Rajan Wilcox
Braided PTFE fuel lines are becoming increasingly popular among car owners and auto techs. This is due to their durability and resistance to corrosion from oxygenated pump fuel. While aluminium fuel lines are a cheaper option, they are not recommended for EFI use, as they cannot withstand high pressure. Braided PTFE fuel lines, on the other hand, are ideal for street and racing applications where E85, gasoline or methanol-compatible fuel lines are required. They provide outstanding flow capacity and extended service life, as they do not harden, micro-fracture or permeate fuel vapour. In this paragraph, we will explore the benefits of switching from aluminium fuel lines to braided PTFE fuel lines and provide a step-by-step guide on how to make the transition.
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What You'll Learn
- PTFE fuel lines are more durable and prevent fuel vapour seeping through
- Braided lines are more flexible and can be used in tight spaces
- PTFE lines are more expensive but have a longer lifespan
- PTFE fittings must be installed correctly to prevent leaks
- PTFE lines are not suitable for emission-controlled vehicles
PTFE fuel lines are more durable and prevent fuel vapour seeping through
PTFE fuel lines are a popular choice for automotive enthusiasts, offering enhanced performance, durability and safety. One of the key advantages of PTFE fuel lines is their ability to prevent fuel vapour seepage, which can be a concern with other types of fuel lines.
PTFE, or polytetrafluoroethylene, is a material that is highly resistant to temperature extremes, chemicals, and ethanol-blended fuels. This makes it an ideal choice for fuel lines, as it can withstand extreme conditions and high temperatures often present in automotive applications. Additionally, PTFE fuel lines are designed to be compatible with various fuels, including E85, gasoline, and methanol.
One of the most significant benefits of PTFE fuel lines is their ability to prevent fuel vapour seepage. Unlike rubber hoses, which can allow fuel vapours to permeate through their walls over time, PTFE fuel lines are designed to be impermeable. This not only minimises fuel smells in the vehicle storage area but also helps to maintain a safe environment by reducing the risk of hazardous situations caused by fuel vapour accumulation.
The durability of PTFE fuel lines is another key advantage. PTFE fuel lines are constructed with a triple-layer material, featuring an innermost layer of PTFE for maximum chemical resistance, a braided stainless steel layer for strength and durability, and an outer nylon layer for added abrasion resistance. This construction makes PTFE fuel lines highly resistant to impact and abrasion, and kinking, ensuring a long service life.
While PTFE fuel lines offer superior performance and durability, it is important to note that they are more expensive than metal lines. Additionally, professional installation and the use of quality fittings are recommended to safeguard against leaks and ensure system integrity. However, with proper installation and maintenance, PTFE fuel lines can provide a robust return on investment by enhancing fuel system reliability and efficiency.
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Braided lines are more flexible and can be used in tight spaces
Braided lines are a popular choice for fuel lines in cars, especially in racing applications. They are made of PTFE, a material that is flexible and resistant to fuel vapour seepage. Braided lines are thinner and more flexible than traditional metal or rubber fuel lines, making them ideal for tight spaces and complex routing. Their flexibility also makes them easier to install, as they can be bent and manoeuvred through confined areas without the need for intricate bending or kinking. This is particularly advantageous when compared to the challenges of installing rigid metal lines, which can be difficult to manoeuvre and may require multiple segments to navigate tight spaces.
The flexibility of braided lines also extends to their application in brake lines. Braided brake lines offer improved brake feel and response compared to rubber lines, which can feel "mushy". This enhanced feedback can lead to better braking performance, especially in race cars or high-performance vehicles. The flexibility of the braided lines allows for more precise braking control, making it easier for drivers to modulate brake pressure and threshold brake effectively.
In addition to their flexibility, braided lines offer other benefits. They are resistant to impact and abrasion, providing protection for the inner PTFE liner. This durability enhances their safety, as braided lines can withstand hard abuse without ripping or rupturing easily. Furthermore, braided lines do not harden, micro-fracture, or permeate fuel vapour like normal rubber lines, minimising fuel smell in the vehicle storage area.
While braided lines offer superior flexibility and performance, there are some considerations to keep in mind. Braided lines are typically more expensive than metal lines, and they may require replacement due to wear and tear over time. Additionally, the PTFE liner in a braided line can be susceptible to damage from grit or other debris, which can compromise the integrity of the line. Nevertheless, braided lines remain a popular choice for car enthusiasts and racers due to their flexibility, performance, and durability advantages.
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PTFE lines are more expensive but have a longer lifespan
PTFE lines are more expensive than metal lines, but they offer a longer lifespan. PTFE, or polytetrafluoroethylene, is a high-quality woven fibreglass membrane coated in Teflon. It is an ideal material for fuel lines as it is extremely durable, weather-resistant, fire-resistant, and UV-resistant. It can withstand temperatures ranging from -73°C to 232°C, making it suitable for a variety of applications.
One of the key advantages of PTFE lines is their ability to prevent fuel vapour seepage. Unlike traditional rubber hoses, PTFE lines do not allow fuel vapours to escape, minimising the fuel smell in the vehicle storage area. This feature is especially important for racing applications, where fuel vapour seepage can be a safety concern.
PTFE lines also provide outstanding flow capacity and are easier to route in tight spaces due to their smaller outer diameter. They are less prone to kinking and can be bent without causing damage or ruptures. However, it is important to note that PTFE lines require careful installation, as any metal shards inside the hose can be potentially fatal for the engine.
In terms of maintenance, PTFE lines offer extended service life as they do not harden, micro-fracture, or permeate fuel vapour like normal rubber braided lines. This results in reduced fuel odour and a lower risk of fuel leaks. The lifespan of PTFE lines is further extended by their ability to withstand abrasion and impact, thanks to the protective stainless steel outer braid.
While PTFE lines come with a higher upfront cost, their longer lifespan and superior performance make them a worthwhile investment, especially in applications where fuel compatibility, durability, and safety are critical factors.
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PTFE fittings must be installed correctly to prevent leaks
To ensure a proper installation, it is important to follow the correct procedures and use the right tools. Before installing PTFE fittings, it is crucial to measure and mark the cut positions on the PTFE hose. This can be done by wrapping masking tape around the hose and marking the exact cut line. The hose should then be secured in a vice, with an overlap of around 10-20mm, and cut using a disc cutter or a saw blade. It is important to ensure that there are no metal shards inside the PTFE hose after cutting, as they can pose a serious risk to the engine.
The next step is to install the PTFE hose fitting socket nut. The hose should be checked to ensure it is round, and any burrs or frayed stainless-steel braids should be cleaned or trimmed. The socket nut should be placed onto the PTFE hose, and the stainless-steel braid should be gently expanded using a small screwdriver or pick. It is important to be careful during this step to avoid damaging the PTFE hose.
When installing the fitting, it is crucial to ensure that it is seated correctly in the vice with a slight overlap to prevent damage to the fitting or the spanner. The fitting should be tightened into the socket nut using the correct size spanner, and oil should be applied to the thread during this process. The fitting should be tightened until there is a gap of approximately 1mm between the fitting and the socket nut.
Finally, it is important to note that the olive, or aluminium insert, plays a crucial role in sealing the line. The olive should be placed over the PTFE inner liner, ensuring it goes all the way to the collar of the olive. The hose end socket can then be threaded onto the hose end, and lubricant can be applied to facilitate this process. It is important not to overtighten the hose end socket to avoid damage.
By following these steps and ensuring a correct installation, leaks can be prevented, and the benefits of PTFE fuel lines can be fully realized.
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PTFE lines are not suitable for emission-controlled vehicles
PTFE, or polytetrafluoroethylene, is a synthetic fluoropolymer with numerous applications due to its chemical inertness and non-reactivity. PTFE is often used as the liner in hose assemblies, expansion joints, and industrial pipelines, particularly when dealing with corrosive chemicals. In the context of vehicles, PTFE is commonly used in fuel lines, providing excellent flow capacity and extended service life.
However, when considering PTFE fuel lines in emission-controlled vehicles, it is important to note legal restrictions. PTFE fuel lines, such as those offered by Aeromotive, are not legal for sale or use on emission-controlled vehicles, except when used as a direct replacement part matching OEM specifications. This restriction is in place likely due to the potential environmental impact of PTFE. While PTFE is chemically inert, it is possible that its use in fuel lines could contribute to emissions of harmful substances, particularly if the PTFE liner is compromised.
The environmental impact of PTFE is evident in the case of Chemours, where the company was sued for violations of the Clean Water Act and the Toxic Substances Control Act due to the release of PFAS, including GenX, as a byproduct of production. As a result, Chemours was required to cease wastewater discharge, air emissions, and groundwater discharge, among other measures, to mitigate the environmental impact of their operations.
Furthermore, PTFE fuel lines may not be suitable for emission-controlled vehicles due to potential safety hazards. While PTFE is known for its low coefficient of friction, making it ideal for fuel lines, it is important to consider the potential for static charge buildup in unlined hoses. This static charge can arc through the hose wall, potentially leading to dangerous sparks near a fuel source. While conductive PTFE hoses can mitigate this issue, it is crucial to follow safety regulations and consider alternative options for emission-controlled vehicles.
In summary, PTFE lines may not be suitable for emission-controlled vehicles due to legal restrictions, environmental concerns, and potential safety hazards. While PTFE offers advantages in fuel line applications, it is essential to prioritize compliance with regulations and ensure the safety and environmental sustainability of the vehicle.
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Frequently asked questions
PTFE stands for polytetrafluoroethylene. It is a type of braided hose that is more durable than other hoses, such as rubber.
PTFE braided hose is more durable and provides better resistance to corrosion from oxygenated pump fuel. It also has better impact and abrasion resistance.
PTFE braided hose can be more expensive than other options. It may also not be legal for sale or use on emission-controlled vehicles, except when used as a direct replacement part.
PTFE braided hose is available in standard sizes including AN -06, -08, -10 and AN-12, and comes in pre-cut lengths (from 4-ft, 8-ft, 12-ft up to 16-ft).
PTFE braided hose can be purchased from automotive stores or online retailers. Some brands that sell PTFE braided hose include Fragola, Breeze, and Aeromotive.
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