Ameer Randolph
There are many ways to make a shaped fuel line. Some methods involve using a fuel line bender, filling the line with sand or water and freezing it, or using a stove and building a jig. Other methods include using a hacksaw instead of a tubing cutter, using a flaring tool, or sending your existing lines to a company to be used as a template for new lines.
Characteristics and Values of Shaped Fuel Lines
| Characteristics | Values |
|---|---|
| Materials | Metal, stainless steel, aluminium, copper, rubber, plastic-coated steel, galvanized steel |
| Tools | Tube bender, hacksaw, tubing cutter, flaring tool, HF benders, stove, jig, heat gun, pipe bender, sand, spring, wire, air hose |
| Techniques | Bending, flaring, heating, freezing, lubricating |
| Vehicles | Triumph, BSA, Norton motorcycle, vintage cars, tractors |
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What You'll Learn
Using a jig to retain the line's shape
First, you'll need to create a jig that matches the desired shape of your fuel line. This can be done by wiring a piece of metal in the intended bend or shape. Ensure that the metal is thin and flexible enough to bend to your desired shape. You can use a stove or any other heat source to heat the metal gently and bend it to the required form.
Once you have your jig ready, you can start preparing your fuel line. Choose a fuel line with a thin wall, as these are easier to shape. Insert a stiff, ridged wire inside the fuel line and bend it to match the shape of your jig. Make sure you leave a little extra wire on each bend to ensure the fuel line holds its shape.
Now, place the fuel line with the wire inside into warm water, slightly below boiling temperature. Let it heat soak for around 5 minutes. You can also use a heat gun for this step if you prefer. After heating, immediately place the fuel line into cold water to set the shape.
Remove the wire from the fuel line, and your shaped fuel line is now ready! This method is a great way to achieve precise and consistent results when shaping fuel lines.
Additionally, you can also use a rod instead of wire for shaping longer fuel lines, as it holds its shape better over longer lengths. Steel rods, in particular, are a good option and can be straightened and reused if needed.
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Bending metal lines
Another technique involves inserting a stiff wire inside the metal line and bending it to shape. The metal line with the wire inside is then placed in warm water for a few minutes before being transferred to cold water to set the shape. This approach is similar to the process used for rubber fuel lines.
When working with sheet metal, precise bend lines can be drawn using CAD (Computer-Aided Design) software. By determining the bend allowance, production workers can then bend the sheet metal accordingly. It is important to consider the sheet metal thickness and compensation factor when calculating the bend allowance.
Additionally, air bending is a method used to form sheet metal and plastic parts. This process involves bending the material along a reference line, resulting in witness marks where the tooling contacts the part. To avoid feature distortion, cut features should not fall within the die lines or bend area.
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Using a spring to prevent kinking
When making a shaped fuel line, one of the challenges is preventing kinks from forming in the hose. One solution to this problem is to use a spring to support the hose and prevent kinking. This technique involves placing a spring inside or outside the fuel hose to provide structural reinforcement and maintain the desired shape.
To implement this method, start by sourcing an extension coil spring that is slightly larger in diameter than the fuel hose. It is important to find the correct size spring that fits snugly around the hose without restricting the flow. Slide the spring over the hose, ensuring it covers the sections that require sharp bends. This technique is particularly useful when creating complex shapes, such as S-shaped or 90-degree bends, as it allows you to make sharper bends without the hose collapsing or kinking.
The spring acts as a flexible skeleton, providing rigidity and support to the fuel hose. It helps to distribute the stress evenly along the length of the hose, reducing the likelihood of kinks forming. The spring also ensures that the hose retains its shape over time, preventing it from gradually returning to its original form or collapsing due to the weight of the fuel it carries.
When using a spring to prevent kinking, it is essential to consider the material and thickness of the fuel hose. Thinner-walled hoses are more susceptible to kinking and may require additional support. Additionally, the spring should be made of a material that is compatible with the fuel type and resistant to corrosion. Stainless steel or aluminium springs are often used for their durability and resistance to rust.
By employing this spring method, you can create shaped fuel lines that are both functional and durable. It offers a simple yet effective solution to the common issue of kinking, allowing you to achieve the desired bends and shapes without compromising the integrity of the fuel hose. This technique is a valuable tool for anyone looking to customise their fuel lines or tackle the challenges of shaping hoses in tight spaces.
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Crimping and cutting custom fuel lines
Firstly, you will need to disconnect the fuel line from the vehicle. This can be done by heating the line to soften it and then removing the fittings. It is important to ensure the line is free of any fuel or gas residue. Once the line is disconnected, you can start cutting and shaping your new line.
When cutting the fuel line, ensure that you are happy with the final length before moving on to the next step. It is important to measure accurately and cut the line to the exact size needed. Once cut, slip a ferrule on each end of the line. Before crimping, make sure the line is pushed all the way in and bottomed out on the fittings. If the line is not bottomed out, your measurements may be affected, and the line may be too long or short.
To crimp the line, use a 1/2" ferrule crimping tool and place it over the ferrule. Screw the plastic knob clockwise until the ferrule is crimped. Then, unscrew the knob and finish crimping any other ferrules in the same way. Always tug on the hose to ensure a tight connection.
There are also alternative methods to shape fuel lines. One way is to use a thin-walled fuel line and insert a stiff wire, bending it to the desired shape. The line and wire are then placed in warm water for around five minutes before being transferred to cold water to set the shape. Another method is to blow out the line with an air hose to ensure it is completely dry, then cut and insert a copper wire, bending it to shape.
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Using a flaring tool
When fabricating lines, it is important to take your time and get it right. Poorly fabricated lines can lead to time-consuming and costly issues like leakage. It is mandatory to apply a double flare to every line end and fitting. This can be done using a double-flaring tool, which is available for a low price from sources like Harbor Freight Tools. The process of creating a double flare involves two steps. First, create a bubble flare by extending the line to the width of the die. Then, roll the sides of the bubble flare inward to produce the 45-degree double flare.
In addition to using the right tools, it is important to use the correct techniques and materials when making a shaped fuel line. When flaring brake and fuel lines, it is suggested to use a lubricant at the flaring head and line end to make the process smoother. For fuel lines, a low-viscosity engine oil or WD-40 can be used as a lubricant. It is also important to ensure that the line is free of any gas or fuel residue before beginning the fabrication process.
By following these instructions and taking your time, you can successfully use a flaring tool to make a shaped fuel line.
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Frequently asked questions
You can cut, crimp and make your own custom fuel line assembly. First, remove the fittings from the existing fuel line. Then, measure the length of the original bare fuel line and cut your new fuel line to the same size. Slip a ferrule on each end of the line and use a 1/2" ferrule crimping tool to crimp the ferrules.
There are a few ways to do this. One way is to fill the hose with sand or another suitable small grain medium, cap the ends, bend the hose, and then empty and flush it out. Another way is to insert a stiff wire into the hose, bend it to shape, and then place it in warm water for about 5 minutes before transferring it to cold water to set the shape.
Tube bending and flaring tools are available from a variety of sources, including Harbor Freight Tools and The Eastwood Company. You can also use a hacksaw, a stove, a jig, a flaring lubricant, and a fuel line bender.
There are a few different types of tubing that can be used, including stainless steel, galvanized steel, copper, and aluminium. Stainless steel is harder than galvanized steel and therefore more challenging to work with, but it virtually never corrodes and will outlast any other material.
