Can You Leave a Diesel Truck Running While Fueling? Find Out Here

If you own a diesel truck, you might wonder whether you can leave it running while refueling with diesel. The answer is yes, but there are precautions you should take to prevent potential hazards. Here are some things to keep in mind:

  1. Ensure your diesel truck is in park or neutral before refueling. Diesel trucks are heavier than gasoline trucks and can roll if not in park or neutral.
  2. Never smoke while refueling a diesel truck. Diesel fuel is highly flammable, and smoking could cause diesel fuel to ignite.
  3. Keep an eye on the diesel fuel pump, which can overheat and catch fire if running too long.
  4. Turn off any auxiliary fans that might be running. This will prevent diesel fuel from getting into the fan and causing it to catch fire.

While these precautions will help you safely refuel your diesel truck while running, it’s always safer to turn it off before refueling.


What Are Diesel Trucks Typically Used For?

Diesel trucks are primarily used for towing and hauling, thanks to their higher torque than gasoline trucks. They are also known for their durability and fuel efficiency, making them an ideal choice for tough jobs that require more power and fuel economy.

Do You Need to Use Diesel Fuel in a Diesel Truck?

Diesel trucks require diesel fuel since their engines are designed to run on them. Diesel fuel has a higher energy density and is heavier than gasoline, which means that diesel engines can get more power from diesel fuel than gasoline engines. Understanding what and how to fuel a diesel truck is essential to avoid running out of fuel.

Does Diesel Ignite With a Flame?

Yes, diesel can ignite with a flame, and it is known for being one of the most flammable fuels available. This makes it crucial to be cautious when refueling a diesel truck to prevent the possibility of causing a fire.

How Long Can a Diesel Truck Idle For?

A diesel truck can idle for approximately an hour without any issues. However, if you plan to leave it idle for an extended period, you must ensure that the diesel fuel pump does not overheat, which can lead to a fire. It is best to avoid idling for long periods when possible.

Is Diesel Safer Than Gasoline?

Diesel is not necessarily safer than gasoline since it is highly flammable. However, diesel engines are typically more durable and can last longer than gasoline engines.

What Are the Disadvantages of Diesel?

The primary disadvantage of diesel is its flammability, which requires extra care when handling diesel fuel. Additionally, diesel fuel can be more expensive than gasoline. Diesel engines are also louder than gasoline engines and produce more emissions.

What Are the Advantages of Diesel Trucks?

Diesel trucks have several advantages over gasoline trucks, including greater durability and longevity. Diesel engines are more efficient than gasoline engines, providing better fuel economy. Additionally, diesel trucks produce fewer emissions, which benefits the environment. However, diesel trucks can be more expensive than gasoline trucks. Some people opt for gasoline trucks instead.

Are Diesel Fumes Safe to Breathe?

Diesel fumes are not safe to breathe. They contain various toxins, such as carbon monoxide and nitrogen oxide, which can cause respiratory problems and cancer. To avoid breathing in diesel fumes, staying away from diesel engines as much as possible is recommended.

Do You Need to Warm up a Diesel Truck Before Use?

Yes, you need to warm up a diesel truck before use. Diesel engines tend to be more efficient when warm. Warming up a diesel engine helps to improve the combustion process and can also help prevent engine damage.

How Long Should You Let a Diesel Cool Down?

It is essential to let a diesel truck cool down for at least five minutes before turning it off. Diesel engines produce a lot of heat when running, and turning off the engine too soon can cause damage.

How to Store Diesel Fuel

When storing diesel fuel, keeping a few things in mind is essential:

  1. Ensure the diesel fuel is stored in an airtight and sealed container to avoid evaporation.
  2. Store the diesel fuel in a dry place, preferably above ground, to prevent freezing and becoming dangerous to people.
  3. Ensure that the diesel fuel is not stored near any heat sources.

It is highly flammable and can easily catch fire if exposed to heat.

How Cold Does It Have To Be for Diesel to Gel?

Diesel can gel at temperatures as low as 32 degrees Fahrenheit. To prevent diesel fuel from gelling, add a diesel fuel additive to the power or store the diesel fuel in a warm place.

Is It Expensive to Fuel a Diesel Truck?

Diesel trucks are more expensive to fuel than gasoline trucks. Diesel trucks can get better fuel economy than gasoline trucks as diesel engines are more efficient than gasoline engines. Diesel is also generally less expensive than gasoline, making it more cost-effective in the long run.


When dealing with diesel fuel and diesel engines, safety should always be the top priority. Diesel fuel is highly flammable, and diesel fumes harm health, so taking necessary precautions is crucial. By following the tips on diesel truck usage, storage, and fueling discussed in this article, you can ensure a safer and more efficient experience with diesel.

About the author, Laurence Perkins

Laurence Perkins is the passionate car enthusiast behind the blog My Auto Machine. With over a decade of experience in the automotive industry, Perkins has knowledge and experience with a wide range of car makes and models. His particular interests lie in performance and modification, and his blog covers these topics in-depth. In addition to his own blog, Perkins is a respected voice in the automotive community and writes for various automotive publications. His insights and opinions on cars are highly sought-after.