Rajan Wilcox
Nylon fuel lines are a popular choice for vehicles due to their flexibility, durability, and resistance to rotting. However, one challenge that users may encounter is the difficulty of stretching the nylon over the fittings or steel tubing. Various methods have been suggested to address this issue, including heating the nylon with a heat gun or boiling water, using a hair dryer, or employing a large Phillips-head screwdriver to pry and stretch the nylon tubing. It is important to ensure that the inner diameters of the nylon and steel lines are compatible to avoid changes in flow characteristics and increased pressure. While nylon fuel lines offer advantages, they may not be suitable for all vehicles, especially in the engine bay or areas exposed to high temperatures.
Characteristics and Values of Nylon Fuel Lines
| Characteristics | Values |
|---|---|
| Durability | Nylon is durable and resistant to rotting, but can fail if moved too far |
| Flexibility | Nylon is pliable and can be bent by hand, but may not hold its shape as well as steel |
| Connections | Nylon lines require more frequent connections to the chassis than steel lines |
| Fittings | Nylon lines use compression fittings with a cap nut and ferrule, flare nut and cap fittings, or brass barbed splice fittings |
| Attachment | Attaching nylon to steel can be challenging due to differences in diameter; heating, prying, and lubricating may be required |
| Cost | Nylon lines range from $15 to $94, with pre-formed steel lines being cheaper |
| Safety | Nylon is generally safe for fuel lines, but some types may not have sufficient burst strength for fuel injection systems |
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What You'll Learn
Using a heat gun to stretch the line
Using a heat gun to stretch a nylon fuel line is a delicate process that requires careful attention to ensure the tubing doesn't get too hot and buckle or wrinkle. It is also important to ensure that the tubing gets warm enough to stretch over the fittings.
Firstly, set up your heat gun securely in a vise, so it doesn't move while you are working with the nylon tubing. This will help you to control how warm the tubing gets. Next, move the nylon tubing back and forth across the hot air stream from the heat gun. This will help you to control the temperature of the tubing and avoid overheating.
It is important to note that nylon fuel lines can be challenging to work with, and they may not be suitable for all fittings. For example, if the steel tubing is too much larger than the nylon tubing, it may not be possible to stretch the nylon tubing over it, even with the use of a heat gun. In some cases, it may be necessary to replace the line or use a different type of fitting.
Additionally, it is crucial to exercise caution when working with fuel lines, as gasoline vapors and heat sources can be a dangerous combination. Always work in a well-ventilated area and take appropriate safety precautions to avoid injury.
Finally, while a heat gun can be used to stretch nylon fuel lines, some people prefer using boiling water or a hair dryer as an alternative heat source. Ultimately, the choice of heat source will depend on your personal preference and the specific requirements of your project.
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Soaking the line in hot water
Soaking a nylon fuel line in hot water is a common method for softening and stretching the line to make it easier to install. This method is often preferred over using a heat gun due to safety concerns and the challenge of manoeuvring the line into a downward position to dip it into the water.
To use this method, one suggestion is to dip the line in boiling water for around 10 minutes to soften it. This can be tricky due to access restrictions, and the line may not always soften sufficiently. Combining this with another heat source, such as a hairdryer, can be beneficial.
Another approach is to use a rag saturated in boiling water and wrap it around the tubing. This method transfers enough heat to soften the line for installation without the need for a direct dip in boiling water.
For fixed lines that are challenging to access, one idea is to submerge a tool, such as a deep well socket or a tapered centre punch, in boiling water and then slip it over the outside or insert it into the inside of the nylon line to transfer the heat.
When softening the line with hot water, it is crucial to exercise caution due to the presence of gasoline vapours and the potential risks associated with heat, flame, and fuel.
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$13.59
Using a hair dryer to heat the line
Using a hair dryer to heat a nylon fuel line is a good alternative to using a heat gun or a naked flame, which could damage the line.
Firstly, you should mark the section of the fuel line you want to stretch. Then, apply heat evenly around the circumference of the marked section of the fuel line until it becomes pliable and soft. The ideal temperature is around 200-250 degrees Fahrenheit. Be careful not to overheat the fuel line as this can cause damage.
Once the fuel line is heated, use your hands to gently stretch it to the desired length. Be careful not to overstretch or kink the fuel line. If the fuel line starts to cool and stiffen, reheat it before continuing to stretch.
Once the fuel line is stretched to the desired length, hold it in place until it cools completely. This will ensure that the stretch remains permanent. After the fuel line has cooled, inspect it carefully for any kinks or damage. If you find any imperfections, reheat the fuel line and adjust the stretch as needed.
It is important to always wear gloves when handling a heated fuel line to protect your hands from the heat.
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Attaching nylon to steel
When it comes to attaching nylon to steel, there are a few methods that can be considered. One common approach is to use compression fittings designed specifically for connecting nylon to steel. These fittings allow for a secure connection between the two materials. Another method is to use adhesives, although this can be challenging due to the chemical stability of nylon, which makes it difficult to glue. However, some industrial-strength adhesives, such as hot resorcinol, can be used for bonding nylon to steel. It is important to understand the expansion of nylon in a wet environment before gluing or screwing down wear strips.
In some cases, it may be possible to weld a barrier around the nylon to keep it from sliding, providing a more permanent attachment to steel. Additionally, nylon can be stretched and formed to fit over steel components. This can be achieved by using a heat gun or soaking the nylon in hot water to soften it, allowing it to stretch over the steel. However, it is important to exercise caution when using heat or flame near fuel lines to prevent any safety hazards.
When working with nylon fuel lines, it is essential to consider their compatibility with the fuel type and the temperature conditions they will be exposed to. Nylon fuel lines are known for their flexibility and ease of bending and flaring, but they may not be suitable for all engine compartments or high-temperature environments. In some cases, steel lines may still be preferred for their durability and shape retention.
It is always recommended to consult with professionals or experts in the field when dealing with fuel lines or adhesives to ensure safe and effective installations and repairs. The specific application and requirements will determine the best method for attaching nylon to steel.
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Using a tubing flare end kit
Firstly, use a razor blade or tin snips to cut back the plastic line and create a fresh section for the new fitting. It is important to ensure that the inner diameters of the nylon and steel lines are the same to maintain proper flow characteristics and prevent an increase in pressure.
Next, heat the nylon tubing. This can be done using a heat gun, boiling water, or a hairdryer. Some people express concern about using a heat gun inside a car due to safety risks. Boiling water may not be hot enough to sufficiently heat the line, and a hairdryer can be used to direct heat to a specific area of the line.
Once the nylon tubing is heated, it becomes more malleable. At this point, you can slide the fitting into the line. Some people recommend heating the fitting itself in boiling water before installation to prevent the plastic line from cooling and shrinking too quickly.
After the fitting is in place, you can attach any additional components as needed. It is important to follow safety precautions when working with fuel lines and ensure that all connections are secure to prevent leaks.
Additionally, it is worth noting that creating a bubble end on the nylon line can be tricky. While a bubble can help secure the line to the clamp, it requires a specific tool and practice to ensure a uniform expansion. An alternative method is to use a double flare tool, which can also effectively secure the line.
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Frequently asked questions
Nylon fuel line is not very forgiving, especially if it is the rigid type. You can try heating the nylon tubing and pushing it onto the steel tubing, but this may not work if the steel tubing is much larger than the nylon. You can also try getting a large Phillips-head screwdriver and working it around, prying it side to side until you get it to stretch.
Before attempting to stretch the nylon fuel line, make sure that the inner diameters of the two lines are the same to avoid pressure back-up. You can also try spraying silicone or motor oil on the steel tube to get it to go on.
You can use a heat gun, boiling water, or a hair dryer to heat the nylon fuel line. A tubing flare end kit can be bought for less than $20, and a tubing cutter can be bought for less than $10.
Stretching the nylon fuel line over a barb that is too large can cause premature failure. Nylon fuel line is also not suitable for use in the engine bay or anywhere it could be exposed to temperatures over 200 F.
