Understanding the LPG Conversion Process: What to Expect

Thinking about converting your car to LPG but unsure what the process involves? Understanding what to expect will help you make an informed decision and prepare properly.

Step 1: Initial assessment:

Your chosen specialist will examine your vehicle to confirm suitability. They'll check the engine condition, fuel system, electronic components, and available space for the LPG system. This assessment is usually free and takes about 30 minutes. They'll also discuss your driving habits and fuel consumption to estimate potential savings.

Step 2: System selection:

Not all LPG systems are identical. Your specialist will recommend either a sequential system (which injects LPG at precise moments like petrol injection) or a venturi system (simpler but less efficient). Sequential systems are more common in modern vehicles and offer better performance and emissions.

Step 3: Tank installation:

The LPG tank is typically installed in the spare wheel well or under the car, depending on your vehicle type. Some conversions use in-boot tanks for vehicles with limited underbody space. The tank must be securely mounted and regularly tested for safety. This is a critical component, so installation quality is paramount.

Step 4: System plumbing and wiring:

Gas lines are run from the tank to the engine bay, where a regulator reduces pressure and a vaporizer heats the gas. Injectors are fitted to the intake manifold, and electronic sensors are integrated with your engine management system. Wiring connects all components and allows the car to switch between petrol and LPG seamlessly.

Step 5: Tuning and testing:

Once installed, the system requires professional tuning. Specialists use diagnostic equipment to optimize the fuel mixture and ensure smooth switching between fuels. Your car will run through various tests to confirm proper operation, emissions compliance, and reliability.

Step 6: Safety certification:

Professional conversions include safety certification. Your vehicle will be tested to ensure the LPG system meets all legal requirements. You'll receive documentation proving the conversion is safe and compliant.

Typical timeline and costs:

• Assessment: 30 minutes to 1 hour
• Conversion work: 2-4 days depending on complexity
• Total cost: £1,500-£3,000 including parts and labour
• Warranty: typically 2-5 years on parts and labour

After conversion, your vehicle will have a fuel selector switch allowing you to choose between petrol and LPG. Most modern conversions switch automatically when LPG runs out. You'll need to locate your nearest LPG filling station and familiarize yourself with the filling process, which is straightforward and similar to petrol refuelling.