Ameer Randolph
There is much debate about whether brake lines can be used as fuel lines. Some people have used steel brake lines for fuel lines without encountering any problems. The main difference between the two is the diameter of the line, with brake systems seeing much higher pressure than any fuel system. For example, a 5/16 or 3/8 brake line will work fine as a high-pressure fuel line. The material used for both is often the same, typically low carbon steel tubing, and the fittings are also the same. However, it is important to check the rule book for your sanctioning body to ensure that using a brake line as a fuel line is legal. Additionally, while aluminum tubing is convenient due to its easy bending, easy flaring, availability, and low cost, it may not be DOT-approved for fuel lines due to safety concerns.
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What You'll Learn
- Aluminium tubing is fine for fuel lines, but it may not be DOT-approved
- Steel brake lines can be used for fuel lines, but they may not be CG-approved
- The diameter of the line is important: 5/16 or 3/8 is recommended
- Brake systems have much higher pressure than fuel systems
- Running brake and fuel lines through the cabin is common in some cars
Aluminium tubing is fine for fuel lines, but it may not be DOT-approved
Aluminium tubing can be used for fuel lines, but it may not be approved by the Department of Transportation (DOT). Aluminium tubing is easy to bend by hand, making it convenient for plumbing hard fuel lines. It is also inexpensive and readily available. However, aluminium is softer than steel and has lower strength, which can be a problem if the lines are poorly routed or unprotected. There are also concerns about the safety of aluminium fuel lines, as they can be easily punctured by sharp objects.
Brake lines are made from low-carbon steel tubing, which is known for its strength and durability. Steel brake lines have a higher pressure rating than fuel lines, typically operating at 1000-2000 psi compared to 30-60 psi for fuel systems. This means that steel brake lines are more than strong enough to handle the pressure of fuel systems.
When choosing between aluminium and steel tubing for fuel lines, it's important to consider the specific requirements and regulations that apply. While aluminium tubing may be convenient and inexpensive, it may not meet the necessary safety standards or have the same strength and durability as steel tubing.
In the United States, the Coast Guard (CG) has specific regulations for fuel lines in small craft, requiring the use of steel or USCG-approved rubber hose for fuel delivery. Similarly, the Department of Transportation (DOT) may have approval requirements for fuel lines in vehicles. It is essential to check the applicable rules and regulations to ensure that any modifications or repairs made to fuel or brake lines are safe and compliant.
Overall, while aluminium tubing can be used for fuel lines in some cases, it is important to carefully consider the potential trade-offs between convenience, cost, and safety before making a decision.
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Steel brake lines can be used for fuel lines, but they may not be CG-approved
Steel brake lines can be used as fuel lines, as the two use the same material and fittings. The only difference is in the diameter of the line, with brake lines having a larger diameter than fuel lines. This is because brake systems have to withstand much higher pressure than fuel systems. For example, brake systems may have to withstand 1000-2000 psi, while fuel systems typically produce 30-60 psi.
However, while steel brake lines can physically be used as fuel lines, they may not meet the necessary safety standards or regulations. For example, in the United States, the Coast Guard (CG) has strict rules about what can be used for fuel delivery in small craft. While steel lines are permitted, they must be double-flared at the pump and carb and have the correct swage fittings. CG-approved products will have lettering on the product indicating their approval. Therefore, while steel brake lines can be used for fuel lines in a pinch, they may not meet CG standards and may not be safe for use in fuel delivery systems.
It is important to note that different applications have different requirements for fuel and brake lines. For example, in racing cars, sanctioning bodies will have specific rules about what types of lines are permitted and how they must be installed. Similarly, different car makes and models may have unique specifications for their fuel and brake lines. As such, it is always important to consult the relevant rulebook or manual before making any modifications to fuel or brake lines.
In summary, while steel brake lines can physically be used as fuel lines in some applications, they may not meet the necessary safety standards or regulations. It is important to consult the relevant authorities or experts before making any modifications to ensure the safety and legality of the vehicle.
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The diameter of the line is important: 5/16 or 3/8 is recommended
The diameter of the line is an important consideration when using brake lines for fuel lines. While brake lines can be used for fuel lines, the diameter must be appropriate to ensure optimal performance and safety.
A larger diameter is generally recommended for fuel lines, with 5/16 or 3/8 being the most commonly suggested sizes. These sizes are widely regarded as suitable for high-pressure fuel systems. For instance, a 5/16" fuel line is perfect for smaller outboards, while a 3/8" line is suitable for larger outboards.
Using a smaller diameter, such as 5/16", may result in fuel supply issues, especially for high-performance engines. On the other hand, a larger diameter like 3/8" can provide benefits such as unrestricted flow and room for future modifications or upgrades. It's worth noting that some sources suggest that 5/16" may be too small for certain applications, like EFI systems, and recommend using 3/8" instead.
It's important to consider the specific requirements of your engine and application. For example, if you have a 90 HP engine and a 3/8" hose that is too loose, switching to a 5/16" hose or using an adapter to step down the size can be a solution. Additionally, the connections must be tight to prevent air leaks, which can cause issues with the engine's performance.
In summary, while brake lines can work for fuel lines, choosing the appropriate diameter is crucial. The recommended sizes of 5/16 or 3/8 will likely provide the best performance, safety, and compatibility for your fuel system.
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Brake systems have much higher pressure than fuel systems
Brake systems and fuel systems are two very different mechanisms in a vehicle. While the former is a closed system, the latter is an open system. The pressure in a brake system is much higher than that in a fuel system. The braking system consists of friction brakes on all wheels and multiple brake circuits for safety.
Brake systems in vehicles typically operate at pressures ranging from 1000 to 2000 psi, which is significantly higher than the pressure in fuel systems, which generally produce only 30-60 psi. This difference in pressure is due to the distinct functions of the two systems and the corresponding design requirements.
Brake systems are designed to bring a vehicle to a stop or reduce its speed by applying friction to the wheels. This requires a significant amount of force, which is generated by the hydraulic pressure in the brake system. The high pressure ensures that the brake pads or shoes can firmly press against the rotating wheels, creating the necessary friction to slow them down or bring them to a complete stop.
On the other hand, fuel systems are designed to deliver fuel from the tank to the engine. This requires a much lower pressure compared to brake systems. The fuel system typically uses an electric fuel pump to draw fuel from the tank and deliver it through the fuel lines to the engine's fuel injectors. The pressure in the fuel system is carefully regulated to ensure that the engine receives the appropriate amount of fuel for proper combustion.
While it is possible to use brake lines for fuel lines, it is important to understand that they serve different purposes and operate at different pressure levels. Using a brake line as a fuel line may not provide the necessary flow rate or meet the specific requirements of the fuel system. Therefore, while brake lines can physically be used as fuel lines in certain situations, it is always recommended to use the appropriate type of line for each system to ensure optimal performance and safety.
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Running brake and fuel lines through the cabin is common in some cars
Running brake and fuel lines through the cabin is a common feature in some cars, especially in older models. For instance, Honda and BMW 2002s had fuel lines running through the cockpit, while 90s Subarus and Ford Fairmonts had fuel lines running through the cabin.
While it is possible to run these lines through the interior of the car, there are safety concerns to consider. For example, one source mentions that running a single piece solid line through the cabin is "nearly guaranteed death". Another source mentions that they would not want to deal with the "tech guys" even if the job is done to the rules.
If you are considering running brake and fuel lines through the cabin, it is important to follow regulations and take the necessary precautions to ensure safety. One suggestion is to use a large enough hard line from the rear firewall to the front firewall, allowing you to run flexible fuel/brake lines through the cabin while still enclosing them in a fireproof structure.
Additionally, when choosing the type of tubing to use, consider the material, diameter, and pressure requirements. Steel tubing, for example, is commonly used for both fuel and brake lines due to its strength and ease of bending and flaring. Aluminum tubing, on the other hand, is lightweight and easy to bend but may not be as strong as steel. It is important to ensure that the tubing can withstand the pressure requirements of the fuel and brake systems.
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Frequently asked questions
Yes, you can. The material used for brake lines is the same as that for fuel lines, and they have the same type of fittings. However, it will not be CG-approved.
The only difference between a fuel line and a brake line is the diameter of the line. Brake systems see much more pressure (1000-2000psi) than any fuel system (30-60psi).
Aluminium tubing is fine for fuel lines, and it is easy to bend by hand. The only pitfall is strength, which only comes into play if poorly routed and/or protected. Low carbon steel tubing is also used for fuel lines as it is easily formed and bent.
You should avoid running a fuel line inside an exhaust tunnel as heat is not good for them. For rallycross, there is no reason to have interior fuel lines.
