
If you're renting a truck, it's important to know how and where to fuel it. While some rental companies like U-Haul® mainly offer vehicles that run on unleaded gasoline, others like Penske® provide a variety of diesel and unleaded gasoline trucks. Diesel engines are more powerful and efficient, emitting less carbon dioxide, and costing less per driving mile. However, diesel engines are generally more expensive. Before renting, it's essential to consider the advantages of each fuel type and the availability of fueling stations to avoid disruptions during your trip. Always refer to the rental agreement or the equipment itself to identify the correct fuel type and fill up the tank accordingly.
| Characteristics | Values |
|---|---|
| Fuel type | Diesel |
| Fuel cost estimation | Trip distance, average price of fuel, miles per gallon (MPG) the truck gets |
| Fuel economy | Better in diesel trucks compared to gas trucks |
| Engine durability | Better in diesel trucks |
| Engine maintenance | Less frequent in diesel trucks |
| Environmental impact | Diesel engines emit less carbon dioxide |
| Fueling location | Diesel fuel pumps |
| Fueling instructions | Confirm the type of fuel, check fuel levels, ensure the clearance level at the gas pump |
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What You'll Learn

Identifying the correct fuel type
Firstly, check the rental agreement or the equipment itself for the specified fuel type. Rental companies provide this information, and it is usually clearly stated. For instance, U-Haul trucks typically run on unleaded gasoline, while some companies offer diesel trucks.
Next, look for stickers on the vehicle, which can be found on the car key, dashboard, fuel gauge, or inside the fuel cap cover. These stickers usually have straightforward messages like 'Unleaded Gas Only' or 'Diesel Only'. Additionally, some car model names can indicate the fuel type. For example, labels like 'TDI' or 'dCi' often signify a diesel engine.
You can also rely on your senses. Diesel engines often produce stronger vibrations and emit darker, thicker smoke than gasoline engines. Additionally, check the dashboard for icons or text indicating the fuel type during ignition.
Finally, pay attention to the size of the fuel pump nozzle. Diesel nozzles are slightly thicker than gasoline nozzles, so if you're having trouble inserting a diesel nozzle, it's likely a gasoline truck. Remember, if you're ever in doubt, don't hesitate to contact the rental company for clarification. They will be able to provide you with accurate fuel specifications to ensure a safe and smooth journey.
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Finding diesel fuel pumps
It is important to identify which type of fuel your rental truck needs before refuelling. For example, U-Haul trucks generally operate on unleaded gasoline, while Penske offers trucks that run on diesel fuel. You can usually find this information in the rental agreement, or on a sticker near the fuel tank, the sun visor inside the cab, or the driver's side door.
Once you know that your rental truck requires diesel, you need to locate a gas station with diesel fuel pumps. In the US, for example, unleaded gasoline is more widely available than diesel fuel.
When you arrive at the gas station, you need to locate the diesel fuel pumps. These are usually marked clearly and are often a different colour to the unleaded gasoline pumps. You should also check that the fuel pump you are using is compatible with your vehicle. There are several different kinds of fuel pumps, including rotary, inline, and high-pressure common rail.
If you are unsure about whether your rental truck requires diesel or unleaded gasoline, you should contact the rental company for clarification. It is important to use the correct fuel type, as using the wrong type of fuel can cause mechanical failure and serious engine damage.
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Avoiding fuel contamination
When renting a diesel truck, it is important to be aware of the risk of fuel contamination and how to avoid it. Diesel fuel contamination can cause serious harm to engines and tanks, leading to costly repairs and even environmental damage. Here are some tips to help you avoid fuel contamination when renting and fuelling a diesel truck:
Firstly, always confirm the type of fuel your rental truck needs before refueling. Most rental companies will label their trucks with the required fuel type, usually near the fuel tank or on a sticker inside the cab. It is crucial to check this information to avoid mistakenly using the wrong type of fuel, which can lead to mechanical failure and engine damage.
Secondly, pay attention to the fuel stations you use. Choose reputable stations that have diesel fuel pumps and are known for their fuel quality. Avoid filling up from a station if you notice any signs of contamination, such as water or impurities in the fuel. Condensation and changes in temperature can introduce water into the fuel, creating favourable conditions for microbial growth and contamination.
Regularly check your fuel filters and fuel pump for any signs of clogging or malfunction. Contaminants like dirt, rust, microbes, or water can accumulate on the filter media, restricting fuel flow and affecting engine performance. A sudden increase in filter clogging or unusual pump behaviour may indicate fuel contamination.
Additionally, be cautious when handling and storing diesel fuel. Use clean and dedicated equipment, such as funnels, pumps, containers, and hoses, to avoid introducing contaminants into the fuel. Ensure that the diesel exhaust fluid (DEF) levels are above 1/4 tank and check for any signs of DEF contamination, as it can damage the catalytic system of your rental vehicle.
Finally, consider using fuel test kits to detect contamination early. Testing your fuel regularly is a cost-effective way to identify issues before they become serious problems. Immunoassay antibody tests, for example, are quick, easy to use, and can reliably detect specific microbes that threaten diesel fuel.
By following these precautions, you can help prevent fuel contamination and ensure a smoother rental experience with your diesel truck. Remember to always refer to your rental company's guidelines and seek assistance if you have any questions or concerns about fuelling your rental vehicle.
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Estimating fuel costs
When renting a diesel truck, it's important to estimate the fuel costs to avoid any surprises. Here are some detailed steps and tips to help you estimate the fuel costs for your rental truck:
Understanding the Basics
First, you need to know three key factors: the trip distance, the average price of diesel fuel, and the truck's fuel efficiency or miles per gallon (MPG). The fuel efficiency of a truck can usually be found in the vehicle's specifications or manual. It's a good idea to check the rental company's website or contact them directly to get this information.
Calculating Fuel Costs
Now, let's estimate the fuel costs using a simple formula. Take the distance of your trip and divide it by the truck's fuel efficiency (MPG). This will give you the number of gallons of fuel you'll need. For example, if your trip is 850 miles and the truck gets 10 miles per gallon, you'll need 85 gallons of fuel (850 miles / 10 MPG = 85 gallons).
Next, multiply the number of gallons by the average price of diesel fuel. Using the previous example, if the diesel price is $3.50 per gallon, your fuel cost would be $297.50 (85 gallons x $3.50 = $297.50).
Improving Accuracy
Keep in mind that several factors can affect fuel efficiency, such as driving speed, sudden acceleration, and frequent stops. Maintaining a steady speed, avoiding aggressive driving, and using cruise control can improve fuel efficiency and reduce fuel consumption. Additionally, prices of fuel can vary across locations, so if your trip involves travelling to different states or regions, be sure to factor that into your calculations.
Using Online Tools
To make your life easier, consider using online fuel cost calculators. Websites like U-Pack and Drivewyze offer user-friendly calculators specifically designed for rental trucks. These tools can help you estimate fuel costs by taking into account factors such as distance, fuel efficiency, and fuel prices.
Rental Company Guidance
Finally, don't forget to check with your rental company for guidance. Some companies, like U-Haul, provide a fuel estimator on the rental contract, which helps you determine the amount of fuel needed to return the truck to the original dispatch level. By following these steps and using the provided tools, you can accurately estimate the fuel costs for your diesel rental truck and make informed decisions for your trip or move.
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Returning the truck with the same fuel level
Firstly, before embarking on your journey, take note of the current fuel gauge reading. This reading will serve as a reference point for refuelling when you need to return the truck. It is also wise to confirm the type of fuel your rental truck requires. Different rental companies offer vehicles that run on diesel or unleaded gasoline. For instance, U-Haul trucks primarily operate on unleaded gasoline, while Penske provides labelled trucks with stickers near the fuel tank and fueling information inside the cab to guide you.
Next, when your trip is nearing its end, locate a suitable refuelling station. If your rental truck requires diesel, ensure the station has diesel fuel pumps. It is worth mentioning that diesel exhaust fluid (DEF) is not the same as diesel fuel. DEF is meant to lower harmful emission gases from diesel engines and should not be mixed with diesel fuel.
Once you have refuelled the truck to the same level as indicated on your contract, you can return it to the rental location. This process ensures that you comply with the rental agreement and helps you manage your budget effectively. Additionally, some rental companies, like U-Haul, provide a fuel estimator on the contract, making it easier to determine how much fuel is needed to return the truck to the dispatch level.
Finally, it is beneficial to be mindful of other fuel-related considerations. For instance, maintaining a steady driving speed, avoiding sudden accelerations and decelerations, and distributing weight evenly in the truck can all contribute to maximising fuel efficiency. Additionally, keeping the DEF levels above a quarter of a tank is essential to prevent potential engine damage. By following these steps and staying vigilant, you can ensure a smooth and cost-effective rental experience.
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Frequently asked questions
Check the rental agreement or the equipment itself. Some rental companies label their trucks in various areas to ensure you make the right fuel choice. For example, Penske has stickers near the fuel tank and on the sun visor inside the cab. U-Haul trucks have a decal near the gas cap that shows the proper fuel type.
You will need to pay attention to which fueling stations have diesel fuel pumps. U-Haul recommends unleaded gasoline trucks due to their accessibility across the country. However, if you are renting a diesel truck, you will need to seek out diesel fuel stations.
Ensure you are using the correct fuel type and that the DEF and fuel levels are above 1/4 tank before conducting DPF regeneration. Be sure the clearance level at your gas pump won't damage the truck.
The cost of fueling a rental truck depends on the trip distance, the average price of fuel, and the truck's miles per gallon (MPG). You can use a fuel calculator online to estimate the cost. For example, if you're driving 850 miles in a U-Haul truck that gets 10 MPG, and gas averages $2.50, you should budget around $212.50 for gas.











































