11/05/2026
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Converting a petrol generator to LPG means fitting a dual-fuel kit so it can run on liquefied petroleum gas instead of, or alongside, petrol. It’s popular because LPG is often cheaper, burns cleaner, and stores better than petrol.
Here’s the full picture:
1. How the conversion works
You’re not replacing the engine. You add a kit that feeds LPG into the engine’s air intake.
*Core parts:*
1. *LPG regulator* – Drops high pressure from the gas cylinder to low pressure the engine can use.
2. *Gas mixer/venturi* – Fits between the carburetor and air filter. It mixes LPG with air before it enters the cylinder.
3. *Fuel selector valve* – Lets you switch between petrol and LPG. Most kits are dual-fuel, not LPG-only.
4. *LPG-rated hose & clamps* – Heavy-duty hose made for gas. Regular fuel hose will crack and leak.
5. *Load adjuster screw* – Fine-tunes the air-fuel mix so it idles smoothly on gas.
The carburetor stays in place. On startup you run on petrol for 1-2 min to warm the engine, then switch to LPG.
2. What you gain
- *Lower running cost*: In most of Nigeria right now, LPG costs less per kWh than petrol. You’ll see 20-40% savings if you run daily.
- *Cleaner engine*: LPG burns cleaner, so less carbon buildup. Oil stays cleaner, spark plugs last longer, less carburetor cleaning.
- *Better storage*: LPG doesn’t go bad like petrol. No stale fuel issues after 2 weeks.
- *Less odor/smoke*: Exhaust is cleaner and less smelly.
- *Backup option*: Keep petrol as backup if gas finishes.
3. What you lose
- *Power drop*: Expect 5-10% less output on LPG. A 5kVA generator gives ∼4.5kVA on gas.
- *Cold starts*: LPG doesn’t vaporize well when cold, so you start on petrol.
- *Upfront cost*: Kit + labor is ₦18k-₦45k for 2-5kVA sets. Pays back in 1-3 months if you run 4+ hrs/day.
- *Power loss risk if installed badly*: A bad mix setting makes it stall under load.
4. Installation process
1. Mount the regulator on the frame, away from the exhaust.
2. Install the gas mixer between carburetor and air filter. No drilling into the carburetor itself.
3. Connect LPG hose from cylinder to regulator, regulator to mixer.
4. Test every joint with soapy water. No bubbles = no leak.
5. Start on petrol, warm up, switch to LPG, adjust the load screw for smooth idle.
6. Test under load with a bulb, fan, or fridge.
Takes 30-60 min for someone who’s done it before.
5. Safety rules you can’t skip
- Run the generator outside, in open air. LPG is heavier than air and pools if leaked.
- Use only LPG-rated hose and clamps. Test for leaks every time you change a cylinder.
- Keep cylinder upright, away from heat and direct sun.
- Turn off cylinder valve when not in use.
- Don’t install indoors, in a shop, or near drains.
6. What generators can be converted
Most 2kVA to 8kVA single-cylinder 4-stroke generators: Honda, Lutian, Firman, Senci, Tiger, Senwei, Elepaq.
2-stroke generators and inverter generators are usually not suitable.
7. Running cost example
3kVA generator:
- Petrol: ∼1L/hr at ₦980 = ₦980/hr
- LPG: ∼0.9kg/hr at ₦1,200/kg = ₦1,080/hr
Prices change by location. In areas where LPG is ₦1,000/kg or less, you save money per hour.
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*What I need from you to give exact advice:*
1. Generator brand and model
2. kVA size
3. How many hour
