Rajan Wilcox
While it is tempting to keep your car running while filling up, it is not recommended. In the UK, there are no laws that require you to turn off your engine while refuelling, but it is generally advised against. This is because a running engine can create ignition risks, especially in older cars that are not well maintained. Electrical leaks from old spark plug leads or other electrical wires can cause sparks, which are especially hazardous when filling up with petrol. Petrol fuel also combusts more quickly than diesel, so filling a petrol car while the engine is running poses a greater threat. Additionally, turning off your engine while refuelling can help prevent theft and is simply good practice.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Is it dangerous to refuel a car with the engine running? | It is generally advised not to refuel a car with the engine running due to the risk of ignition from sparks or static electricity. However, some people have shared their experiences of doing so without any issues. |
| Legal implications | There are no specific laws in the UK prohibiting refuelling a car with the engine running. However, there may be laws regarding leaving a car unlocked and unattended. |
| Safety recommendations | It is recommended to turn off the engine while refuelling to minimise the risk of fire and to comply with the International Fire Code. |
| Alternative options | If the car battery is not functioning properly, it is suggested to seek assistance from a breakdown service or to push the car to the forecourt. |
| Static electricity risks | Static electricity is a potential hazard during refuelling, but it is primarily caused by entering and exiting the vehicle, not by the engine running. |
| Mobile phone usage | Using a mobile phone while refuelling is generally not considered a fire hazard, according to scientific testing by the NFPA and FCC. |
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What You'll Learn
Static electricity and sparks
While the risk is small, static electricity can ignite gasoline vapours at the pump. This is because static electricity can be generated when you exit your car and touch the nozzle, credit card, or fill cap, providing a source of ignition for the gasoline vapours coming out of the fill pipe.
Bob Renkes, executive vice-president at the Petroleum Equipment Institute, explains that when you exit your car, you first touch the door, which discharges any static electricity. However, when you then touch the nozzle, credit card, or fill cap, the static electricity can discharge from your hand to the nozzle, igniting the vapours. This is more likely to occur in older cars without vapour recovery technology, which captures and controls vapours to prevent them from escaping and igniting.
While the risk is small, it is still recommended to turn off your engine when refuelling as a precaution. This is because a running engine can create an additional source of ignition through its electrical system and spark plugs, increasing the risk of a fire.
In addition to turning off the engine, you can also take other precautions to minimise the risk of static electricity sparks. For example, you can touch a piece of metal away from the filling port before touching the nozzle, which will help dissipate any static electricity.
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Petrol vs diesel engines
In the UK, it is not recommended to refuel a car with the engine running. While some people have done it without any issues, there is a small risk of stray sparks from the ignition system of a petrol engine igniting fuel vapour. Diesel engines do not have this issue as they do not have spark plugs. However, it is good practice to switch off the engine when refuelling, as it is safer and also prevents the possibility of the car being stolen while you are inside paying.
Now, onto the comparison of petrol vs diesel engines. Both gasoline and diesel engines are internal combustion engines, meaning they use the same basic process of air entering the engine and combining with fuel, which is then ignited to trigger the motion of the piston and crankshaft. However, there are some key differences between the two types of engines.
The main difference lies in the ignition process. Petrol engines are "spark ignition" engines, meaning they use spark plugs to ignite the fuel. On the other hand, diesel engines use extreme compression to generate the heat required for spontaneous ignition, also known as compression ignition. This makes diesel engines more efficient than petrol engines, especially for highway driving. Diesel fuel simply packs more energy into every gallon, making it more economical overall. Diesel engines also have more torque, resulting in better fuel economy and acceleration.
However, diesel engines are typically more expensive than petrol models, costing up to several thousand dollars more. They are also more complex, making them more challenging to repair if something goes wrong. Diesel fuel also tends to be more expensive, and with increased emissions regulations, the advantages of diesel consumption drop off if the vehicle is not idle for long periods. In some cases, older diesel vehicles may even be banned from city centres due to emissions concerns.
The choice between petrol and diesel engines ultimately depends on various factors such as location, driving habits, and personal preferences. Petrol engines are generally more popular, especially in the US, but diesel engines have a significant market share in Europe. Diesel engines are favoured for their efficiency and performance, while petrol engines are preferred for their lower cost and easier maintenance.
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Phone usage at petrol stations
While refuelling your car at a petrol station, you will likely see signs prohibiting the use of mobile phones. This is because of the widely held belief that a mobile phone's electrical components could generate a spark, potentially igniting the fuel when mixed with petrol vapour and air.
However, this is largely considered to be an urban myth. The Australian Mobile Telecommunications Association has stated that "there is no sound technical basis to prohibit the use of mobile phones at petrol stations or single them out as hazards". Shell Oil UK also found that "portable cellphones properly used do not represent a meaningful hazard on the retail forecourt".
Despite this, fuel companies continue to enforce rules prohibiting phone usage, and many petrol stations advise against taking your phone out of your car when refuelling, citing potential safety concerns. Queensland's government has even released a fact sheet advising motorists to switch off their engines and apply the handbrake when refuelling, to avoid the risk of static electricity igniting the petrol vapour.
While the risk of mobile phones causing a fire is small, petrol stations prefer to err on the side of caution.
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Entering and exiting your car
When entering and exiting your car during refuelling, it is important to be aware of the potential risks involved. While it may be tempting to keep your engine running while refuelling your car, it is generally recommended to turn it off for safety reasons.
One of the main risks associated with refuelling a car with the engine running is the potential for ignition due to sparks or hot components. This is especially true for older cars that may have faulty spark plugs or electrical faults. In petrol engines, sparks from the ignition system can ignite fuel vapours, leading to a possible combustion. Therefore, it is advisable to switch off the engine before refuelling to eliminate this risk.
Another important consideration is the build-up and release of static electricity when entering and exiting your vehicle. Sliding across the car's seats can generate static electricity, which can then be transferred to the metal fuel nozzle, potentially causing a tiny spark and leading to an explosion. To minimise this risk, it is recommended to ground yourself before touching the nozzle. This can be done by touching a metal part of your car with your bare hand after exiting, such as the door or any other metal surface away from the fuel filler.
Additionally, it is worth noting that leaving your car running while refuelling can also increase the risk of theft, as it is easier for someone to drive away with your vehicle if the engine is already on. Therefore, turning off your engine not only reduces the risk of fire but also helps to secure your vehicle.
While the chances of an accident occurring due to these risks may be low, it is always better to err on the side of caution. By taking simple precautions, such as turning off the engine and grounding yourself before refuelling, you can help ensure a safe and uneventful refuelling process.
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Safety precautions and risks
It is generally advised that you should not refuel your car with the engine running. While it may be tempting to do so, it is a risk to public safety. Petrol engines are "spark ignition" engines, and any stray sparks from the ignition system could ignite fuel vapours. This risk is heightened if your car has faulty spark plugs, as unburnt fuel can make its way into the converter, causing red-hot particles to be expelled from your exhaust pipe. In addition, electrical faults like shorts and worn insulation can also be an ignition source at the pump if a spark occurs.
One of the main reasons it is recommended to turn off your car engine before refuelling is to minimise the electricity flowing through its wiring harness. Even with the car turned off, some wires, like those connected to cigarette lighters or USB ports, may still be powered. Therefore, it is advisable to unplug any charging cords or electronic accessories before refuelling, especially if they are worn or damaged.
Static electricity is another potential hazard when refuelling your car. It can be generated when you enter and exit your vehicle during the refuelling process, by sliding across the seats and then touching the metal fuel nozzle. This can result in a tiny, explosion-inducing spark. To avoid this, you should ground yourself before reaching for the fuel nozzle. This can be done by touching a metal part of your car with your bare hand after exiting, such as the door or any other metal surface, as long as it is not near the fuel filler.
While the risk of an accident may be low, it is still better to err on the side of caution and turn off your engine when refuelling. This is especially important if you have children in the car, as you never know when they might try to imitate you and start the car while you are not there. Additionally, leaving your car running, unlocked, and unsupervised makes it vulnerable to theft.
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Frequently asked questions
While some people claim to have refuelled their cars with the engine running without any issues, it is generally advised against. This is because a running engine can create ignition risks like sparks from faulty spark plugs or a red-hot exhaust, which can cause a fire or explosion.
It is recommended that you turn off your engine before refuelling to minimise the risk of ignition. You should also avoid using your phone or smoking while refuelling, as these activities can also increase the risk of fire or explosion. Additionally, if you have children in the car, it is advised to turn off the engine and lock the car when leaving it unattended during refuelling to prevent any accidents or theft.
Petrol engines use spark plugs for combustion, so they pose a higher risk of fire or explosion during refuelling compared to diesel engines. Diesel engines combust by spraying fuel into high-temperature compressed air, which is less likely to ignite with fuel vapours. However, it is important to note that both types of engines can be hazardous if not handled properly during refuelling.
