Sylvie Willis
Flaring a fuel line is necessary when creating custom fuel systems for vehicles like street rods, kit cars, or classic muscle cars. The process involves cutting the line to the proper length, using a deburring tool to clean the inner edge, and then flaring the ends for installation. The 45-degree inverted flare is the most common style used in automotive hard lines, but 37-degree flare tools are also available. When flaring metal fuel lines, it is important to use the correct tools and techniques to ensure safety and prevent leaks.
Do I need to flare fuel lines?
| Characteristics | Values |
|---|---|
| When to flare | When building a street rod or kit car or upgrading the drum brake system on a classic muscle car |
| Tools required | Tube bender, 37-degree flare tool, 45-degree flare tool, 45-degree inverted flare tool, brake line flaring tool, double bubble flare tool |
| Techniques | Bending, bubble flare, double flare, single flare |
| Materials | Steel, stainless steel, copper, aluminium |
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What You'll Learn
Flaring tools for metal fuel lines
Flaring tools are used to create a flare at the end of a fuel line, which helps to securely connect the line to a hose or fitting. While some people choose to simply clamp their fuel lines without flaring, this practice has been known to fail, and flaring the line first can help to prevent accidents.
There are a variety of flaring tools available for creating flares in metal fuel lines. The type of tool you will need depends on the material of your fuel line (e.g. steel, stainless steel, or copper) and the size of the line. Basic flaring tool kits can be purchased for as little as $11.68, while more expensive, specialised tools can cost upwards of $300.
If you are flaring a steel fuel line, a standard brake line flaring tool should work. For stainless steel lines, a double bubble flare tool is required. These tools are more expensive and can be difficult to find, but they can usually be sourced from shops that build hydraulic lines for commercial equipment. If you are flaring a copper gas line, a basic $13 kit should suffice.
When using a flaring tool, it is important to follow the correct procedure to create a safe and effective flare. This may involve clamping the line tightly in a block and using a "bubble flare" technique, where the first step of a double flare is performed to create a perfect bubble for slipping a hose over.
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The 45-degree flare tool
Flaring a fuel line is necessary to create a smooth and consistent flare without causing any damage. RIDGID's Model 345 Flare Tool is a precision-designed 45-degree flare tool that can be used to create flares in soft copper, brass, aluminum, and mild steel tubing. This tool is ideal for achieving professional-looking results and ensuring a secure connection for fuel lines.
RIDGID, a well-known manufacturer of pipe flaring tools, offers a range of 45-degree flare tools that cater to different tubing materials. Their tools are designed to work with various metals, including steel, mild steel, stainless steel, brass, aluminum, hard copper, and soft copper. This versatility allows users to flare fuel lines made from different materials without causing damage or compromising the integrity of the connection.
Additionally, the 45-degree flare tool can be found at plumbing and auto shops, as well as online retailers. It is important to choose the right tool for the specific tubing material and to follow the manufacturer's instructions for safe and effective flaring. With proper use, the 45-degree flare tool can make fuel line maintenance and repairs more accessible and ensure reliable connections.
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Bending tools for fuel lines
Bending tools are essential for creating precise and kink-free bends in fuel lines, improving the overall efficiency of the process. These tools are designed to be used with fuel lines made from various materials, including steel, copper, and aluminium.
One such tool is the hand tubing bender, which can be used to bend fuel lines without causing kinks. The Eastwood Easy Bend Line Set Kit, for example, includes a tubing bender and forming pliers that allow users to create smooth, kink-free bends in fuel lines. The kit is rated for use with copper, aluminium, and steel lines, ensuring versatility. The comfort-grip handles on the pliers also reduce user fatigue, making the job more comfortable.
Brake and fuel line bending pliers are another option. These pliers are designed to bend, align, and adjust fuel lines without causing kinks. The unique design of these pliers provides a flush (flat) surface on one side of the bending head, allowing for tight radius bends right up against tube nuts or obstructions.
For those seeking to create their own stainless steel fuel lines, a flaring tool may be required to replicate the flares found on the old lines. This can be a challenging task, as special machines are often needed to create these flares. However, some shops that fabricate hydraulic lines may be able to provide assistance.
When it comes to purchasing bending tools for fuel lines, online retailers like Amazon offer a range of options, including fuel line bending tools and kits. It is important to consider the material and size of the fuel lines being worked on to choose the appropriate tool. Additionally, some tools may be more suitable for creating specific types of bends, such as tight radius bends or 360-degree bends.
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The double flare
To create a double flare, a flaring tool is required. The process involves using a forcing cone double flaring adapter to create the first step of the flare, and then tightening the forcing cone a second time to fold the line down and create the second flare. This two-step process results in a more secure connection compared to a single flare.
The 45-degree inverted flare is a common type of double flare used in automotive hard lines, including fuel lines. It is often abbreviated as IFF when shopping for fittings. This type of flare does not require a tube sleeve or flare seat support due to the extra wall thickness provided by the double flare design.
While the double flare is considered a safer option, it may not be suitable for all materials. For example, stainless steel lines are more challenging to work with and cracks may form if a double flare is attempted. In such cases, a single flare or other joining methods, such as compression fittings, may be considered.
It is important to note that working with fuel lines can be dangerous, and it is always recommended to seek professional assistance or refer to detailed guides and instructions specific to your vehicle when performing any repairs or modifications involving fuel lines.
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Flaring for rubber hose
Flaring is the process of shaping the end of a fuel line to fit securely onto the corresponding fitting. It is often used in conjunction with rubber hoses, which provide flexibility and ease of installation.
To flare a fuel line for a rubber hose, you will need a few specific tools. These include a flaring tool, a ruler, a cutter, and a marker. The flaring tool is critical for creating flares in the ends of the pipes, while the ruler, cutter, and marker will help you measure, cut, and mark the pipe accurately.
- Place the fuel line into the flaring tool and tighten it to hold the line in place. Ensure that the flaring tool matches the size of your fuel line.
- Use the tubing cutter to cut the end of the fuel line at a 90-degree angle. This will ensure that the flare is formed properly.
- Utilize the cone-shaped flaring tool to create the flare by slowly turning the tool handle to shape the end of the line.
- Tighten the flare nut on the rubber hose onto the flare.
- Secure everything properly before starting your vehicle.
It is important to note that flaring a fuel line for a rubber hose requires precision and patience. A job done properly will prevent leaks while driving.
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Frequently asked questions
Flaring the end of a fuel line ensures that it doesn't come shooting off. While it is possible to clamp a fuel line without flaring, it is not recommended.
You will need a flaring tool, a tube bender, and a deburring tool.
The Rigid 37* flaring tool is highly recommended, although it is more expensive than other options.
