Rajan Wilcox
The size of a fuel line for alcohol is a highly debated topic, with many people suggesting that a larger diameter is better. However, it is important to note that using a fuel line with a larger diameter than needed can lead to unnecessary expenses and potential engine damage. When determining the appropriate fuel line size, it is crucial to consider factors such as horsepower requirements, pump capacity, and the type of alcohol being used as fuel. For example, ethanol requires 30% more fuel than gasoline to generate the same horsepower, while methanol requires double the amount. Additionally, the use of alcohol as a fuel may require modifications to the existing fuel system, such as replacing the fuel lines with new ones made from materials like stainless steel or Teflon.
Characteristics and Values of a Fuel Line for Alcohol:
| Characteristics | Values |
|---|---|
| Diameter | A larger diameter is generally better, but the correct diameter is the best choice. The diameter must be able to support horsepower goals. |
| Material | Stainless steel braided rubber hose, PTFE-lined (Teflon), or standard braided lines are suitable for alcohol fuel. |
| Colour | Blue or transparent |
| Flexibility | Flexible enough to fit over the line securely |
| PSI | Withstands 50 PSI |
| Tensile Strength | 8000 PSI |
| Rot and Deterioration | Resistant to rot and deterioration from the inside |
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What You'll Learn
Stainless steel braided rubber hose
When it comes to fuel lines for alcohol, specifically ethanol, there are a few things to consider in terms of sizing and material. Firstly, it is important to note that the standard size for fuel lines is often sufficient for most applications, and increasing the diameter is usually not necessary. For example, a 3/8" ID fuel line can support 600 HP with sufficient "pump head", and it can even support 1000 HP with a large enough pump.
Now, let's discuss the Stainless Steel Braided Rubber Hose as an option for an alcohol fuel line:
The Stainless Steel Braided Rubber Hose is a popular choice for fuel lines due to its durability and compatibility with various fuels, including alcohol. This type of hose typically consists of an inner rubber layer, often made of Nitrile Rubber (NBR), which is then braided with stainless steel wires. This construction provides several benefits, including heat and
One key advantage of using a stainless steel braided rubber hose for alcohol fuel lines is its compatibility with flexible fuels. The hose is designed to handle various fuel types, including E85, E10, methanol, and racing fuels. This makes it suitable for applications where the fuel mixture may vary or for vehicles that use ethanol-blended fuels. Additionally, the hose is approved for use in fuel systems, cooling systems, and vacuum applications, providing versatility in its use.
When choosing a stainless steel braided rubber hose for your alcohol fuel line, it is important to consider the temperature range and pressure ratings. High-quality hoses can operate within a wide temperature range, typically from 30°C to +100°C or even 40°F to 300°F. Additionally, the hose should be able to withstand high pressure, with some hoses capable of withstanding tensile strength up to 8000 PSI.
Finally, it is worth noting that stainless steel braided rubber hoses are available in various sizes and lengths. Standard sizes include AN -06, -08, and -10, and they are typically sold in pre-cut lengths ranging from 4 feet to 20 feet. However, some suppliers also offer custom lengths, allowing you to purchase the exact amount required for your specific application.
Fuel Line Sizing: What Diameter Matches?
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Fuel line sizing
Many factors come into play when determining the appropriate fuel line size. The type of fuel used, such as ethanol or methanol, influences the required diameter as these fuels need more volume than gasoline to generate the same horsepower. For example, ethanol requires 30% more fuel, while methanol requires double the amount.
The design of the fuel line system also matters. When dealing with fuels like ethanol or methanol, it is recommended to go one or two sizes larger than the gasoline requirement. The return lines, which are the fuel lines after the regulator, can typically be one size smaller than the feed line.
Additionally, the pump's capabilities should be considered. A bigger pump can support a larger horsepower even with a smaller-diameter fuel line. For instance, a 3/8" steel line can support 1000 HP with a big enough pump.
It is worth noting that most stainless steel braided rubber hoses are compatible with alcohol. However, over time, they may harden or seep if left empty. To address this, it is recommended to have a good alcohol filter before the carburetor when switching to alcohol.
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Alcohol-resistant fuel lines
When it comes to choosing a fuel line for alcohol, it's important to select one that can withstand the unique properties of this fuel type. Alcohol, including ethanol and methanol, has a lower surface tension compared to gasoline, which can affect how it flows through a fuel line. This is where alcohol-resistant fuel lines come into play.
The Bing Alcohol Resistant Fuel Line, in particular, offers several advantages. Firstly, it is highly flexible, making it easy to work with and secure over the fuel line. Secondly, it exhibits low permeability, which means less fuel vapour permeation when compared to conventional hoses. This fuel line can withstand up to 50 PSI of pressure and has a tensile strength of 8000 PSI, making it suitable for a range of applications.
When it comes to sizing, it's important to note that alcohol-resistant fuel lines are typically sold by the foot, and they are available in standard sizes such as 5/16" and 1/4". It is recommended to consult a qualified technician or refer to your specific aircraft parts manual to ensure you select the correct size for your application. Additionally, it's worth mentioning that the colour of the Bing fuel line is blue, which adds a unique touch to your setup.
In conclusion, when choosing a fuel line for alcohol, opting for an alcohol-resistant fuel line is essential. The Bing Alcohol Resistant Fuel Line, with its flexibility, durability, and compatibility, has proven to be a reliable choice for many users. By selecting the appropriate size and ensuring proper installation, you can have peace of mind knowing that your fuel system is equipped with a high-quality, alcohol-resistant fuel line.
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Fuel pump compatibility
When it comes to fuel pump compatibility with alcohol, there are a few things to consider. Firstly, it is important to choose a pump that is designed to handle the unique characteristics of alcohol as a fuel. Alcohol can be corrosive and may require a different pump material to prevent damage or contamination. Some pump materials, such as certain types of aluminium, may not be suitable for long-term use with alcohol. For example, Holley black fuel pumps are known to get full of gunk over time due to alcohol eating the aluminium.
Weldon Racing Pumps are a popular choice for those using alcohol fuel. All Weldon billet-bodied units are fully compatible with alcohol and can handle higher pressures for boosted or EFI applications. If you're working with a high-horsepower application, a mechanical fuel pump may be a better option, and Weldon also offers a couple of those. Another option mentioned in the forums is the Carter pumps, which work great with alcohol and are affordable, although they might not supply a lot of horsepower.
It is also essential to consider the size of the fuel line when using alcohol. The inner diameter of the fuel line should be sufficient to allow proper fuel flow without creating excessive pressure drop. While larger diameter fuel lines are sometimes used, a 3/8" ID fuel line is typically sufficient for most applications, even high-horsepower ones, given enough "pump head". Increasing the pump capacity can also help maintain adequate fuel flow if necessary.
Finally, it is worth noting that some fuel lines are specifically designed to be alcohol-resistant. The Bing Alcohol Resistant Fuel Line, for example, is blue in colour and resistant to rotting or deterioration from the inside, which could otherwise clog the carburetor or fuel system. It can withstand 50 PSI and has a tensile strength of 8000 PSI. It is also more flexible than other fuel lines, making it easier to work with.
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Fuel type and diameter
The diameter of a fuel line is important when considering the fuel type. A larger diameter is generally better, but choosing the correct diameter is key. If the diameter is too narrow, horsepower goals may not be met. If the diameter is too wide, the lines will take longer to pressurize, and if the pump cannot maintain the pressure, it can lead to engine damage.
For example, ethanol will require about 30% more fuel than gasoline to generate the same horsepower, and methanol will require double the amount of fuel. Therefore, a larger diameter is required for these fuel types. Many in-line fuel pump manufacturers recommend a fuel line diameter that works optimally with their pumps. This is to prevent starving the pump and is not necessarily related to the size of the outlet line.
When designing a fuel line system for ethanol or methanol, it is recommended to go one or two sizes larger than the gasoline requirement. The return lines, which are the fuel lines after the regulator, can generally be one size smaller than the feed line.
It is important to note that not all fuel lines are suitable for all fuel types. For example, when switching from race gas to alcohol, it is recommended to replace the lines with new ones, preferably PTFE-lined (Teflon) as they seem to hold up better, although they are more expensive. Standard braided lines will also work as long as they are rated for fuel. Additionally, if the fuel tank has foam in it, it should be removed as it will dissolve in alcohol.
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Frequently asked questions
The size of the fuel line depends on the horsepower requirements of your vehicle. A 3/8" diameter fuel line can support 600 HP with sufficient "pump head". A 1/2" diameter fuel line is not necessary for 600 HP but can be used.
A larger diameter fuel line will help you achieve your horsepower goal.
A larger diameter fuel line will take longer to pressurize, and if your pump cannot maintain the pressure, it can lead to engine damage.
Most stainless steel braided rubber hoses will work with alcohol. PTFE-lined (Teflon) hoses are preferred as they hold up better but are more expensive.
If your fuel tank has foam in it, be sure to remove it as it will dissolve in alcohol. Also, ensure you have a stainless steel fuel filter, not a paper one.
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