hutch Mountain's EU2200i kit is listed specifically for that portable generator.

Choose this for a compatible GX340 or GX390-based generator when gasoline, propane, and natural gas flexibility matters. Verify the engine and generator application against HIPA's listed fitments; the product is not presented as a universal conversion.

Listed on Amazon as: HIPA 389cc 420cc Tri Dual Generator Carburetor Propane Conversion kit for Champion Predator Generac Honda OHV Engine 338cc 389cc 420cc 460cc GX340 GX390 GX420 GX460 Portable Generator

#4 · Best Pressure Details

4. NIMTEK GX390 Kit

Best for: GX390 manual-choke conversions.

Why it ranks #4: Targets 389cc and 390cc generators, lists 5,000-watt rated and 5,500-watt maximum output, and specifies LPG and natural-gas pressure ranges.

A stated 5,000-watt rated and 5,500-watt maximum output application gives the NIMTEK kit a clear GX390-generator focus. It is listed for 389cc and 390cc sets and includes LPG and natural-gas pressure ranges, useful details for buyers checking whether their engine and fuel supply match.

NIMTEK identifies this as a dual-fuel carburetor replacement for GX390 4.5 kW generators, with LPG and natural-gas conversion also described. Its stated 1–6 kW generating-set range helps frame the intended generator scale, while the 5,000-watt rated and 5,500-watt maximum figures provide further application context. LPG pressure is listed at 2.8–3.8 kPa and natural gas at 2.0–2.6 kPa; those requirements make supply-pressure checks part of planning the conversion.

Skip it if you need a carburetor listed for smaller GX200 engines; SYOWADA's GX200 kit names 208cc to 212cc generators.

This is a focused option for owners of compatible 389cc or 390cc generators seeking LPG or natural-gas operation. Match the generator application and gas supply to NIMTEK's stated ranges before selecting the manual-choke conversion.

Listed on Amazon as: NIMTEK Dual Fuel Carburetor LPG Conversion Kit for Generator 4.5-5.5KW GX390 188F Carburetor

#5

5. Carburionix GX390 Kit

Best for: GX390 pressure-specification shoppers.

Why it ranks #5: Lists GX340, GX390 and GX420 fitment, LPG and CNG conversion, and a 5–8 kW output range, though compatibility details are less model-specific.

Separate LPG and CNG pressure ranges make the Carburionix GX390 conversion kit a specification-focused option for compatible portable generators. It is listed for GX340, GX390, and GX420 engines, with a stated 4.5–6.5 kW gasoline-generator application range, helping buyers compare engine and fuel-supply requirements.

The product identifies a GX390 188F portable gasoline generator and also lists GX340 and GX420 engines, so engine-family compatibility is central to fit. Its LPG pressure range is 2.8–3.8 kPa and its CNG range is 2.0–2.6 kPa; the pressure-regulating valve has a stated output range of 0.03–1.56 kPa. These figures help buyers assess their gas supply and regulator setup before conversion. The listing describes LPG and CNG conversion alongside gasoline operation.

Skip it if you have a Honda EU3000is; Grenergy's EU3000is kit is listed for that Honda inverter generator and includes a quick connect.

GX-series generator owners who can match the engine and gas supply to the listed specifications are the clearest fit. This kit offers LPG and CNG conversion, but its stated application centers on GX340, GX390, and GX420 engines.

Listed on Amazon as: New GX390 188F Dual Fuel Generator Carburetor LPG NG Petrol Conversion Kit

#6

6. KELKONG GX390 Kit

Best for: GX-series LPG and NG conversions.

Why it ranks #6: Covers GX270/GX340/GX390-family engines and named Generac and Westinghouse models; included carburetor, gasket and damper handle are specified.

Broadly listed GX-engine and generator applications define the KELKONG carburetor kit, which supports LPG and natural-gas conversion for gasoline generators. Its fitment list spans GX270, GX340, and GX390 engines as well as named Generac and Westinghouse models, making model matching the key first step for buyers.

KELKONG lists engine displacements from 301cc through 459cc and names several 182F–192F engine types, alongside generators including Generac GP5000, GP5500, and GP6500 and Westinghouse WGEN5500. That breadth can help owners of the named applications identify a potential replacement, but the long list makes exact engine and generator matching essential. The included carburetor, damper handle, screw, and gasket provide the stated conversion components; LPG and natural gas are the listed alternate fuels.

Skip it if you need published gas-pressure ranges; NIMTEK's GX390 kit specifies LPG and natural-gas pressure ranges.

Owners of a listed GX-series engine or named Generac or Westinghouse generator are the intended audience for this LPG and natural-gas carburetor kit. Check the exact application before ordering; the supplied details do not give pressure specifications.

Listed on Amazon as: GX340 GX390 Carburetor LPG/NG Dual fuel Conversion Kit 188F

#7 · Best Small-Engine Fit

7. SYOWADA GX200 Kit

Best for: GX200 small-generator conversions.

Why it ranks #7: Specifically targets Honda GX200/170F and 208–212cc generators, with gasoline, LPG and natural-gas conversion and 2–2.8 kW rated output.

GX200 and 170F compatibility puts this SYOWADA carburetor kit in the small-generator category, with listed applications from 208cc to 212cc. It supports gasoline, LPG, and natural-gas conversion, while a stated 2.8–3.8 kPa LPG pressure range gives buyers one concrete supply requirement to check.

SYOWADA lists the kit for Honda GX200 170F portable gasoline generators and 208cc to 212cc applications, with a rated output range of 2–2.8 kW and a 3,500-watt maximum. That combination helps buyers assess whether their generator's engine and output class match the intended use. The kit supports gasoline-to-LPG and gasoline-to-natural-gas conversion, and the specified LPG pressure range is 2.8–3.8 kPa. The supplied information also calls for adequate ventilation during gas operation.

Skip it if you need conversion for a 389cc or 390cc set; NIMTEK's GX390 carburetor is listed for those engine sizes.

Owners of compatible GX200 or 170F generators in the listed 208cc–212cc class are the best match. Its fuel flexibility is useful, but check LPG supply pressure and provide adequate ventilation during gas operation.

Listed on Amazon as: SYOWADA 170F GX200 Dual Fuel Carburetor Generator LPG CNG Conversion Carburetor Kit, Replacemant for Honda GX200 170F 170G-GX200 (Style2)

#8

8. Cirecsiy Predator Kit

Best for: Predator 3200/4000W owners.

Why it ranks #8: Designed for Predator 3200W/4000W generators and supports gasoline, propane and natural gas; the package lists a regulator, hose and fittings.

Compatibility with Predator 3200W and 4000W portable generators is the defining point of the Cirecsiy conversion kit, which adds propane and natural-gas choices to gasoline operation. Its listed carburetor adapter, regulator, hose, clamps, and fittings provide the core connection components for the conversion.

This kit is specifically presented for Predator 3200W or 4000W generators, so owners of other generator models should not treat the listing as universal. It enables gasoline, propane, or natural-gas operation, giving compatible owners multiple fuel choices for home backup or outdoor use. The included carburetor adapter, fuel regulator, fuel hose, clamps, and required fittings make up the stated conversion hardware. Those components help buyers understand what the kit supplies, though the supplied details do not state fuel-pressure ranges.

Skip it if you need a kit with published LPG and natural-gas pressure limits; Carburionix's GX390 kit provides separate ranges.

Predator 3200W and 4000W owners seeking gasoline, propane, and natural-gas flexibility are the target buyers. The listed hardware covers key conversion components, but check your setup needs because fuel-pressure specifications are not supplied.

Listed on Amazon as: Propane Conversion Kit for Predator 3200/4000W Generator – Tri‐Fuel LPG/NG Carburetor Adapter for Gasoline Portable Generator

#9

9. Anxingo Tri-Fuel Carburetor

Best for: Multi-model replacement carburetor buyers.

Why it ranks #9: Lists fitment for several Generac, Ai Power, Champion and Firman generators, but its model description and duplicated fitment text leave the precise engine fit unclear.

A replacement carburetor listed across several generator applications is the Anxingo kit's main practical distinction, with named fitments including Generac GP1800 and GP3250, Ai Power AP4000, and Champion 3000 and 4000. Its included fuel lines and clamps add the connection pieces to the supplied carburetor and gaskets.

The kit includes one three-fuel or dual-fuel manual carburetor, three gaskets, a fuel line, and two fuel-line clamps. That component set gives a buyer the listed carburetor and connection hardware together, rather than a carburetor alone. The product names multiple generator models, including Generac, Ai Power, Champion, and Firman applications, so matching the exact generator remains important. The supplied facts also say LPG and natural-gas pressure should remain within the specified range during use.

Skip it if you need a kit with a published engine pressure range; NIMTEK lists specific LPG and natural-gas pressure ranges for its GX390 carburetor.

This Anxingo kit suits buyers replacing a carburetor on one of its named generator applications and wanting the listed fuel-line hardware included. Check the precise model fit and keep gas pressure within the stated range.

Listed on Amazon as: Anxingo 163cc 196cc 212cc 224cc Tri Dual Generator Carburetor Kit

#10

10. NashFuel WGEN9500DF Kit

Best for: WGEN9500DF natural-gas users.

Why it ranks #10: Adds natural gas to the Westinghouse WGEN9500DF, which is already described as dual fuel; it is a narrower supplemental conversion rather than a core dual-fuel kit.

A natural-gas inlet that uses the Westinghouse WGEN9500DF carburetor's existing port is the defining feature here, letting owners add natural-gas operation without permanent modification. The kit also preserves the generator's gasoline capability, and returning to propane requires reconnecting the stock propane hose.

This kit is specifically identified for the Westinghouse WGEN9500DF, so that named generator is central to the buying decision. Using the existing carburetor port avoids permanent modification, while retaining gasoline operation gives owners a way to keep the original fuel option available. The listed inlet-pressure requirement is 9–13.8 inches of water column, and the product calls for an Impco or aftermarket regulator. Those requirements matter when planning the gas supply and setup.

Skip it if you want a conversion listed for a different generator; Grenergy's EU3000is kit is specifically for Honda EU3000is models.

Westinghouse WGEN9500DF owners seeking a reversible natural-gas addition should focus on this kit. Its existing-port approach preserves gasoline use, but the installation plan must account for the stated inlet-pressure range and regulator requirement.

Listed on Amazon as: Natural Gas Conversion Kit fits Westinghouse WGEN9500DF Generator