Regan Brown
There are differing opinions on whether you should turn off a diesel engine when refueling. Some people believe that it is unnecessary to turn off the engine, especially if the vehicle has been towing or running for a long time, as it allows the turbo to cool down. Others argue that it is better to turn off the engine to prevent unnecessary idling, which can be harmful to newer diesel engines. Some also argue that it is a safety precaution, although this may be a throwback to older ignition systems. In some places, it is a legal requirement to turn off the engine when refueling.
| Characteristics | Values |
|---|---|
| Safety | Some sources say that turning off a diesel engine while fuelling is a safety precaution, but this is likely outdated advice. |
| Health | While diesel exhaust is not good for a person's health, turning off the engine while fuelling may not make a significant difference. |
| Law | In some states and countries, it is illegal or a legal grey area to leave a diesel engine running while fuelling. |
| Engine Temperature | Some people leave their diesel engines running while fuelling to prevent the engine from cooling down too quickly, especially after a heavy load. |
| Convenience | Some people leave their engines running for convenience, such as keeping the air conditioning running or avoiding the hassle of restarting the engine. |
| Fuel Consumption | Diesel engines use very little fuel when idling, but leaving the engine running while fuelling may waste a small amount of fuel. |
| Engine Wear and Tear | Opinions vary on whether turning off a diesel engine while fuelling reduces engine wear and tear or has no significant effect. |
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Safety precautions
There are several safety precautions to consider when refuelling a diesel vehicle. Firstly, it is important to be aware of the potential risks associated with diesel fuel. While diesel has a higher flash point than gasoline and is less flammable, it is still combustible at high temperatures (100-204°F). Therefore, it is crucial to avoid any sources of ignition, such as cigarettes or open flames, when refuelling.
Additionally, it is recommended to turn off the engine when refuelling a diesel vehicle. This is a safety precaution that is typically required by state or federal laws. Turning off the engine reduces the risk of fire or explosion, especially when refuelling near gasoline pumps, as gasoline fumes are highly flammable. Leaving the engine running may also increase the risk of inhaling exhaust fumes, which can be harmful to your health.
Furthermore, it is important to allow the engine to cool down before refuelling, especially if the vehicle has been driven at high speeds or under heavy load. This is particularly important for turbo-charged diesel engines, as the turbocharger needs to cool down by circulating oil, even after a short drive. However, it is recommended to limit extended idling, especially in newer diesel engines with emission control systems, as it can be harmful to the system and increase emissions.
When refuelling, it is crucial to avoid any spills or splashing of fuel, as it can cause ignition issues and damage to the engine. It is also important to avoid blipping the throttle before shutdown, as it can cause the turbocharger to spool and continue spinning even after the engine oil circulation has stopped, which can be damaging.
Lastly, it is recommended to be mindful of your surroundings and maintain a safe distance from other vehicles when refuelling. This helps to reduce the risk of accidents and ensures the safety of both yourself and other individuals at the fuelling station.
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Federal law
In the United States, there are federal laws and regulations that govern the storage, handling, and transportation of diesel fuel. These laws are designed to ensure the safe and proper management of diesel fuel to protect human health, the environment, and prevent accidents.
One critical federal law regarding diesel fuel is the "Transport of Diesel Fuel" regulation, codified in the Electronic Code of Federal Regulations (e-CFR). This law includes several provisions to ensure the safe transportation of diesel fuel:
- Storage and Handling: Diesel fuel must be stored and handled in accordance with specific requirements outlined in the e-CFR (§75.1902 - §75.1906). These requirements include guidelines for storage facilities, transportation units, and safety measures to prevent leaks and spills.
- Safety Cans: Only one safety can of diesel fuel is permitted per vehicle during transport. These safety cans must be protected from damage and stored in permanent underground diesel fuel storage facilities. Leaking safety cans must be promptly removed from the mine.
- Marking and Labelling: Diesel fuel transportation units and safety cans must be conspicuously marked and labelled as containing diesel fuel to ensure proper identification and handling.
- Quantity Limitations: Diesel fuel transportation units are restricted to transporting no more than 500 gallons of diesel fuel at a time. This limit helps reduce the potential impact of spills or accidents.
- Tank Specifications: Tanks on diesel fuel transportation units must be permanently fixed to the unit and have a total capacity not exceeding 500 gallons. This ensures the secure containment of diesel fuel during transport.
- Fire Suppression: Non-self-propelled diesel fuel transportation units with electrical components for fuel dispensing must be protected by a fire suppression device that meets specific standards. This measure helps prevent and mitigate potential fires or explosions.
In addition to federal laws, individual states have their own laws and regulations regarding the use and handling of diesel fuel. For example, some states require engines to be shut off before fuelling to prevent accidents and reduce the risk of fire. This is often signposted at fuel pumps, and non-compliance may result in fines or other penalties.
While the primary focus of these federal laws is on the safe transportation and storage of diesel fuel, they also indirectly impact the fuelling process at gas stations. By regulating the amount of diesel fuel transported, the marking of containers, and the use of fire suppression devices, these laws contribute to a safer environment when fuelling diesel vehicles.
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Engine temperature
Diesel engines are less likely to ignite than gasoline engines. Diesel has a higher ignition temperature and a flashpoint of 100-204°F, placing it in the combustible category. However, diesel engines should still be turned off when fuelling as a safety precaution. This is especially important if you are fuelling near a spark or a lit cigarette.
Some people choose to leave their diesel engines running when fuelling to avoid placing strain on the starter and to keep the air conditioning running. However, this is not recommended as it wastes fuel and can contribute to engine sludge.
If you have been driving your diesel engine hard, it is a good idea to let it idle for a few minutes to allow the turbocharger to cool down. This is because the turbocharger is cooled by the flow of oil, and idling allows oil to flow into the turbocharger, preventing the build-up of sludge.
Newer diesel engines should be kept working and idling should be limited as much as possible. Short idles are usually fine, but long idles can be harmful to the system. This is because, unlike older diesel engines, newer diesel engines are more susceptible to build-up when they are not getting up to temperature.
In cold weather, it is generally recommended to keep diesel engines running to prevent damage to the engine and turbocharger from low temperatures.
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Fuel consumption
There are varying opinions on whether to turn off a diesel engine when refuelling. Some people turn off their engines when refuelling diesel, while others do not. Some people may leave their engines running to keep their air conditioning or heating on. Others may want to hear the "sweet sounds" of their diesel engines. However, it is worth noting that federal law in the United States requires all engines to be shut off during refuelling.
One reason people give for turning off their engines is to prevent unnecessary fuel consumption. Modern diesel engines have idle fuel-conserving technology, so leaving the engine running may not significantly impact fuel consumption. However, some argue that it is still a waste of fuel.
Another reason for turning off the engine is safety. Diesel has a high flashpoint, so the risk of refueling a diesel engine is significantly lower than with gasoline. However, if a diesel engine is left running, there is a risk of fuel spillage, which could be dangerous. Additionally, diesel engines produce exhaust fumes, which may be harmful to inhale.
Some people choose to leave their engines running to allow the turbo to cool down with oil flow. This is especially important if the engine has been under a heavy load or running at high speeds. However, mechanics recommend limiting extended idling with newer diesel engines as it can be harmful to the system. Short idles or longer idles in cold weather are generally considered acceptable.
In conclusion, while there may be valid reasons for leaving a diesel engine running during refuelling, it is essential to consider safety, fuel consumption, and environmental concerns. Each individual should weigh these factors and make an informed decision.
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Personal preference
Whether to turn off a diesel engine when fuelling is a matter of personal preference, with several factors influencing an individual's decision. Some people choose to turn off their diesel engines out of habit, while others consider the outside temperature and leave their engines running to maintain the warmth inside the vehicle. This is especially true in extremely cold climates, such as in Canada, where turning off the engine may cause issues with restarting it.
Another factor that influences personal preference is the concern for the longevity of the vehicle's starter. Some believe that frequently turning the engine on and off can put excessive wear and tear on the starter, whereas idling the engine while fuelling can help preserve it. However, others argue that modern starters are designed to handle frequent use and that leaving the engine running is unnecessary.
Additionally, some individuals consider the potential impact on fuel consumption. While diesel engines use very little fuel when idling, some people still prefer to turn off the engine to avoid any unnecessary fuel usage during the fuelling process.
The type of vehicle and its specific features also play a role in personal preference. For example, some diesel engines have turbochargers that require proper cool-down periods. In such cases, individuals may choose to leave the engine running while fuelling to ensure the turbocharger receives adequate oil flow to prevent overheating.
Lastly, personal preference may be influenced by safety considerations. While diesel fuel has a higher flash point and is less flammable than gasoline, some individuals still prefer to err on the side of caution and turn off their engines when fuelling to minimise any potential risk of ignition.
In conclusion, the decision to turn off a diesel engine when fuelling is influenced by a combination of factors, including personal habits, climate considerations, concerns about vehicle maintenance, fuel consumption, vehicle features, and safety precautions. Ultimately, it is up to the individual to weigh these factors and make a choice that aligns with their priorities and preferences.
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Frequently asked questions
Diesel has a high flash point, so there is a significantly lower risk of it igniting compared to gasoline. However, if a diesel engine is left running while refueling, there is a risk of deposits forming in the pre-combustion chambers, main chambers, and injectors.
It is a federal law in the US to shut off all engines when fueling. Some states are making it illegal to allow a truck to idle at truck stops.
Some people leave their diesel engines running to prevent cylinder wash down, to keep the turbo cool, and to avoid putting wear and tear on the starter.
Some people turn off their diesel engines while refueling out of habit or for safety reasons.
