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LPG conversions

Go green with our guide to LPG vehicle conversion

Once you have decided that an LPG converted vehicle is for right for you, you will need to find a suitable LPG system for your vehicle and an LPGA Approved Installer to fit it to your vehicle.

Choosing a suitable LPG system and installer

Most petrol powered cars and light commercials can be converted to run on LPG. If you already have a petrol powered vehicle chances are you could convert you vehicle immediately and start to enjoy the financial and environmental benefits of LPG. There are many systems available from many manufacturers, however not all systems are suitable for every vehicle.

LPGA Approved Installer symbolIt is recommended that conversions are carried out by an LPGA Approved Installer. These companies comply with set standards, training and examination of installers, and a thorough inspection process that has government approval. These approved installers will be able to advise on the best system for your particular vehicle and needs.

The process of converting an existing petrol powered vehicle to run on LPG is relatively simple , and takes approximately two days to complete.

The average cost of converting a 4 cylinder vehicle to run on LPG should be around £1800 (prices may vary depending on vehicle type, age, condition and specification of conversion kit and is intended as a guide only). The average motorist covering 20,000 miles per annum should be able to recover this initial investment in around two years.

Insurance

Converting a vehicle to run on LPG is classed as an engine modification and as such you will need to notify your insurer. Most insurance companies will insure an LPG converted vehicle provided you can produce an LPGA Approved Installer conversion certificate or Safety Check certificate for your vehicle. You should check the individual requirements of your insurance company before having a vehicle converted and this can usually be done with a simple phone call.

DVLA

You should also notify DVLA that your vehicle has been converted to run on LPG as it is a mechanical change from when the vehicle was first registered. By registering the vehicle with DVLA as alternatively fuelled you may be entitled to a reduction in Vehicle Excise Duty (road tax).

The LPG system explained

Modern LPG systems mirror those of conventional fuel systems. An LPG system consists of a storage tank, fuel lines, fuel pump, injectors and ECU (electronic control unit).

Tanks

LPG tank mounted in spare wheelAs LPG is stored as a liquid under pressure, tanks are designed to withstand high impact and extreme temperatures. To allow for product expansion LPG tanks should be filled to 85% and fitted with an over fill protection valve. Tanks should be permanently mounted in the vehicle typically in the boot, spare wheel well or under the chassis.

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Filler Point

Filler pointThe vehicle filler point should be permanently mounted to the vehicles body in a convenient spot typically close to the petrol filling cap. In the case of 4x4 vehicles the filling connector may be mounted on the tow bar attachment or low down on the vehicle bumper.

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Fuel switch & gauge

Most LPG vehicles are dual fuel, meaning they will run on both LPG and petrol and most LPG vehicle will switch seamlessly between the two fuels whilst in motion at the flick of a switch or when they run out of LPG. This switch is usually mounted conveniently on the dash and may also be integrated with the LPG fuel gauge.

Engine components

Looking under the bonnet you may notice the subtle additions of the LPG fuel system. These will typically include (depending on the vehicle and system) the LPG injectors, vaporiser, and ECU.