Ameer Randolph
Flaring a fuel line is the process of creating a flare at the end of a fuel line. This is the last step in building a custom line for a fluid transfer project. The most common style of flare used in automotive hard lines is the 45-degree inverted flare, although 37-degree flares are also used. When flaring a fuel line, it is suggested that you use a lubricant at the flaring head and line end.
| Characteristics | Values |
|---|---|
| Flaring a fuel line | The last step in building a custom line for a fluid transfer project |
| Flaring tools | 45-degree flaring tools are more common with stock components; 37-degree flaring tools are used with high-performance braking components, high-pressure EFI-compatible fuel lines, and other aftermarket pieces that generally use AN fittings |
| Flaring lubricant | For fuel lines, use a low-viscosity engine oil or WD-40 |
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What You'll Learn
Flaring tools
When flaring brake and fuel lines, it is suggested you use a lubricant at the flaring head and line end. For brake lines, use brake fluid as a lubricant. For fuel lines, use a low-viscosity engine oil or even WD-40 as a flaring lubricant. It is mandatory to apply a double flare to every line end and fitting.
When installing a fuel line, it is recommended to only install the line with half of the appropriate depth, as a full bubble flare is too big to easily slip a hose over.
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Cutting the line
Flaring a fuel line is the last step in building a custom line for a fluid transfer project. Before you can flare a fuel line, you need to cut the line to the correct length. To do this, you will need a tubing cutter. You can start with a bulk roll of line or standard sticks of 3/16 brake line.
The 45-degree inverted flare is the most common style of flare used in automotive hard lines like brake, fuel, and transmission fluid transfer. If you are restoring a vehicle and using stock brake components, a mechanical fuel pump, etc., you will need 45-degree flaring tools. On the other hand, if you are planning on using high-performance braking components, high-pressure EFI-compatible fuel lines, and other aftermarket pieces that generally use AN fittings, then you will need a quality 37-degree flaring tool.
AN fittings get a 37-degree flare. When you are flaring brake and fuel lines, it is suggested you use a lubricant at the flaring head and line end. For fuel lines, use a low-viscosity engine oil or even WD-40 as a flaring lubricant.
When installing the line, be aware that a full bubble flare may be too big to easily slip a hose over. You may damage the internal braid on the fuel line if you try to cram it over a too-large flare.
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Flaring lubricant
Flaring a fuel line involves cutting the line to length and then using a flaring tool to create a flare at the end of the line. The 45-degree inverted flare is the most common style of flare used in automotive hard lines like fuel lines. However, if you are planning to use high-performance components that generally use AN fittings, then you will need to use a 37-degree flaring tool.
When flaring a fuel line, it is suggested that you use a lubricant at the flaring head and line end. This makes the process smoother. For fuel lines, a low-viscosity engine oil or even WD-40 can be used as a flaring lubricant.
It is important to note that the flare should not be too large, as this can make it difficult to slip a hose over the end of the line. Additionally, a too-large flare can damage the internal braid of the fuel line.
Overall, flaring a fuel line is a straightforward process, but it requires the right tools and preparation to ensure a smooth and successful outcome.
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Flaring styles
Flaring a fuel line is the last step in building a custom line for a fluid transfer project. The 45-degree inverted flare is the most common style of flare used in automotive hard lines like brake, fuel, and transmission fluid transfer. However, the style of flare you use will depend on the components you are restoring or planning to use. For example, if you are restoring a vehicle and using stock brake components, a mechanical fuel pump, etc., you will need to use 45-degree flaring tools. On the other hand, if you are planning to use high-performance braking components, high-pressure EFI-compatible fuel lines, and other aftermarket pieces that generally use AN fittings, you will need to use a 37-degree flaring tool. AN fittings get a 37-degree flare.
It is mandatory to apply a double flare to every line end and fitting. When flaring brake and fuel lines, it is suggested you use a lubricant at the flaring head and line end to make the process smoother. For brake lines, use brake fluid as a lubricant. For fuel lines, use a low-viscosity engine oil or even WD-40 as a flaring lubricant.
Some people choose to only install the line with half of the appropriate depth, as a full bubble flare is too big to easily slip a hose over.
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Flaring and hose compatibility
When flaring fuel lines, it is crucial to consider the compatibility with the hose. A full bubble flare, for example, may be too large to easily slip a hose over, as mentioned by a user who damaged the internal braid of a fuel line when trying to force it over a too-large flare. Therefore, it is important to flare the line to the appropriate depth to ensure a proper fit with the hose.
The type of fittings also plays a role in hose compatibility. AN fittings, commonly used in high-performance applications, require a 37-degree flare. It is mandatory to apply a double flare to every line end and fitting when working with AN fittings. Additionally, using a lubricant at the flaring head and line end can make the process smoother. For fuel lines, a low-viscosity engine oil or WD-40 can be used as a suitable lubricant.
In summary, flaring and hose compatibility in fuel lines depend on several factors, including the flare angle, the depth of the flare, the type of fittings, and the use of lubricants. By considering these factors and choosing the appropriate tools and techniques, a secure and compatible connection between the fuel line and the hose can be achieved.
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Frequently asked questions
Flaring is the last step in building a custom line for a fluid transfer project.
You will need a 45-degree flaring tool for stock components or a 37-degree flaring tool for high-performance braking components and high-pressure EFI-compatible fuel lines.
The 45-degree inverted flare is the most common style used in automotive hard lines like brake, fuel, and transmission fluid transfer.
The first step is cutting the line to length.
You should use a low-viscosity engine oil or WD-40 as a flaring lubricant.
