Rajan Wilcox
Fuel lines are an essential component of any vehicle, delivering fuel from the tank to the engine. The diameter of a fuel line impacts engine performance, with larger diameters generally being better, but the correct diameter is crucial. Metal fuel lines are common because they are more durable than soft materials, but their thickness can vary. This depends on factors such as the vehicle's engine, fuel type, and racing regulations. For example, NHRA rules limit rubber fuel lines to 12 and some racing classes restrict the use of rubber. The type of pump and fuel also influence the required thickness of metal fuel lines.
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What You'll Learn
Fuel line diameter: bigger isn't always better
While a larger fuel line diameter is generally better, choosing the correct diameter is the best option as bigger isn't always the best option for your fuel line. If the diameter is too small, you won't be able to support your horsepower goal. However, if the diameter is too big, the lines will take longer to pressurize. If your pump can't maintain the pressure, it can drop during times of high demand, leading to engine damage. It is also an unnecessary expense, as bigger is more expensive.
Many in-line fuel pump manufacturers recommend a fuel line diameter that works best with their pumps. This prevents starving the pump and is not necessarily the size of the outlet line. It is important to note that the return lines, which are the fuel lines after the regulator, can generally be one size smaller than the feed line.
The ideal size of the fuel line depends on factors such as the engine size, horsepower, and desired level of performance. It is best to consult with a professional or conduct thorough research to determine the appropriate size for your specific vehicle. Installing a larger fuel line is a complex task that should only be done by a trained and experienced mechanic. It requires specialized tools and knowledge to ensure proper installation and avoid potential safety hazards.
Additionally, using a larger fuel line may void the warranty on your vehicle, as it is considered a modification that could potentially impact the performance and longevity of the vehicle. It is crucial to check your warranty and consult with the manufacturer before making any modifications.
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![3/8" Aluminium Hard Fuel Line, 10FT 1060 Grade Aluminium Tubing for Brake Line, Metal Gas Line Steel Tubing, Refrigeration Equipment, [Wall Thickness:0.063"]](https://m.media-amazon.com/images/I/71FNW3pSXLL._AC_UY218_.jpg)
Metal lines are best but hard to fabricate
Metal fuel lines are the best option for your vehicle as they are highly durable and virtually non-corrosive. Stainless steel, for example, will outlast any other material. However, they are hard to fabricate due to the nature of the material.
Fabricating metal fuel lines requires a lot of precision and care. The line ends must be completely free of burrs and imperfections. When cutting the metal tubes, a hacksaw is preferred over a tubing cutter as the latter will work-harden stainless steel, making it tougher to get a proper flare. It is also very difficult to achieve a good double flare with stainless steel. This is because stainless steel is a much harder material than conventional galvanized steel. Extra care must be taken when bending it.
There are a variety of tools available for fabricating metal fuel lines, including bending and flaring tools. These tools are designed to fit many budgets. For instance, double-flaring tools are available for $12 to $22 from Harbor Freight Tools. However, it is generally recommended to opt for higher-priced, better-quality tools as they tend to provide better results.
When flaring metal fuel lines, it is important to use a lubricant at the flaring head and line end to ensure a smoother process. For fuel lines, a low-viscosity engine oil or WD-40 can be used as a lubricant. It is crucial to take your time and get the fabrication right to avoid issues like cockeyed and incomplete flares, which can lead to time-consuming corrections and leakage.
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Rubber hoses are easy to install but degrade quickly
The thickness of a metal fuel line depends on several factors, including the type of fuel, the horsepower goal, and the size of the outlet line. For example, ethanol requires 30% more fuel than gasoline to generate the same horsepower, so the fuel line would need to be larger in diameter.
When it comes to installing fuel lines, rubber hoses are a popular choice due to their flexibility and ease of installation. However, one of their main drawbacks is that they degrade quickly. Several factors contribute to the degradation of rubber hoses, including age, heat, and chemical reactions. The quality of the rubber itself also plays a significant role in its longevity.
To extend the lifespan of rubber hoses, proper maintenance is crucial. This includes regular inspections and replacements as needed. Additionally, the use of lubricants during assembly can make installation easier and help prevent leakage. However, it's important to choose the right type of lubricant, as some products, such as standard grease, can damage certain types of rubber. For example, EPDM rubber, commonly used in radiator hoses, performs well with hot water and antifreeze but should not be used with oil or grease.
To maintain the flexibility of rubber hoses, some people recommend using a protectant spray, such as 303 Protectant, which is known for its water resistance. This can be especially beneficial for older cars to prevent the rubber from drying out and cracking. It's also important to consider the environment in which the rubber hoses will be used, as exposure to sun, seasonal changes, and coiling and uncoiling can also impact their durability.
In summary, while rubber hoses offer convenience and flexibility, they require careful maintenance and may need to be replaced more frequently than other options. By choosing the right type of rubber, avoiding harmful lubricants, and using protectants, it may be possible to extend the lifespan of rubber hoses and prevent premature degradation.
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Nylon tubing is a good budget option
The diameter of a fuel line is crucial. If the diameter is too small, you won't be able to support your horsepower goal. If it's too big, the lines will take longer to pressurize, and if your pump can't maintain the pressure, it can lead to engine damage. Nylon tubing is a good budget option for fuel lines. Dorman's 800-072 25 Ft. Of 3/8 In. Nylon Fuel Line, for example, is a flexible line tubing that is perfect for replacing metal fuel lines. It is important to ensure that the connections are tight and secure. Additionally, it bends and collapses easily, so it is recommended to keep it as straight as possible.
Nylon tubing is a cost-effective choice for those looking to save money. It is possible to plumb your entire system for under $100 with new OEM lines. Dorman, a trusted brand with a diverse collection of fuel line repair solutions, offers packs of 5 fittings for $12.99 or 2 for $6.99.
When working with nylon tubing, it is important to have the right tools. Traditionally, the Dorman Nylon compression tool is used, but this can be expensive. However, there are alternative methods to achieve the same results without breaking the bank. One such method involves using a roll of tubing (such as Dorman 800-072), appropriate fittings, a light lubricant, a line clamp from a brake line flaring kit, a caulking gun, and a single-edge razor blade or tubing cutter.
By following the steps outlined in the NastyZ28.com forum, it is possible to successfully work with nylon tubing without incurring high tool costs. This makes nylon tubing an even more attractive option for those looking for a budget-friendly solution for their fuel line needs.
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Braided hoses are more durable but less flexible
Braided hoses are a popular choice for fuel lines due to their durability and performance. They are designed to withstand high pressure and extreme conditions, making them ideal for automotive and industrial applications. Braided hoses, particularly those made of stainless steel, are highly durable and can withstand harsh conditions, including extreme temperatures, chemicals, and abrasion. They are also less likely to kink or collapse under pressure.
However, one of the trade-offs of braided hoses is that they are less flexible than other options, such as rubber or nylon hoses. The presence of metal braiding increases their durability but makes them less pliable, which can be a challenge during installation, especially in tight bends or when contorting the hose into unorthodox positions. Stainless steel braided hoses are heavier than other materials, which can also impact their flexibility and ease of handling.
In contrast, rubber hoses offer greater flexibility, making them easier to route through difficult or confined spaces. They are also more resistant to vibration when the appropriate fittings are used. However, rubber hoses generally have a shorter lifespan and may need to be replaced more frequently than braided hoses. They are also less capable of withstanding external forces and pressure compared to braided lines.
Nylon braided hoses offer a balance between durability and flexibility. They are known for their strength and flexibility, making installation and handling easier. Nylon hoses are also lighter in weight, which further enhances their flexibility and ease of use. However, nylon braided hoses may not be as durable as stainless steel braided hoses, particularly in terms of abrasion, chemical, and extreme temperature resistance.
Overall, while braided hoses excel in durability and performance, they are less flexible than alternative options. The choice between braided and non-braided hoses depends on the specific requirements of the application, considering factors such as flexibility, durability, pressure, temperature, and ease of installation.
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Frequently asked questions
The thickness of a metal fuel line, also known as its diameter, matters a lot. If the diameter is too small, you won't be able to support your horsepower goal. If it's too big, the lines will take longer to pressurize, which can lead to engine damage if your pump can't maintain the pressure. Many in-line fuel pump manufacturers recommend a fuel line diameter that works optimally with their pumps.
The type of fuel you use can determine the thickness of your metal fuel line. For example, when designing a fuel line system for ethanol or methanol, it is recommended to go one to two sizes larger than the gasoline requirement as they require more fuel to generate the same horsepower.
Standard thicknesses for metal fuel lines include 1/8", 1/4", and 3/8". 3/8" is considered a "plenty big" size for a close-to-stock application.
