Sylvie Willis
Many car owners wish for a bigger fuel tank in their vehicle. A bigger tank increases the capacity of the car to store fuel, reducing the need to refuel at urgent times. However, a larger tank adds extra weight to the vehicle, creating more work for the car. There are several ways to increase the capacity of your tank, including altering your existing tank, adding a tank, or swapping your fuel tank for a larger one.
| Characteristics | Values |
|---|---|
| Can you put a bigger fuel tank in a car? | Yes, it is possible to put a bigger fuel tank in a car. |
| Reasons for wanting a bigger fuel tank | To increase the capacity of the car to store fuel so you may not need to refuel as often. |
| Methods to get a bigger fuel tank | 1. Enlarge the default tank by removing it, cutting it open, and grafting new material into it. 2. Air the tank to cause it to expand (provides less additional capacity). 3. Attach an auxiliary tank to the opposite side of the default tank. 4. Replace the default tank with a larger aftermarket fuel cell or a larger tank from the factory. |
| Considerations | Car design, budget, skills, weight, fuel efficiency, interior space, and potential problems/costs associated with installing an auxiliary tank. |
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What You'll Learn
Pros and cons of a bigger fuel tank
A bigger fuel tank can be beneficial for those who want to increase their car's range and reduce the frequency of refuelling. However, there are trade-offs to consider when opting for a larger fuel tank. Here are some pros and cons to help you make an informed decision:
Pros of a Bigger Fuel Tank:
- Increased Range: A larger fuel tank means your car can travel farther between refuelling stops. This can be especially useful for long-distance trips or if you frequently drive in areas without easy access to gas stations.
- Reduced Refuelling Frequency: With a bigger fuel tank, you won't need to refuel as often. This can save time and the hassle of having to stop for gas frequently, especially if you're always on the go.
- Better Fuel Efficiency in Certain Conditions: Some car owners have reported that their vehicles achieve better fuel efficiency with a bigger fuel tank, especially in colder climates or when driving in snow. The extra weight of a full tank can provide better traction and grip in slippery conditions.
Cons of a Bigger Fuel Tank:
- Weight Impact on Performance: The additional weight of a larger fuel tank and the fuel it carries can affect your car's performance. A heavier car may experience reduced acceleration, decreased fuel efficiency (especially in city driving), and increased wear and tear on certain components like suspension and brakes.
- Safety Concerns: Car manufacturers design fuel systems to strict regulatory standards to prevent fuel leaks and spills. Installing a larger fuel tank, especially an aftermarket option, may introduce safety hazards if not properly engineered and installed.
- Cost and Installation Complexity: Enlarging the factory tank or installing an auxiliary tank can be expensive and technically challenging. It may require modifications to the vehicle's structure and fuel system, potentially voiding warranties or causing issues with regulatory compliance.
- Space Constraints: A bigger fuel tank may occupy valuable space in your car, impacting cargo capacity or requiring modifications to the vehicle's design.
Ultimately, the decision to opt for a bigger fuel tank depends on your specific needs and driving habits. While a larger fuel tank can offer the convenience of extended range and reduced refuelling stops, it may come at the cost of performance, safety, and installation complexity. It's essential to carefully consider these factors and consult with automotive professionals before making any modifications to your vehicle's fuel system.
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How to increase a car's fuel capacity
There are several ways to increase a car's fuel capacity. One way is to enlarge the factory tank, but this may not always be possible or safe, especially if you are considering a significant increase in size. The OEM fuel systems are designed to strict regulatory standards to prevent fuel leaks and spills, so any modifications must be done carefully and in adherence to safety protocols.
Another option is to add an auxiliary tank or even multiple tanks. This is a more feasible option as it does not alter the original fuel system, but it will still require careful installation due to the flammable nature of gasoline. One example of this is the current Jeep models that offer a 50-gallon aftermarket option.
If you are unable or unwilling to make physical modifications to the fuel tank, there are other ways to increase your car's range and reduce the frequency of refueling. Firstly, you can improve the fuel efficiency of your car. Properly inflated tires can increase fuel efficiency, and removing roof racks or boxes can improve aerodynamics, reducing drag and fuel consumption. Additionally, maintaining the correct wheel alignment and using the appropriate fluids, components, and lubricants can also enhance fuel efficiency.
Reducing the weight of your car can also help. Heavy cargo increases the power your car needs to move, so removing unnecessary items from your trunk or roof can make a difference. Similarly, swapping heavy, fixed racks for sleek, retractable ones can reduce drag and save fuel.
Finally, driving habits can impact fuel efficiency. Respecting speed restrictions, avoiding excessive idling, and maintaining a steady speed can all help to optimize your car's fuel economy.
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Safety hazards of an external fuel tank
While it is possible to install an external fuel tank on a car, there are several safety hazards to consider. Firstly, gasoline is highly flammable and dangerous, and any leaks or spills pose a significant risk of fire or explosion. This risk is heightened in the event of a collision, where a fuel leak could lead to a catastrophic fire, causing injury or death.
To mitigate these risks, fuel systems are designed to strict regulatory standards, including measures to prevent fuel leaks and spills. Installing an external fuel tank may circumvent these safety features, increasing the risk of a fuel-related incident. Additionally, external fuel tanks may not have the same level of protection as the built-in fuel tank, making them more vulnerable to damage in an accident.
Another safety hazard of external fuel tanks is the potential for improper installation or maintenance. It is crucial to ensure that the tank is securely mounted and does not obstruct any vital components or safety features of the vehicle. Improper installation could lead to fuel leaks, electrical issues, or structural damage, compromising the safety of the vehicle and its occupants.
Furthermore, external fuel tanks require regular maintenance and safety checks. This includes inspecting the tank for any signs of damage or corrosion, ensuring that the fuel caps are tight and secure, and checking for any leaks or blockages in the fuel lines. Neglecting proper maintenance increases the risk of fuel leaks and potential fires, especially if the tank is not properly monitored and maintained over time.
Lastly, the presence of an external fuel tank may impact the stability and handling of the vehicle. The additional weight and placement of the tank could affect the car's centre of gravity, potentially compromising its balance and stability, especially during cornering or abrupt manoeuvres. This could increase the risk of accidents and compromise the overall safety of the vehicle.
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Cars with the option of a bigger tank
There are several options for increasing a car's fuel capacity. One way is to enlarge the factory tank, but this may not always be possible due to space constraints and potential safety hazards. Another option is to install an auxiliary tank, which can be placed externally if there is room, but this too comes with safety risks due to the flammable nature of gasoline.
Some car models do offer larger fuel tanks as an option, allowing buyers to choose a bigger tank during the purchasing process. The 2024 Ford Super Duty, for example, offers the largest gas tank on the market, providing extended range and fuel efficiency. The Super Duty has a couple of different powertrain options, and while some are more efficient than others, they are all quite fuel-intensive. The base model comes with a 6.8-liter V-8 engine, but this can be upgraded to a more powerful 7.3-liter V-8. The SuperCab version of this model offers a larger 34-gallon tank, while the Crew Cab model can be fitted with a 48-gallon tank.
The Porsche Panamera used to offer an optional 26-gallon tank, which is also available on the Porsche GT3, the only model in the 911 line with this option. The McLaren F1 has a 24-gallon tank, and the 2022 Mustang Shelby GT 500 is known to be a "gas guzzler," indicating a larger fuel tank. Current Jeep models also offer a 50-gallon tank option in the aftermarket, designed to look like an original feature.
While some cars offer larger tanks as an option, it is important to consider the trade-offs, such as increased weight, which may impact performance, especially in racing cars.
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Tips for boosting fuel efficiency
While it is possible to increase your car's fuel capacity by installing a bigger fuel tank, it is not recommended due to safety hazards. Instead, you can follow these tips to boost your vehicle's fuel efficiency and reduce your fuel consumption:
Maintain Optimal Tyre Pressure
Tyres with the recommended pressure reduce rolling resistance, improving fuel economy. Check your tyres every few weeks and inflate them to the recommended PSI. Properly inflated tyres also improve fuel efficiency by reducing friction and enhancing grip.
Accelerate and Decelerate Smoothly
Vehicles use the most fuel when accelerating and gaining speed. By limiting rapid acceleration and maintaining a steady speed, you can improve your fuel economy. When conditions allow, use cruise control to maintain a consistent speed and save fuel.
Drive at Optimal Speeds
Driving at high speeds, especially over 60 mph, significantly reduces fuel efficiency. Try to maintain a speed at or below the speed limit, and if possible, drive during off-peak hours to avoid rush-hour traffic, which causes frequent stops and starts.
Regular Servicing and Maintenance
Keep your vehicle well-maintained and serviced. This includes lubricating the engine and transmission, renewing air and oil filters, replacing spark plugs, and maintaining bearings and lubrication in moving parts of the chassis. A well-tuned engine will run more efficiently and use less fuel.
Reduce Weight and Drag
Remove any unnecessary items from your vehicle to reduce weight, which can impact fuel efficiency. Additionally, keep windows closed at higher speeds to minimise drag and improve aerodynamics, resulting in better fuel economy.
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Frequently asked questions
Yes, you can put a bigger fuel tank on a car. There are three ways to do this: altering your existing tank, adding a tank, or swapping your fuel tank for a larger one.
Enlarging the default tank is a difficult task and should only be done by a professional. It may involve removing the tank, cutting it open, and grafting new material into it. Alternatively, you can air up the tank, causing it to expand like a balloon, but this doesn't add much capacity.
You can install an auxiliary tank and set up a mechanism to transfer fuel from the auxiliary tank to the default tank when it's low. However, this can be expensive and may cause potential problems depending on your car design.
You can remove your existing tank and replace it with an aftermarket fuel cell. This may involve dropping your suspension, disconnecting shock absorbers, and fuel lines, and removing metal straps holding the tank in place.
Bigger fuel tanks add extra weight to the vehicle, which can create extra work for the engine. Additionally, enlarging the default tank may require giving up some interior space.
