
Upgrading your fuel tank can be a great way to improve your vehicle's performance and efficiency. Whether you're looking for a larger fuel capacity for longer trips or wanting to enhance your engine's power, a fuel tank upgrade can be a worthwhile modification. This process can involve replacing your current fuel tank with a larger one, such as upgrading to a 47-gallon tank from a 30-gallon factory option, or even opting for fuel cells as an alternative. It's important to consider the demands of your vehicle's engine and any necessary adjustments to fuel pressure or delivery systems. Before installation, inspecting and ensuring the cleanliness of your new tank is crucial to avoid any issues down the road. Upgrading your fuel tank can provide benefits such as increased range and improved fuel efficiency, making it a popular choice for many car enthusiasts.
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What You'll Learn

Upgrading fuel tanks on normal cars
Upgrading the fuel tank of a car is a complex process and should be done with caution. It is important to note that I am unable to provide a comprehensive guide for upgrading fuel tanks on all car models. However, here are some general guidelines and considerations to keep in mind when upgrading the fuel tank of a normal car:
Firstly, it is essential to determine the type of fuel tank your car currently has and the available options for upgrading it. Some cars may have specific fuel tank designs or restrictions that limit the possibilities for upgrading. It is also crucial to consider the legal implications, as modifying a fuel tank may violate certain regulations or void warranties. Always check with local laws and consult a professional before proceeding.
The process of upgrading a fuel tank typically involves removing the old tank and installing a new, larger one. This requires careful planning and a good understanding of the car's fuel system. It is recommended to consult a mechanic or a specialist who has experience with fuel tank upgrades to ensure the work is done safely and correctly.
When choosing a replacement fuel tank, consider the capacity and shape that will best suit your needs. Larger fuel tanks can increase the car's range, but they may also impact the vehicle's weight and performance. Additionally, ensure that the new fuel tank is compatible with your car's fuel type and that all necessary fittings and components are available for a secure installation.
The installation process will vary depending on the car model and the fuel tank design. It typically involves disconnecting the old tank from the fuel lines, electrical connections, and any other associated components. The new tank will then need to be fitted securely, ensuring all connections are properly sealed to prevent leaks.
Upgrading a fuel tank can be a complex and technical process, and it is important to prioritize safety at all times. Always refer to manufacturer guidelines, seek professional advice, and have any work carried out by qualified individuals to ensure compliance with safety standards and legal requirements.
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EFI-ready fuel tank kits
Tanks Inc. and Holley Sniper offer a range of EFI-ready fuel tank kits that are perfect for pro-touring, autocross, or road racing rides. These kits are manufactured from galvanized steel with a silver powdercoat finish, giving them an OE tank look when installed. The fuel pump and sending unit are recessed in the tank, making installation a breeze and requiring no modifications to your car. With pre-drilled holes for the pump and baffling suited for electric fuel pumps, these kits are truly ready-to-go.
Tanks Inc. offers a variety of EFI-ready fuel tank kits in different gallon sizes, ranging from 16 to 24 gallons. These kits are compatible with a range of vehicles, including Chevrolet, GMC, Dodge, Plymouth, Ford, and Mercury. Each kit typically includes the fuel pump, sending unit, and straps, providing you with all the necessary components for a successful upgrade.
Additionally, EFI-ready fuel tank kits can also be found for late-model Pontiacs, ensuring compatibility across a wide range of vehicles. These kits are E85 compatible, but it's important to note that you must source your own Viton gasket as the supplied gaskets are not suitable for E85.
Upgrading to an EFI-ready fuel tank kit offers a cost-effective solution, especially when compared to inline fuel pump setups. Not only will you have a brand-new fuel tank, but you'll also benefit from a new sender that is likely maintenance-free for the duration of your ownership. So, if you're considering an EFI upgrade, investing in a dedicated fuel tank system is a wise choice.
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Inspecting and cleaning fuel tanks
Inspecting and cleaning your fuel tank is essential for maintaining your vehicle and ensuring optimal performance. Here are the steps you should follow:
Inspection:
Before cleaning your fuel tank, it is crucial to inspect it for any signs of contamination, damage, or corrosion. Use a flashlight to look inside the tank and pay attention to any rust spots, sludge, water, or defects in the material. Regular visual inspections can help identify issues early on and prevent costly repairs down the line. If you notice any unusual noises, such as knocking or whining, it may indicate the presence of contaminants, and it's time to inspect and clean your fuel tank.
Cleaning:
- Drain the Tank: Before cleaning, remove the fuel tank from the vehicle if possible. Drain all the fuel from the tank using an approved container or a fuel caddy. If there is still liquid remaining, use a suction device or turn the tank upside down to remove the remaining fuel.
- Rinse and Clean: Insert a hose into the tank and pour a stream of clean, hot water. Spray a mild detergent or a detergent-based fuel additive into the tank while filling it with water. If possible, use a brush to loosen debris from the sides of the tank.
- Remove Contaminants: Stop the stream of water and swish the water around to capture all debris. Dump the contaminated water into a pan, ensuring you capture any liquids. Wipe the tank with a lint-free washcloth to remove any remaining residue.
- Dry the Tank: Dry the fuel tank completely using compressed air. Ensure that the tank is thoroughly dry, both inside and outside, to prevent moisture from contaminating the fuel.
- Inspect and Repair: After the tank is dry, inspect it for any signs of rust or physical damage. If there is rust or damage, the tank may need to be repaired or replaced. You can use a sealant to seal pinholes and prevent rust. Add fuel line antifreeze/water remover to absorb any residual moisture.
- Reinstall the Tank: Once the tank is clean and dry, reinstall it securely, ensuring all valves, caps, and hoses are properly fitted.
It is important to note that fuel tank cleaning can be a dangerous task due to the combustible nature of fuel. Always exercise caution and refer to your vehicle's service manual for specific instructions.
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Replacing factory tanks with larger ones
Replacing a fuel tank is a big job and should not be taken lightly. The fuel tank is an important piece of equipment, and there are several things to consider when replacing factory tanks with larger ones. Firstly, it is important to note that fuel is highly flammable, especially petrol, and there is a degree of danger involved in dealing with fuel tanks. Therefore, the job should be done in a well-ventilated area to avoid inhaling fumes, which can be dangerous. It is also crucial to have a fire extinguisher nearby in case of any errant sparks.
Secondly, there will be a lot of parts to remove and work around when replacing the fuel tank. This includes dropping the suspension, removing the driveshaft, unclipping fuel lines, and dealing with numerous nuts and bolts. It is recommended to bag the nuts and bolts and label them accordingly, as well as take pictures before removing any parts, to ensure proper reassembly.
When upgrading to a larger fuel tank, it is important to consider the capacity and range you desire. For example, a truck owner with a factory fuel tank of 24 gallons, who gets 8 to 11 miles per gallon, may opt for a 54-gallon upgrade to increase their range from 200 miles to 400 or more. Similarly, another truck owner with a stock tank of 36 gallons may choose to upgrade to a 56-gallon tank, increasing their range from 500 miles to potentially double that.
It is also worth noting that some companies offer replacement fuel tank systems, such as Transfer Flow, which provides high-capacity replacement fuel tanks made from aluminized steel for superior durability. These tanks are designed to reduce fuel sloshing during acceleration, braking, and cornering, resulting in a safer and more stable driving experience. The cost of replacing a fuel tank can vary, with prices ranging from $565 to $1,200 for the tank itself, and the average installation cost falling between $1,561 and $1,776.
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Using fuel cells to extend fuel capacity
Upgrading your fuel tank can be a costly affair, with prices ranging from $1,561 to $1,776 on average. If you're looking to extend your fuel capacity, one option to consider is using fuel cells.
Fuel cells are an innovative technology that can provide a continuous source of electricity and heat as long as they are supplied with fuel, such as hydrogen. They work similarly to batteries but do not need recharging, making them an efficient and sustainable solution. The basic principle behind fuel cells is that they convert the chemical energy of hydrogen and other fuels into electricity through a pair of redox reactions. This process only produces electricity, water, and heat, making it a clean and environmentally friendly option.
There are different types of fuel cells available, each with its own advantages and applications. For example, polymer electrolyte membrane (PEM) fuel cells, also known as proton exchange membrane fuel cells, are ideal for powering automobiles due to their ability to quickly vary output to meet shifting power demands. On the other hand, direct-methanol fuel cells (DMFCs) are well-suited for portable electronic devices as they use methanol directly on the anode, eliminating the need for a fuel reformer.
The versatility of fuel cells is one of their greatest strengths. They can be used in a wide range of applications, from transportation to industrial, commercial, and residential buildings. Additionally, they can provide power for systems as large as a utility power station or as small as a laptop computer.
While fuel cells offer numerous benefits, there are still some challenges to their widespread adoption. Cost, performance, and durability are key factors that the fuel cell industry is working to improve. However, with continued research and development, fuel cells may become an even more viable option for extending fuel capacity in the future.
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Frequently asked questions
On average, it costs between $1,561 and $1,776 to replace a fuel tank.
You should change the fuel filter, pump the fuel out of the tank, change the filter again, and add fresh gasoline.
When the EVAP system is checked, the purge valve and vent valve are closed, and the technician monitors the pressure using a fuel tank pressure sensor. If the pressure drops with both valves closed, there is a leak in the EVAP system.
Yes, fuel tanks can be relocated. However, it is important to ensure that any modifications are done safely and in compliance with local regulations.
When upgrading to a larger fuel tank on a motorcycle, such as a five-gallon tank, it is important to consider the potential impact on the bike's range, handling, and aesthetics. Additionally, you may need to modify other components, such as the fuel pump or ignition, to accommodate the larger tank.











































