Katerina Swanson
PTFE, or Teflon, is a popular alternative to rubber fuel hoses. Offering a longer lifespan, a wider working temperature range, and safe usage with all fuel types, PTFE hoses are a great upgrade for your vehicle. In this article, we will discuss the benefits of PTFE fuel lines and provide a step-by-step guide on how to install them, covering everything from cutting the hose to securing the fittings. We will also explore some of the challenges and considerations to keep in mind when making the switch to PTFE fuel lines.
Characteristics and Values of PTFE Fuel Lines
| Characteristics | Values |
|---|---|
| Hose Material | PolyTetraFluoroEthylene (PTFE), also known as Teflon |
| Hose Properties | Longer lifespan, wider working temperature range, safe for all fuel types, eliminates fuel smell |
| Hose Fittings | Aluminum or stainless steel, unique AN fittings developed by TechAFX |
| Hose Assembly | Requires basic tools, heat shrink tubing, grease or lubricant, and careful relief of fuel system pressure |
| Hose Cutting | Use specialty hose cutting shears, mark cut position with masking tape, cut square without forcing |
| Hose Connection | Mount hose end into fuel hose, prevent liner deformation, ensure full connection, do not overtighten |
| Hose Sealing | Use aluminum olive insert, brass ferrule, or crush conventional clamp to create a secure seal |
| Hose Compatibility | Suitable for all vehicles, including Ford, Dodge/Ram, Chevy Trailblazer SS, and import trucks |
| Hose Provider | Speedflow, Nuke Performance, Hot Rod Fuel Hose, and others offer PTFE hoses and fittings |
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What You'll Learn
Benefits of PTFE fuel lines
PTFE fuel lines offer a wide range of benefits over rubber fuel lines. PTFE, or Polytetrafluoroethylene, is the same chemical compound as Teflon, a DuPont trademark. PTFE fuel lines are more expensive than rubber alternatives, but they offer greater longevity, durability, and performance.
PTFE is highly resistant to ethanol-based fuels and does not degrade over time like rubber. This makes it an excellent choice for vehicles that use E85 fuels. PTFE is also resistant to a wide range of chemicals, including transmission fluid, brake fluid, power steering fluid, and antifreeze. This resistance to chemicals and ethanol-blended fuels ensures that PTFE fuel lines do not suffer from the same issues as rubber, which can deteriorate and cause leaks.
PTFE fuel lines can also withstand a wide range of temperatures, making them perfect for high-performance situations and modified vehicles. The high-temperature tolerance of PTFE ensures that the fuel lines are reliable and safe. Additionally, PTFE fuel lines typically have higher pressure ratings than rubber alternatives, making them ideal for high-stress situations.
The solid structure of PTFE blocks gasoline vapors, preventing fuel from escaping through the lines. This vapor barrier keeps garages and workshops free from unpleasant odors, maintaining a clean space. PTFE fuel lines are also available in multiple sizes and fittings, ensuring versatility and flexibility during installation.
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Cutting the PTFE hose
- Prepare the necessary tools: Before cutting the PTFE hose, gather the required tools, including a sharp blade or hose-cutting shears, plastic vice jaws, a small screwdriver or pick, and a flat metal tool if needed.
- Mark the cut position: Wrap a piece of masking tape around the hose at the desired cut location. This will help guide your cut and ensure a straight and precise line.
- Secure the hose: Place the hose in the plastic vice jaws to hold it securely in place. This will provide a stable base for cutting and prevent any unwanted movement.
- Cut with care: Using your chosen cutting tool, carefully cut through the hose. Let the blade do the work and avoid forcing it to ensure a clean and straight cut. Remember that cutting PTFE hose is similar to cutting a rubber hose.
- Clean and inspect: Once cut, clean away any burrs or debris from the cut ends of the PTFE tube. Use snips to trim any frayed stainless steel braids if necessary. Gently squeeze the hose with pliers to ensure it maintains its round shape.
- Prepare the fittings: As you prepare to install the fittings, ensure that the PTFE liner is not deformed. Use a flat metal tool to slightly widen the stainless steel braiding if needed to create space for the olive insert.
- Lubricate: Apply lubricant to the inside of the socket and the fittings to minimize friction and make the assembly process smoother.
- Install the olive insert: Push the aluminum olive insert onto the end of the PTFE tube, ensuring it covers the PTFE inner liner fully. Make sure no braid is caught between the tube and the olive to prevent leaks.
Remember to work carefully and follow the specific instructions provided by the manufacturer for your PTFE fuel line and fittings.
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$99.99
Fitting the PTFE hose
First, prepare the necessary tools and materials, including vice jaws, a saw blade, a small screwdriver, pliers, a scissor or nipper, aluminium olive insert, lubricant, and the PTFE fuel hose itself. It is recommended to use specialty hose-cutting shears and tools specifically designed for installing fittings to make the job easier.
Next, secure the PTFE hose in the vice jaws and mark the cut position by wrapping a piece of masking tape around the hose. Cut the hose squarely, allowing the saw blade to do the cutting without forcing it. Clean away any burrs or frayed stainless steel braids from the cut end of the PTFE tube. Ensure that the hose is round by gently squeezing it with pliers.
Now, you can start assembling the hose end and fitting. Begin by putting the aluminium hose end socket onto the PTFE fuel hose, securing the fuel hose braiding, and adding grease or lubricant to the inside of the socket for smooth installation. Locate the aluminium olive insert and position it so that it covers the PTFE inner liner and extends to the collar of the olive. Use a flat metal tool to gently widen the stainless steel braiding if needed to accommodate the olive insert.
Mount the hose end into the fuel hose, ensuring that the PTFE liner does not deform during this process. Apply lubricant to the fitting to facilitate the operation. Ensure that the aluminium olive face aligns with the collar of the hose end body. The mounted hose-end socket can then be threaded back onto the hose end, and you can tighten it, being careful not to overtighten.
Finally, complete the installation by inserting the PTFE hose fitting into the PTFE hose. Hold the hose and push the hose end nipple into the tube with a twisting and pushing action simultaneously. Check that it is fully inserted, and then engage the socket and PTFE hose fitting thread while keeping the assembly square.
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Tools required for installation
To install a PTFE fuel line, you will need a range of tools to ensure a smooth and efficient process. Here is a detailed list of the tools required for the installation:
Firstly, you will need tools to cut and assemble the PTFE fuel line. A fine-tooth metal saw is commonly used to cut the hose, and most people assembling hoses will have one readily available. Alternatively, you can use hose shears or commercial hose-cutting equipment. If you opt for shears, ensure they are specifically designed for PTFE hoses, as they effortlessly cut through both the nylon and stainless steel outer braiding.
Once you have made a clean cut, you will need to install the PTFE hose fittings. For this step, you will require a small screwdriver or pick to gently expand the stainless steel braid away from the PTFE tube. Work carefully around the tube to avoid any damage to the hose. You will also need a pair of snips to trim any frayed stainless steel braids. Additionally, a flat metal tool may be needed to widen the stainless steel braiding if there is no room for the olive insert.
To secure the fittings, an adjustable aluminium wrench is essential. It ensures a tight hold on the fittings, preventing any marring of the anodized aluminium surface. Aluminium vice jaws with a magnetic back are also useful to hold the fittings in place while placing the nut onto the hose.
Lubrication is crucial during the installation process. Therefore, having light oil or grease to lubricate the PTFE tube, fittings, and threads is necessary to create a smooth connection and prevent damage.
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PTFE hose fittings
Hose End Fittings
PTFE hose end fittings are available in various angles, including 45-degree, 90-degree, 120-degree, and 180-degree variants. These fittings are typically made of aluminum or stainless steel and are designed to secure the PTFE hose in place. The fittings are often designed with a swivel feature, allowing for easier installation and adjustment.
Hose End Sockets and Olive Inserts
The PTFE fuel hose is fitted with an aluminum hose end socket, ensuring a secure connection. It is crucial to pay attention to the fitment of the olive insert, which goes over the PTFE inner liner. The olive insert, typically made of aluminum, should reach the collar of the olive, providing a tight seal.
Lubrication and Assembly
Lubrication plays a vital role in assembling PTFE hose fittings. It is recommended to use grease or lubricant inside the socket to minimize friction and make the assembly process smoother. Additionally, the use of heat shrink tubing at each hose end is advised for optimal function and appearance, as it prevents the nylon braiding from threading up.
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