Frequently Asked Questions

Our experience has enabled us to find the answers to just about every question our customers may have

  • How will converting my car to LPG save me money?

    Autogas is half the price of diesel or petrol. This is because the tax is far lower in recognition of its environmental benefits. There are also benefits such as a small reduction in Vehicle Excise Duty (VED) and reduced engine wear.

  • Why is LPG better for the environment?

    Two reasons. Firstly the simple chemical nature of the fuel ensures that it burns cleaner producing less pollution. LPG has the potential to make a huge difference to local air quality, particularly in urban areas, see table.   It is produced as a by-product of oil extraction and refining operations.  LPG is by far the most valuable use for it.

  • Is LPG safe?

    Crash and fire tests have proved that the strength and integrity of tanks fitted to LPGA safety guidelines (CoP11) make the LPG fuel system safer than petrol. There are now over eight million LPG vehicles around the world. The Queen has four of them.

  • What is LPG?

    Liquefied Petroleum Gas, often called autogas when used to as a vehicle fuel, is made up of propane and butane. It is a by-product of oil extraction and refining operations, particularly when using North Sea 'wet' crude. Consequently, the UK has an abundant supply. Currently the UK exports LPG and imports petrol.

  • Does it matter what system I put on my car?

    Yes it does - very much. It is crucial to have both the right system for your car and to have it fitted by a mechanic trained both to LPGA standards.

  • Will I get a warranty?

    All our systems are provided with a full parts warranty for 2 years.

  • How will it affect my car's performance?

    Modern LPG conversions suffer no noticeable loss of performance. Engines will run smoother and be slightly quieter.


  • How does an LPG conversion work?

    The conversion adds a second independent fuel system, making the car bi-fuel or capable of running on either petrol or LPG. This requires a second tank, usually installed in the spare wheel well.

  • What happens if I run out of LPG?

    All conversions are dual fuel so when the car runs out of LPG it will automatically switch to petrol. This is quite normal, hardly noticeable and causes no damage to your engine. The car will normally cold start on petrol and then quickly switch over when the engine is warm. It is therefore important to have a little bit of petrol.

  • Can I still drive on petrol?

    The conversion adds a second fuel system, leaving the original petrol system in place. Therefore the car drives as before on petrol and will normally cold start on petrol. However, when you start filling up with LPG you will be loathe to buy more petrol than you absolutely have to.

  • What happens if I get a puncture?

    Most conversions put the LPG tank in the spare wheel well of the car so as not to reduce boot space. If you are unlucky enough to get a puncture you can use one of these tyre weld systems. This reinflates the tyre and seals the puncture until you can get it properly repaired.


    Tyre Weld

    • Seals and inflates punctured tyres instantly
    • Eliminates the need for immediate tyre change
    • Approved by National Tyre Distributors Association

    BMW claim that punctures occur only every 93,000 miles, this being the justification for the absence of a spare wheel on their M Roadster.

    Tyre Weld
  • Where can I refuel?

    The industry has invested over £100 million in the infrastructure and there are now over 1,200 LPG refuelling stations in the UK. If you do run out then the car will automatically switch over to petrol.

  • Can I convert my diesel to use LPG?

    Although some companies are developing systems that use LPG and diesel at the same time, the AUTOTECH position is that they are very different fuels. Introducing them together may cause great increases in power output and consequently mechanical problems. If, in the future, a company can demonstrate a system that is both mechanically reliable and reduces emissions, then AUTOTECH will advocate its use.

  • How much does it cost?

    This depends on the vehicle to be converted. Use our instant quotation service to find out the cost of converting your car.

  • Will it damage my engine?

    On the contrary, the LPG conversion will reduce engine wear. LPG burns cleaner than petrol. This means less emissions out of the exhaust and less carbon deposits in the engine. These deposits are very abrasive and can contribute to engine breakdowns. The oil and spark plugs will also last longer. Some engines use softer valve seats / valves and therefore it is advisable to fit  valve protection,  Flash Lube or similar system. This will help to prolong the life of these softer items. We cannot be held responsible for the manufacturers claims on these products. We can advise on upgrading the valve and valve seats if required.

  • Can you Convert my car in one day?

    To convert your car correctly it takes a number of days. On all cars we need to remove the inlet manifold to allow us to machine it to take the gas injectors. On a supercharged engine, it requires the removal of the supercharger before we can start on the manifold. This part of the job takes almost a day to complete, The only way to do this job more quickly is to drill the manifold in-situ and this would lead to the metal swarf from the drill bit entering the inlet manifold, and consequently going into your engine. We also need to manufacture and paint brackets and various parts for the conversion, rather than hold items with wire ties.

  • What about servicing?

    The LPG system should be inspected annually by a specialist LPG technician. This normally takes about an hour or so and is consequently not expensive.

  • Will it affect my insurance?

    You will have to notify your insurance company. The major companies will not increase your premium provided that the work has been properly carried out.

    Insurance of Gas Powered Vehicles

    A conversion of a vehicle to run on LPG is a modification and as such must be advised to your insurance company. In a survey undertaken in November 2002 the following companies advised that they will not charge an additional premium if the conversion is by an LPGA Approved Installer:

    If a conversion is not undertaken by an LPGA Approved Installer then 20 of the companies would not insure the vehicle AT ALL.


  • Will the conversion improve the resale value of my car?

    This depends entirely on the quality of the system fitted. A good quality, reliable system is akin to having a half price fuel button on the dashboard and will be a good selling point. Unreliable equipment without proper certification will lower the value of the car.

  • What is going to happen to LPG prices?

    The Government has committed itself to reducing pollution. The environmental credentials of LPG are proven. Therefore it is extremely unlikely that the duty differential between LPG and petrol and diesel will be reduced.

  • Can an LPG system be removed?

    The system can be taken out and put on another car but there are some important issues to consider.

    Removing and Transferring LPG Systems

    Your AUTOTECH LPG system can be removed from your vehicle should you wish. This is a much simpler exercise than the installation however it must be carried out by a properly qualified technician so that all systems are properly isolated and the vehicle returned to its original specification. It involves the following:

    • Removal of the LPG filling point, fuel tank, injectors, vaporiser fuel switch and gauge
    • Isolation and/or removal of the LPG wiring loom, connections and ECU
    • Making good to the dashboard, bodywork and inlet manifold.

    Systems can be transferred from one vehicle to another, however, it is not a simple matter, some systems will be totally compatible while others will require new wiring looms and reprogramming of the ECU by the equipment manufacturer. If you are thinking about transferring your system you should obtain advice on compatibility from AUTOTECH.


  • Does anyone famous use LPG?

    The Queen has two Rolls-Royces, a Daimler and a Rover running on autogas, and a refuelling facility in the Royal Mews. The Duke of Edinburgh's Metrocab runs on LPG. The Prime Minister, the Deputy Prime Minister and the President of the USA all use LPG cars.

    One of The Queen's Rolls Royces
  • Will LPG take off?

    Recently Brian Wilson, the Energy Minister, unveiled the 100,000th LPG car in the UK, which represents an investment of over £150 million. The Oil industries have invested over £100 million in the fuelling infrastructure. Globally there are now more than eight million vehicles powered by LPG.

  • Why does AUTOTECH promote LPG?

    LPG offers one of the best routes to cleaner transport and better air quality since it is practical, proven and will save the user money.


  • Will I be exempt from Congestion Charging?

    Contrary to what is sometimes said, not all LPG conversions qualify for CC exemption. To qualify the car has to meet Band 4 (40% improvement on Euro IV) emissions targets.


  • How long does the conversion take?

    We generally say four to five days to allow time for system testing.