Rajan Wilcox
Bubble flaring a fuel line is a process that involves creating a bubble-like flare at the end of a fuel line to facilitate a secure connection with a hose. This technique is commonly used in automotive applications to ensure a tight seal and prevent fuel leaks. While some individuals opt for professional tools to achieve this, others explore more cost-effective methods, such as renting tools or purchasing cheaper alternatives. The process of bubble flaring a fuel line requires careful execution to avoid damage to the internal components of the fuel line, and it is recommended to practice on scrap pieces before attempting the final flare.
How to Bubble Flare a Fuel Line
| Characteristics | Values |
|---|---|
| Tools | Bubble flare tool, bead roller, flaring tool, swagelok fitting, Titan hand tool, Summit tool, Parker beading tool, Jeg's EZ Beader, tubing cutter |
| Techniques | Using a bubble flare tool to replicate a bead-rolled end, using a clamp, using a die to make the flare, using a hose clamp, using a single flair on the end of the line |
| Concerns | Leaking, difficulty getting the rubber hose over the "square face", scoring of the tubing, cracking of the tube, damaging the internal braid, misalignment of the two halves of the clamp |
| Tips | Use a small section, use multiple hose clamps, ensure the hose is rated for the pressure, practice first, use a high-end tool, use a simple tool, use a mini kit, use Vaseline, use a tubing cutter |
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What You'll Learn
Using a bubble flare tool
There are various bubble flare tools available in the market, ranging from cheaper options to more expensive, high-end tools. It is important to note that cheaper tools may not always provide satisfactory results and can sometimes score the tubing. Therefore, investing in a higher-quality tool, such as the Parker tool or the Summit tool, can be a better option. These tools offer more precise and consistent results, ensuring a proper seal and avoiding potential leaks.
When using a bubble flare tool, it is essential to follow the correct procedure to ensure a successful flare. This includes properly securing the fuel line in the tool, applying grease to the tool and inside the tube, and carefully forming the bubble flare to match the desired shape. In some cases, you may need to practice and refine your technique to achieve the perfect flare.
Additionally, it is worth noting that the bubble flare tool may not be suitable for all types of tubing. For example, some users have mentioned that the bubble flare tool can crack the inside of the tube, especially if the tubing is not held tightly enough. In such cases, it may be necessary to explore other flaring methods or seek professional assistance from shops that specialise in building hydraulic lines for commercial equipment.
Overall, using a bubble flare tool can be an effective way to create bubble flares on fuel lines, but it requires careful selection of the right tool and a good understanding of the technique to ensure successful and safe results.
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Connecting a hard factory fuel line to a soft hose
Another approach is to use AN fittings, which may involve cutting and converting the hard line. This method can be more secure but also more time-consuming and expensive. It is important to ensure that the hose you are using is rated for the pressure you intend to use. Additionally, using multiple hose clamps at each connection can provide extra security and prevent leaks.
When creating flares, it is essential to use a high-quality flaring tool to achieve precise and clean flares. While cheap tools may work, they tend to score the tubing and leave marks. Investing in a higher-end bead roller or a sophisticated flaring tool can ensure better results and peace of mind. Some recommended tools include the Parker beading tool and the Jegs EZ Beadier.
Practicing on scrap tubing or performing trial flares can help you perfect your technique before attempting the final connection. Additionally, seeking assistance from professionals or shops that specialize in fabricating fuel lines and flares can be beneficial if you are unsure about the process or encounter challenges.
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Using hose clamps
To bubble flare a fuel line using hose clamps, you will need to follow a few important steps to ensure a safe and secure connection. Here is a detailed guide:
First, it is crucial to use the correct tools for the job. The quality of your tools will determine the quality of your flare, which directly impacts the safety and durability of the fuel line connection. You will need a tube cutter, a deburring tool, a flaring tool, and high-quality hose clamps.
Begin by using the tube cutter to cut the fuel line to the desired length. Ensure that the cut is straight and clean; a crooked cut can lead to an uneven flare. After cutting, use the deburring tool to smooth out both the inside and outside edges of the tube. This step is crucial to prevent the tube from cracking when it is flared.
Next, insert the tube into the flaring tool. Specifically, insert the tube into the appropriate-sized die in the flaring tool. The amount of tube sticking out should be equal to the thickness of the tubing, as this will determine the size of the flare. Tighten the clamp to hold the tube securely in place.
Now, you can create the flare. Apply pressure slowly and carefully to form the flare. Do not overtighten, as this will distort the tube and result in an uneven flare that will not seal properly. Stop applying pressure once the flare is fully formed.
Finally, attach the rubber hose. Slide the rubber hose over the flared end of the tube. The flare should create a tight fit inside the hose, providing a secure connection. Use a high-quality clamp, such as a fuel injection-type clamp, to secure the hose in place.
It is important to note that some people have mentioned doing a "`partial`" bubble flare, especially when using a double flare tool. This means only completing the first step of the flaring process to create a small bubble that increases the diameter of the tube. This method can help prevent the hose from being damaged or overly stretched by the flare. However, it is crucial to ensure that the clamp is tight and secure to prevent any leaks.
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Flaring for AN fittings
To create a flare for AN fittings, you will need a flaring tool and two adjustable wrenches. The flaring tool is used to reshape the end of the tube or pipe, creating the flare that will be pressed against the fitting. The adjustable wrenches are used during the connection and tightening process.
- Choose the appropriate hole in the flaring block that matches the outside diameter of the tube or pipe you are working with.
- Use the flaring tool to "'flare" or expand and deform the end of the tube. This can be done by gripping the tube with a die and forcing a mandrel or rolling cone into the end to form the flare.
- Slide the flare nut onto the tube before flaring the end.
- Connect and tighten the joint. Place one wrench on the union and one on the nut. Be careful not to overtighten the flared joint. Once snug, give each nut a half-turn.
- Test the connection by turning on the water or relevant fluid. If the joint leaks, tighten carefully until the leak stops. If the leak persists, dismantle the joint and examine for any issues, such as an uneven cut on the tubing or cross-threading on the fitting.
- Anchor or support the tubing with two feet on either side of the flare fitting for added stability.
It is important to note that flare fittings are typically used with soft metals like steel, copper, and aluminium. The process of flaring for AN fittings may vary slightly depending on the specific application and materials used.
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Using a bead roller
Bead rollers are a type of tool used to create a bubble flare on a fuel line. They can be expensive, so some people opt to build their own. For example, one person removed the blade from a pipe cutter and fabricated a bead roller onto it.
There are a variety of bead rollers available on the market, including the JEG's EZ Beader, the Parker bead roller, and the OTC bubble flare set. It is recommended to spend a little more money on a higher-end bead roller to avoid issues with cheaper tools, such as scoring the tubing. The Parker bead roller, in particular, is praised for producing perfect beads, although it is quite expensive.
When using a bead roller, it is important to ensure that the line is clamped tightly in the block to avoid damaging the internal braid of the fuel line. It is also a good idea to apply some grease or Vaseline to the tool and inside the tube to prevent cracking and make the process smoother.
Some people also choose to perform only the first step of a double flare, which creates a small bubble that is perfect for slipping a hose over. This can be done with a rental double flare kit or a simple flare tool that clamps the line and uses a die to create the flare. However, it is important to ensure that the two halves of the tool are aligned correctly to avoid bad flares.
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Frequently asked questions
You can use a bubble flare tool to replicate a bead-rolled end similar to an OEM barbed end and then push a soft fuel hose over the flared end. Secure it with a fuel hose clamp.
You can use a bubble flare tool or a bead roller. You can find these tools at various price points at retailers like Amazon, O'Reilly's, Auto-Zone, and Aircraft Tool Supply.
Make sure the two halves of the tool line up correctly. Any misalignment will result in bad flares. Practice using the tool on a few pieces first.
Some people have mentioned using AN fittings or simply cutting the line and using a flare tool to convert it to AN fittings.
