Most four-stroke spark ignition engines can be converted to bi-fuel (LPG and petrol), including fuel-injected, turbo-charged engines. We are aware that systems are being developed to convert diesel engines to run on a mixture of LPG and Diesel (called Duel Fuel or LPG diesel blend) but we have not yet been provided with satisfactory test results for engine durability or emissions. Accordingly we are not able to recommend such conversions at the present time.
An LPG conversion results in a bi-fuel car, ie one that can run on either LPG or petrol. A second independent fuel system is added to the car, for which a dedicated tank is needed. The tank is usually fitted in the spare wheel well, but can sometimes be installed underneath the car. As with petrol and diesel, liquid LPG is bought by the litre and pumped into the tank via a hose and a filling point. It becomes a gas just before entering the combustion cylinder.
Gas tanks are available in a vast array of sizes. Loss of boot space can be kept to a minimum by using a doughnut-shaped tank fitted into the spare wheel well.
You are strongly recommended to use an LPGA-approved installer to do the work to ensure a safe and satisfactory conversion and get the strength of the Association behind you.
It certainly does. The system used depends on the vehicle being converted; an older carburettor vehicle will have a different system to a modern fuel-injected vehicle with a catalytic converter. It is vital that the most suitable, efficient and safe system for your car is fitted by an LPGA-approved installer.
Conversion costs are from about £900, depending on the vehicle being converted and the system being installed. This initial capital outlay can be recouped via lower running costs.
Converting to LPG can increase the power and performance of your car, especially if a turbo model. However generally there is a small loss in performance, but so small you won't notice it while driving. What you will notice, compared with a diesel vehicle, is the smoother and quieter ride.
LPG is renowned for its excellent safety record; it is used in hundreds of household appliances such as cigarette lighters and patio heaters. Research and testing conducted by Dutch research institute TNO concluded that the safety of modern autogas vehicles is in fact better than for petrol vehicles.
You must notify your insurance company if your car has been converted, or your cover could be invalidated. You should have no problems with increased insurance premiums, provided an LPGA-approved installer carried out the conversion.
Your usual garage can continue to carry out routine servicing on your car. An LPG system should receive an inspection at least annually and this should be by an LPGA approved installer.