15/05/2026
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You can convert a petrol generator to run on LPG/propane with a conversion kit. It’s a common mod, but you need to do it right for safety and performance.
*How it works*
Petrol generators use a carburetor to mix liquid fuel and air. LPG is already a gas, so you replace/add a system that meters LPG gas and mixes it with air before it enters the engine.
*Basic steps*
1. *Get a conversion kit*
Buy a kit made for your generator’s engine size. Kits usually include:
- LPG regulator/regulator valve
- Gas mixer or adapter that bolts onto the carburetor
- Hoses, fittings, and a demand regulator
- Instructions for your engine model
Brands like Century Fuel Products, US Carburetion, and Motenergy make them. Match it to 2-15kW, single cylinder, etc.
2. *Install the mixer/adapter*
- Turn off fuel and disconnect the spark plug for safety.
- The mixer sits between the air filter and the carburetor, or replaces the carburetor’s fuel bowl. It lets LPG gas mix with intake air.
- Some kits keep the original carburetor so you can switch between petrol and LPG. Others replace it.
3. *Mount the regulator*
The LPG tank outputs high pressure. The regulator drops it to low pressure the engine can use. Mount it securely, away from heat and moving parts.
4. *Connect hoses and check for leaks*
Use LPG-rated hose and brass fittings only. After connecting, use soapy water on all joints with the gas on - bubbles = leak. Fix before starting.
5. *Adjust and test*
Start the generator on LPG. You’ll likely need to adjust the load block or idle screw on the regulator for smooth running. It should run without surging or stalling under load.
*Important things to know*
- *Power loss*: LPG has ∼10-15% less energy than petrol, so expect slightly lower max output.
- *Oil changes*: LPG burns cleaner, so oil stays cleaner longer, but follow the manual.
- *Dual fuel*: Most kits let you switch back to petrol. Don’t run both at once.
- *Safety*: Never run the generator indoors. LPG is heavier than air and pools on the ground. Store tanks upright, outdoors, away from heat.
- *Legality*: In some places you need certification for gas conversions. Check local rules.
