
When hiring a car, it's important to understand the fuel policy, which details the type and amount of fuel you should return the car with. Most policies fall under a ''pay on collection' or 'return as received' scheme. To avoid unexpected costs, it's crucial to check the fuel gauge when you first get into the rental car and take a picture if the fuel level is lower than expected. Different car models use different types of fuel, such as diesel or gasoline, and misfuelling can damage the engine and fuel system. To identify the correct fuel type, look for stickers on the car key, dashboard, fuel gauge, or inside the fuel cap. Additionally, some car model names may provide hints about the fuel type, such as labels indicating a diesel or turbocharged engine. If you're unsure, contact the rental company, as they can provide fuel specifications. When comparing rental prices, consider the cost of fuel and whether it's included or if you need to pay upfront or upon return.
| Characteristics | Values |
|---|---|
| How to identify the right fuel | Check for stickers, usually found on the car key, dashboard, fuel gauge, or inside the fuel cap cover |
| Fuel options | Pay on collection or return as received; pre-purchase full to empty; full to full (same to same); pay upfront and return empty |
| Fuel types | Gasoline (regular, mid-grade, premium), diesel, unleaded |
| Fuel policy | Check the supplier's fine print for details on the fuel provided and expected amount returned |
| Fuel charges | May be charged if the car is returned without a full tank or if the rental includes driving over a certain mileage |
| Misfueling | Filling a diesel vehicle with gasoline or vice versa can damage the engine and fuel system |
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What You'll Learn

How to tell if your hire car needs diesel or gas
Knowing which fuel to put in your hire car is essential to avoid damaging the engine and fuel system. Here are some tips to help you determine whether your hire car needs diesel or gas:
Check for Stickers
One of the easiest ways to determine the correct fuel type is to look for stickers on the car. These stickers are often found on the car key, dashboard, fuel gauge, or inside the fuel cap cover. Messages on these stickers are usually straightforward, indicating fuel type with messages like "Unleaded Gas Only" or "Diesel Only".
Examine the Car Model Name
The car model name can sometimes provide a hint about the fuel type. Many diesel cars have labels like 'D', 'TDI', 'HDi', 'GTD', 'dCi', or 'JTD'. For example, a Volkswagen Golf TDI indicates a Turbocharged Direct Injection diesel engine. These labels are typically found on the back of the car near the trunk. However, it's best not to rely solely on the model name to determine the fuel type.
Consult the Rental Company
If you're still unsure, don't hesitate to contact the rental company. They will have all the necessary information about the car's fuel specifications and will be able to guide you accurately.
Check the Instrument Cluster
Examine the digital dash or instrument cluster of the car. Sometimes, there may be written information indicating the type of fuel the car uses.
Refer to the Car's Documents
Check the vehicle's documents, such as the owner's manual. Look for the section on fluids, where the type and grade of fuel required should be clearly indicated.
Call the Car's Helpline
Most cars have a helpline number listed on the front or back of the vehicle. You can call this number and provide details like the make, model, year, and VIN number to get accurate information about the fuel type.
Remember, it's always better to take the time to confirm the correct fuel type rather than risk misfuelling, which can cause significant damage to the vehicle.
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Understanding your hire car's fuel policy
There are several fuel policy options to choose from, depending on your preferences and budget. The 'Full to Full' or 'Same to Same' option is great value for money as it has no surcharges or inflated fuel prices. This is a good choice if you plan to do a lot of driving. However, it is important to note that you will need to refuel the car before returning it to avoid additional charges.
Another option is the ''Pre-purchase Full to Empty' policy, which is more expensive but convenient if you don't want to have to worry about refuelling. With this option, you pay upfront for the fuel and can return the car without having to fill up the tank.
Some companies also offer a 'Fuel Included' option, where you pay for the fuel upfront as part of the rental cost. This can be a convenient choice if you don't want to worry about refuelling during your trip.
It is important to always check the fuel gauge when you first get into the rental car. Take a picture if the tank is not full, so you have evidence of the initial fuel level. Find out the charges for returning the car with less fuel than expected, as well as any potential refunds for returning the car with a full tank.
Additionally, make sure you know the correct fuel type for your rental car. Misfuelling, or putting the wrong type of fuel in the car, can damage the engine and fuel system. Check for stickers on the car key, dashboard, fuel gauge, or inside the fuel cap cover. The vehicle owner's manual or electronic handbook may also specify the required fuel type.
By understanding your hire car's fuel policy and taking note of the initial fuel level, you can make informed choices and avoid any unexpected charges during your rental period.
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What to do if you put the wrong fuel in your hire car
Putting the wrong fuel in your hire car can be a costly mistake, but it's a common one. The AA claims that UK motorists accidentally use the wrong pump every 3.5 minutes on average, and the RAC puts this figure at every three minutes.
If you realise the mistake before driving off, do not start the ignition or attempt to drive. Switching on the ignition will mix the two fuels together within the fuel system, potentially causing serious damage to your car and its engine. You will need to remove all the diesel or petrol from your tank and replace it with the correct fuel before you can start your car.
If you have put diesel in a petrol engine, follow these steps to drain your engine:
- Lift up your bonnet.
- Remove the air filter housing so that you can expose the carburettor.
- Drain the fuel tank. All fuel tanks have at least two fuel lines attached.
- Determine whether your engine uses a mechanical or an electric fuel pump. Mechanical pumps are bolted onto the engine block or the cylinder head. Electric pumps can be located anywhere but they are usually submerged in the fuel at the bottom of the fuel tank.
- Locate and remove the fuel line from the carburettor that is supplying the fuel. It will be connected to the fuel filter, which may be visible.
If the car has an electric fuel pump, you may be able to short circuit the wire from the horn or hazard warning or blower circuit into the electric fuel pump circuit after removing two fuses. If you fit a bottle over the end of the line, the pump should then empty out the fuel line.
If you have put petrol in a diesel engine, the method is much the same, but you won't be able to use a bottle. A small amount of petrol in a diesel car will do little harm and could even help to clean the engine. If the engine does not have an electric pump, you could use one from a scrap car.
To avoid putting the wrong fuel in your hire car in the first place, it's a good idea to remind yourself that the vehicle is different and may need different fuel. If you own a diesel-powered model, have an accessory fitted that makes it impossible to put a petrol nozzle into the tank. Also, pay attention at the pump. Eliminate distractions and carefully review each button and/or nozzle to make sure you know which fuel type you are choosing.
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Where to find the fuel type listed on your hire car
If you're unsure about the fuel type your hire car uses, there are several places you can check. One of the easiest ways is to look for stickers—these can often be found on the car key, dashboard, fuel gauge, or inside the fuel cap cover. Some cars may also have labels near the trunk or on the back of the car, which can indicate the fuel type. For example, diesel cars often have labels such as "D," "TDI," "HDi," or similar variations.
You can also refer to the car's documentation, which can usually be found in the glovebox or the driver's side door pocket. The vehicle owner's manual or user's manual may provide information on the recommended fuel type. Additionally, you can check the fuel filler flap, which may indicate specific fuel requirements such as "unleaded gasoline only" or "diesel only," along with minimum octane or centane ratings.
Another way to identify the fuel type is by looking at the fuel tank. The diesel tank neck is typically larger than the gasoline tank neck, and the diesel pump nozzle will not fit easily into a gasoline tank. The fuel type may also be displayed on the tank head cap.
If you're still unsure, you can always contact the rental car company, as they will have all the fuel specifications for your vehicle and can provide guidance on the appropriate fuel type for your hire car.
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How to avoid additional costs when refuelling your hire car
When renting a car, you may have to pay additional fees beyond the vehicle's cost. Rental companies often charge extra for things like airport surcharges, auto insurance, and additional drivers. To avoid unexpected costs when refuelling your hire car, consider the following:
Check the fuel policy
Before renting a car, be sure to understand the fuel policy. Most policies fall under a "pay on collection" or "return as received" scheme. Some companies offer a "full to full" option, where you pay upfront for a full tank of fuel and return the car with a full tank. This option can provide value for money as there are no surcharges or inflated fuel prices. Alternatively, some companies offer a "pre-purchase full to empty" option, where you pay upfront for a full tank and return the car empty. However, this option is usually not budget-friendly, as you will pay more for the convenience of not having to refill the tank.
Be mindful of mileage caps
Some rental agreements have a mileage cap, and driving over this limit incurs extra charges. To avoid excess mileage fees, choose a rental company that offers unlimited mileage or more mileage than you need. Contact the rental company directly to understand their policy.
Refuel the car yourself
If you choose not to pre-purchase fuel, be sure to refuel the car before returning it. Returning the car with less fuel than when you picked it up will result in a refuelling service charge. The price per gallon or litre will likely be higher than local fuel prices.
Take pictures and note the fuel gauge
When you first get into the car, check the fuel gauge and take pictures if the tank is not full. This will help you know how much fuel you need to refill before returning the car. Additionally, taking pictures of the car's condition before driving it can help you avoid being charged for damage you are not aware of.
Stick to your rental schedule
Returning the car outside the agreed-upon time can lead to unexpected charges. If you need to change the return time, contact the rental company in advance to understand the associated costs.
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Frequently asked questions
Rental companies offer a few different fuel options. These include returning the vehicle with a full tank of gas, paying the company for gas used, or opting for the 'Fuel Included' option.
One of the easiest ways to tell if your car runs on diesel or gas is to check for stickers. These are often found on the car key, dashboard, fuel gauge, or inside the fuel cap cover. Some car model names can also hint at the type of fuel a car uses. For example, many diesel cars have labels like 'D’, 'TDI’, 'HDi’, 'GTD’, 'dCi’, or 'JTD'.
Most gas stations offer three grades of gasoline: regular, mid-grade, and premium. Unless the rental car company specified using premium fuel, it’s okay to use regular gas. The only time you need to use premium is if your car’s manual requires it.
Misfueling can damage the engine and fuel system, so it is important to avoid. If you mistakenly put diesel fuel in a car that requires gasoline, do not start the car. Instead, move the car to a safe place and inform the rental car company. They will instruct you on where to return the vehicle.
A fuel policy details what fuel the rental company provides you with and how much fuel they expect to be returned with the car. Most policies fall under a pay-on-collection scheme or return-as-received. When deciding which fuel policy is best for you, consider the type of trip you are taking, how far you’re driving, and if you’re looking for convenience rather than cost.











































