
Liquefied Petroleum Gas (LPG) is an increasingly popular alternative fuel for vehicles, offering significant cost savings and environmental benefits. However, converting a car to run on LPG involves modifying its engine, which can affect insurance coverage. While some insurers may refuse to cover LPG-converted vehicles, others offer specialist policies for modified cars, including LPG conversions. Failure to notify your insurer of an LPG conversion may invalidate your insurance claim in the event of an accident, so it is crucial to understand how LPG conversion affects your insurance options and to choose a policy that suits your needs.
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What You'll Learn

LPG conversion as a vehicle modification
Liquefied Petroleum Gas (LPG) conversion involves modifying a vehicle's engine to run on LPG, in addition to or instead of its original fuel (usually petrol). This process typically includes the installation of an LPG tank, fuel lines, injectors, and an evaporator, alongside the vehicle's existing fuel system components.
LPG conversion is an attractive option for many drivers due to its cost-saving and environmental benefits. LPG is often cheaper than petrol or diesel, leading to significant savings on fuel costs over time. Additionally, vehicles running on LPG emit fewer harmful pollutants, such as nitrogen oxides (NOx) and particulate matter, contributing to cleaner air.
However, LPG conversion does come with certain challenges and considerations. One notable issue is LPG's difficulty in vaporizing at low temperatures, which can lead to hard starts on cold mornings. Manufacturers often address this problem by installing an auxiliary system that initially uses petrol to start the engine and then switches to LPG once it reaches a suitable operating temperature. The space required for an LPG tank is another significant consideration, especially for smaller cars.
When it comes to insurance, LPG conversion is considered a vehicle modification, and it is essential to notify your insurer of any modifications made to your car. Some insurance companies may view the LPG system as an additional risk factor, leading to higher insurance premiums. However, informing your insurer about the conversion and ensuring the work is certified by a professional can help mitigate excessive premium increases. Additionally, some insurance companies specialize in providing competitive quotes for modified cars, including LPG conversions, so it is worth shopping around to find the best deal.
It is important to note that the availability and cost of LPG car insurance may vary depending on your location and specific circumstances.
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Insurers' view of LPG as a risk factor
LPG conversion involves modifying a vehicle's engine to run on liquefied petroleum gas, which often includes installing an LPG tank, fuel lines, injectors, and an evaporator. While LPG is an attractive option for many drivers due to its cost savings, environmental benefits, and energy security, it does come with certain challenges and considerations. One of these considerations is how LPG conversion may affect a vehicle's insurance.
Insurers may view LPG conversion as an additional risk factor and, in some cases, may refuse to offer cover or provide specialist policies with higher premiums. This is because LPG conversion is considered a vehicle modification, and any changes to the original design can impact the insurance coverage. However, it is important to note that not all insurers take this view, and some companies specialize in offering competitive insurance for modified cars, including LPG conversions.
The key to ensuring your vehicle remains insured after an LPG conversion is to inform your insurer about the modification. While some insurers may not take LPG conversion into account when calculating premiums, others may increase the premium due to the perceived additional risk. However, by shopping around and speaking to knowledgeable enthusiasts, LPG car owners can often find insurance at competitive prices, comparable to those of petrol or diesel-powered vehicles.
Ultimately, the decision to insure an LPG-converted vehicle rests with the individual insurer and their risk appetite. Some insurers may require a specialist policy or increase premiums, while others may not view LPG conversion as a significant risk factor. Therefore, it is essential for vehicle owners to disclose any modifications and discuss the specific requirements and implications with their insurer to ensure adequate coverage.
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LPG conversion and engine performance
LPG, or liquefied petroleum gas, is a type of liquid gas that can be used as fuel for vehicles. It is a by-product of processing natural gas liquids and refining crude oil. LPG-fuelled cars have become more common in recent years, driven by the desire for a more affordable and environmentally friendly alternative to petrol and diesel.
LPG conversion involves modifying a vehicle's engine to run on LPG, in addition to or instead of petrol. This typically includes installing an LPG tank, fuel lines, injectors, and an evaporator. While LPG conversions can offer significant fuel cost savings, there are some potential drawbacks and challenges to consider when it comes to engine performance:
One notable challenge is that LPG has difficulty vaporizing at low temperatures. In cold weather, LPG may remain in a liquid state, leading to hard starts or requiring multiple attempts to start the engine. To address this issue, manufacturers often install an auxiliary system that initially uses petrol to start the engine, then switches to LPG once it reaches a suitable temperature. This means that dual-fuel capability is beneficial for engine performance in colder climates.
Another consideration is the additional wear on the cylinder walls due to the dryness of LPG. An engine designed for petrol assumes that the liquid fuel will act as a lubricant, aiding the engine oil on the piston. The dry LPG fuel can cause increased wear on the cylinder walls over time.
Access to LPG refuelling stations is also a factor that can impact engine performance. LPG refuelling stations are less common than petrol or diesel stations, particularly in rural areas. This limited availability can impact the feasibility of LPG conversion, as it may be challenging to find LPG fuel when needed.
Finally, the cost of LPG conversion, which can be as high as £2,000, is a significant factor to consider. While LPG fuel costs are often lower than petrol or diesel, the upfront conversion cost may outweigh the potential savings for some drivers, especially given the recent increase in LPG prices.
Overall, while LPG conversion can offer benefits such as reduced fuel costs and environmental impact, there are also challenges that can impact engine performance and the feasibility of LPG as a fuel alternative. It is essential to carefully consider these factors before deciding whether to convert to LPG.
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Cost savings and environmental benefits of LPG
Converting a car to LPG (Liquefied Petroleum Gas) can result in cost savings, as LPG is often cheaper than petrol or diesel, leading to reduced fuel costs over time. In addition, LPG tanks are designed to be highly robust and safe, which can help prevent excessive premium increases.
LPG conversions also offer environmental benefits. LPG-powered vehicles emit fewer harmful pollutants, such as nitrogen oxides (NOx) and particulate matter, contributing to cleaner air and improved air quality. LPG produces significantly lower carbon dioxide (CO2) emissions per unit of energy compared to coal, oil, and diesel, helping to reduce carbon footprints and mitigate climate change.
LPG is also versatile, making it an attractive option for various applications beyond transportation, including cooking and heating. Its use can help reduce deforestation and forest degradation, especially in regions where wood and biomass are traditionally used for these purposes.
Furthermore, LPG is globally abundant and available, making it a practical solution for reducing environmental harm worldwide. Many governments are incentivizing the adoption of LPG through tax breaks, subsidies, and regulatory support, recognizing its role in promoting sustainability and energy security.
While LPG conversion offers these advantages, it is important to consider potential challenges, such as ensuring proper installation and addressing cold-weather performance issues. Discussing warranty implications and choosing a certified conversion specialist are essential steps in the process.
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Specialist LPG insurance providers
LPG car conversions can sometimes be seen as a risk factor by insurers, and some may refuse to offer cover based on the modifications made to the vehicle. However, there are specialist LPG insurance providers that cater to LPG-converted cars and can offer competitive quotes.
Adrian Flux
Adrian Flux is a specialist car insurance provider that offers LPG conversion insurance for a wide range of vehicles, including high-performance, 4x4, and modified cars. They have over 50 years of experience in arranging high-quality insurance for car lovers with unusual vehicles. Their staff are knowledgeable enthusiasts who are used to finding policies to suit unique cars, and they can offer competitive quotes for LPG conversions, normally with no extra charge compared to petrol or diesel-engined cars.
PropanePro by NIP Group
PropanePro is a comprehensive insurance program specifically designed for businesses in the LPG distribution industry. It offers protection for businesses involved in the retail delivery and sales of propane/butane to residential, commercial, industrial, or agricultural customers. Backed by an "A-" rating by A.M. Best, PropanePro provides best-in-class claims handling and tailored risk control services, giving businesses peace of mind.
When considering LPG conversion, it is important to shop around for insurance and speak to specialists in the field. While some insurers may view LPG conversions as a risk, others recognize the benefits of LPG, including the potential for reduced fuel costs and lower environmental impact. By choosing a certified LPG conversion specialist and discussing warranty implications beforehand, you can help ensure that your LPG conversion does not result in excessive insurance premium increases.
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Frequently asked questions
Yes, LPG conversion affects insurance. Insurers may view the LPG system as an additional risk factor and may increase your premium. However, some insurance companies offer specialist policies for LPG-converted cars, which can help mitigate excessive premium increases.
Yes, LPG conversion is considered a vehicle modification, so you must inform your insurer. Failure to do so may invalidate your insurance policy.
It depends on your insurance company and policy. Some insurance companies may increase your premium due to the perceived additional risk of LPG conversion. However, other insurance companies specialise in offering competitive quotes for modified cars, including LPG conversions, and may not charge any extra compared to petrol or diesel-engined cars.
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