Rajan Wilcox
The fuel efficiency of a car is an important factor in determining how much you spend on gas and how often you need to refuel. Owners of the Toyota Prius have discussed how much fuel is left when the fuel light starts blinking. One owner of a 2012 Prius stated that when the light blinks, the range indicator shows 40 kms (25 miles), but they have driven over 50 miles before needing to refuel. Another owner of a 2015 Prius stated that when the gauge shows empty, there is actually 2.5 gallons left. The fuel tank capacity of a 2013 Prius is 11.9 gallons, and the low fuel level warning light comes on when there is approximately 1.6 gallons left. It is recommended that owners experiment with their vehicles to understand how far they can go when the fuel light starts blinking.
| Characteristics | Values |
|---|---|
| Fuel left when the low fuel light comes on | 1.6 gallons |
| Fuel left when the fuel light starts blinking | 2.9 gallons |
| Range when the fuel light starts blinking | 40 kms or 25 miles |
| Maximum distance travelled after the fuel light starts blinking | 50 miles |
| Actual capacity of the gas tank in 2015 Prius | 12.5 gallons |
| Fuel capacity in 3rd Gen 2013 Prius | 11.9 gallons |
| Fuel economy in 2006 Prius | 45.1 mpg |
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What You'll Learn
Filling up a car with petrol
When you arrive at the petrol station, pull up next to the pump that matches the side your petrol cap is on. You can check which side your fuel cap is on by looking at your dashboard; there is usually a little pump icon next to the fuel gauge, with an arrow pointing to the side of the car where the fuel cap is located. Pull up about half a metre out from the pump, with your car's nose lining up with the end of the pump. Engage the handbrake, put the gear into neutral, and turn off the engine.
Get out of the car, taking your keys and money with you, and shut the door. Go around to the pump side of your car and locate your fuel cap. If it is locked, use your key to unlock it by putting it in and twisting to the left. You can then place the cap somewhere safe, such as on the raised edge of the pump. If your fuel cap does not require a key, you can usually just flip open the panel like a little door. Next, you will see the actual fuel cap, which you can either twist open or pop up.
Now, you can choose how to pay for your fuel. Many petrol stations offer a '"pay at pump" service, where you put your card into the chip and pin machine at the pump before filling up. If this option is not available, you can pay at the kiosk after filling up. If you are paying at the pump, insert your card and enter your PIN. Then, grab the handle and lift it upwards, then outwards to unhook the nozzle from the pump. Move to your fuel hole and put in the nozzle. Leftover fuel may dribble out, but this is nothing to worry about. Your fuel will not start coming out until you squeeze the handle. Once the nozzle is firmly in place, squeeze the handle to start fuelling. Keep an eye on the pump's screen, which will tell you how much fuel you are putting in and the cost. If you want to fill your tank, keep squeezing until you hear a 'thunk' sound.
Once you have finished fuelling, put the nozzle back, and if you paid at the pump, get back into your car and check that the fuel gauge climbs to the full position. If you paid at the kiosk, lock your car, note the pump number, and head inside to pay.
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Fuel gauges and pumps can be inaccurate
In some cases, the issue may lie with the float in the fuel tank, which moves up and down according to the fuel level. If the float becomes separated from the metal rod or arm it is attached to, the fuel gauge may not function properly. Additionally, residue build-up on the float lever can hinder its movement, resulting in inaccurate gauge readings.
Another potential cause of inaccurate fuel gauges is a faulty fuel pump. Running a vehicle with a very low level of fuel can damage the pump due to the lack of lubrication provided by the fuel. This can lead to overheating and other issues that may cause the fuel gauge to malfunction.
It is also worth noting that some vehicles are known for having inconsistent fuel consumption, with the top half of the gauge lasting for a shorter distance than the bottom half. This can be misleading for drivers who rely on the fuel gauge to determine how much fuel is left.
To address these issues, it is recommended to regularly check the fuel sending unit, float, and fuel pump for any signs of damage or malfunction. Preventative maintenance can help ensure the accuracy of the fuel gauge and reduce the risk of unexpected breakdowns due to inaccurate fuel readings.
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How to open a car's fuel cap
Opening a car's fuel cap can be confusing, especially when you're driving a car that isn't your own. Different manufacturers, and sometimes different models from the same manufacturer, can have different locations for the fuel-filler cap opener.
If you're driving a friend's car or a new car, opening the gas tank door can take some getting used to. Here are some general steps to follow:
- Turn off the car and unlock the doors. In most cars, the gas tank door won't open unless the car is turned off and the doors are unlocked.
- Check for a fuel tank lever or button near the driver's side door. The fuel tank opener is usually a small lever or button that releases the fuel-filler cover or cap.
- If there is no button or lever, push the gas tank door inward.
- If the gas tank door is stuck shut, you may need to engage the manual release lever through the trunk. Open the trunk and move the access panel near the fuel tank. If your car doesn't have an access panel, remove the cloth lining near the inside of the fuel tank.
- Reach inside the access panel until you touch a small box with a lever on the side. Press the lever downward to unlock the fuel tank door manually. You should hear a small click when you do this.
- If your car has a manual release pin instead of a lever, turn the pin counterclockwise, then pull it out.
Once you've opened the fuel tank door, you can begin the process of refuelling. After refuelling, remember to screw the gas cap back on and press the gas tank door shut. You'll hear a small "click" once the locking mechanism is engaged.
It's important to note that some cars have different mechanisms for opening the fuel tank. For example, some cars use levers, while others use buttons or the central locking mechanism. Additionally, if you're driving a Lotus, you may need to insert a key and twist it counterclockwise before loosening the cap.
Understanding the location and operation of your car's fuel lid opener is essential for convenience, safety, and a smooth fuel-filling procedure. It can save time, especially when you're at a busy fuel station, and prevent fumbling and frustration.
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The wrong fuel can damage your engine
Using the wrong fuel can indeed damage your engine. The issue arises from the fact that different types of engines are designed to run on specific types of fuel. For example, gasoline engines are designed to run on gasoline, which is typically identified as "regular" or "unleaded" at the pump. Diesel engines, on the other hand, are designed to run on diesel fuel, which is heavier and oilier.
Putting gasoline in a diesel engine can lead to severe problems. Gasoline doesn't have the lubricating properties of diesel fuel, so it can damage the fuel pump and injectors in a diesel engine. Additionally, gasoline won't ignite under the compression of a diesel engine, so it will just flood the cylinder and possibly hydrolock the engine, causing extensive damage.
Conversely, putting diesel fuel in a gasoline engine can also be detrimental. Diesel fuel is much more viscous and can clog up the fuel system, especially the injectors or fuel rail in modern fuel-injected engines. The engine may run very rough or not at all if the diesel fuel clogs the system.
Another issue is mixing fuel types. Some engines, such as flex-fuel vehicles, are designed to run on multiple types of fuel (usually gasoline and ethanol blends). However, other engines may not be compatible with these blends and could experience problems if the wrong type of fuel is used. For example, using E85 (a blend of 85% ethanol and 15% gasoline) in a non-flex-fuel vehicle can damage the fuel system and engine due to the higher ethanol content.
To avoid these issues, it's important to always use the correct type of fuel for your vehicle's engine. Double-check the pump before filling up, and if you do accidentally put the wrong fuel in, do not start the engine. Seek professional help to drain and flush the fuel system to prevent any potential damage to your vehicle.
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How much extra fuel to take on a flight
The amount of extra fuel carried on a flight depends on several factors, including the type of aircraft, the distance travelled, the number of passengers, weather conditions, and the price of fuel at different airports.
Firstly, the amount of fuel needed for a flight is calculated based on the aircraft's weight, the distance travelled, and expected weather conditions. For example, a Boeing 747 can carry up to 568 people and burns approximately 5 gallons of fuel per mile, resulting in a fuel efficiency of 100 miles per gallon per person. On the other hand, the Airbus A380, the world's largest jet airliner, burns 4,600 gallons of fuel per hour.
Secondly, the airline dispatch office prepares a flight plan that specifies the minimum fuel required for the trip, known as the "Block Fuel". This calculation is based on current wind and temperature data and is relatively accurate. However, pilots often carry extra fuel, especially when facing unfavourable weather conditions. This additional fuel is known as "contingency fuel", and a minimum of 5% of the total fuel must be allocated for this purpose.
Thirdly, airlines may engage in "fuel tankering," where they add more fuel than needed for the current flight to avoid paying higher fuel prices at the destination airport. This strategy is referred to as "economic fuel tankering." Additionally, in cases where fuel is unavailable or in short supply at the destination, a practice known as "operational fuel tankering" is employed.
Finally, the captain of the flight has the authority to carry more fuel than specified in the flight plan, especially if they anticipate potential hazards along the route.
In conclusion, while there are standard calculations and regulations in place to determine the minimum fuel requirements for a flight, various factors can influence the decision to carry extra fuel. These factors include the aircraft's weight, weather conditions, fuel pricing, and the captain's judgment. Ultimately, the safety of the flight and the ability to handle unexpected situations take precedence over fuel efficiency.
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