Katerina Swanson
Connecting a plastic fuel line to braided steel lines can be a tricky process. While some people opt for a compression fitting that doesn't require flaring, others choose to cut the hard lines and flare the ends before adding adapters. The type of fitting chosen depends on the specific application and personal preference. It's important to note that the wrong fittings can lead to leaks, so it's crucial to select the correct type and ensure proper installation. Seeking guidance from reputable sources and forums is always recommended when tackling such tasks.
Characteristics and Values Table:
| Characteristics | Values |
|---|---|
| Fuel Line Material | Plastic, Nylon, Steel, Rubber, Aluminium, Braided Stainless Steel |
| Fittings | Summit Racing AN to Tube Adapter, Russell Performance Tube Nuts, Russell Performance AN to Inverted Flare Fittings, Russell Performance Fuel Line Adapters, Earl's Performance Swivel-Seal Hose Ends, Male Spring Locks, Russell Hard Tube Adapter, Russell Specialty Adapter Fitting |
| Tools | Flaring Tool, Teflon Tape, Liquid Pipe Dope, Push Lock |
| Considerations | Fuel Type, Line Size, Cost, Flow Rate, Heat, Debris, Safety, Corrosion, Leaks, Permeation, Clamps, Connections, Flexibility |
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What You'll Learn
Using compression fittings
Compression fittings are commonly used to connect rigid fuel lines. They are typically used with plastic or nylon fuel lines and are relatively affordable, with prices ranging from $2 to $5 per fitting. This type of fitting consists of a threaded nut and a ferrule that compresses onto the fuel line, creating a tight seal.
To use a compression fitting to connect a plastic fuel line to a braided line, you will need to cut the plastic line with a razor blade or a tubing cutter to ensure a fresh section for the connection. You can then follow these steps:
- Purchase a compression fitting with a cap nut and ferrule, specifically designed for plastic or nylon fuel lines. These fittings are typically inexpensive and can be found at most auto parts stores or online.
- Prepare the compression fitting by unscrewing the threaded nut and separating the two pieces of the fitting.
- Insert the ferrule end of the compression fitting onto the plastic fuel line, ensuring that it is securely seated and does not obstruct the flow of fuel.
- Screw the threaded nut onto the ferrule by hand until it is snug, ensuring that the threads are aligned correctly.
- Use a suitable tool, such as a wrench or a clamp block, to tighten the threaded nut further. Be careful not to overtighten, as this may damage the fitting or the fuel line.
- Check the connection for any signs of leaks or damage. If necessary, adjust the fitting or consult a professional for assistance.
It is important to note that when working with fuel lines, safety should be a top priority. Ensure that you are working in a well-ventilated area and that there are no open flames or sparks that could cause an explosion. Always refer to the manufacturer's instructions or seek advice from a qualified mechanic if you are unsure about any part of the process.
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Flaring the end of the steel line
Flaring the end of a steel line is a tricky task that requires careful attention to detail. It is a common step when connecting plastic fuel lines to braided lines, and it is important to get it right to avoid leaks and ensure a secure connection. Here is a step-by-step guide to help you through the process:
First, you need to select the appropriate flaring tool. This choice is crucial, as using the wrong tool can lead to a compromised connection or even damage the line. The most common flaring tools create either a 45-degree or a 37-degree flare. The fancy red and blue AN fittings, often used in automotive applications, require a 37-degree flare. A standard automotive or plumbing tool usually creates a 45-degree flare, which is not suitable for AN flare fittings as it can cause excessive stress and lead to leaks or failure. So, make sure you select the correct tool for your specific application.
Next, you need to prepare the end of the steel line. Cut the end of the pipe square, or at a right angle, using a tubing cutter. This step is important to prevent leaks. After cutting, remove any burrs or sharp edges using a deburring tool. Then, chamfer, or bevel, the edge of the pipe according to the instructions provided with your chosen flaring tool. This typically involves cutting at a specific angle, such as 0.25 x 45 degrees. If your steel line has a plastic covering, be sure to remove at least 3mm or more of the covering from the end to expose the metal.
Now you are ready to create the flare. Follow the instructions provided with your chosen flaring tool. This process typically involves clamping the tool onto the end of the pipe and then tightening or compressing it to create the flare. It is important to wear appropriate personal protective equipment, such as safety glasses and gloves, during this step to protect yourself from any sharp metal edges or debris.
Finally, clean and polish the flared end to ensure there is no grease or oil that could contaminate the fuel. A Scotch-Brite pad should be sufficient for this step, but there are also specialised lapping tools available to ensure a perfect seal.
Creating a good flare on a steel line can be challenging, but with the right tools, careful preparation, and attention to detail, it can be done successfully. Always refer to your vehicle's specifications or consult a professional if you are unsure about any steps in the process.
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Using Russell Performance Tube Nuts
Russell Performance Tube Nuts are a type of compression fitting that can be used to connect plastic fuel lines to braided lines. Compression fittings are commonly used to connect rigid fuel lines and consist of a threaded nut and a ferrule that compresses onto the fuel line, creating a tight seal.
To use Russell Performance Tube Nuts, first cut the hose to the desired length. Then, install the Russell Performance Tube Nut over the hose. The tube nut goes on the aluminium tube, followed by a male-to-male adapter, and then a female AN fitting. If you are using a braided hose, a standard AN fitting should be used instead of a barb fitting.
It is important to note that the outer nut of the Russell Performance Tube Nut can damage easily, so be sure to protect it during installation. One way to do this is by using aluminium inserts in the vise to protect the fitting. Alternatively, a thick rag can be used, but be careful not to clamp the vice too tight, or the outer nut may become distorted.
Russell Performance offers a range of products that are compatible with braided lines, including the Edelbrock 27" Braided Fuel Line Kit for B/B Racing Fuel Pumps with 1/2" NPT Outlets to Regulator Kits. This kit includes a pre-assembled hose with hose ends. Russell Performance also offers the ProClassic hose, which is a lightweight and easy-to-assemble option for racers and performance enthusiasts.
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Using Summit Racing
Summit Racing offers a wide range of fuel lines and adapters, which can be used to connect plastic fuel lines to braided lines. Braided fuel lines are typically made of rubber with a braided stainless steel or nylon exterior, and they use AN hose ends to connect to the rest of the fuel system.
To connect plastic fuel lines to braided lines, you can use the following Summit Racing products:
Fuel Line Connectors
Summit Racing provides plastic fuel line connectors in various sizes and angles, including straight and 90-degree connectors. These connectors come in black or white and are designed to fit specific line sizes, such as 5/16 inch or 3/8 inch. They offer both quick-connect and hose barb styles, ensuring a secure connection between the plastic and braided fuel lines.
Fuel Line Adapters
Summit Racing also offers a range of fuel line adapters that can facilitate the connection between plastic and braided fuel lines. These adapters come in different configurations, such as straight or 45-degree angles, and various sizes. For example, they have adapters with 3/8 inch female quick-connect ends and 3/8 inch male quick-connect ends. Additionally, Summit Racing provides specialty adapters, like banjo fittings with -6 AN male flares, which can be used in specific vehicle models.
Braided Fuel Lines
When selecting a braided fuel line from Summit Racing, you can choose between different materials, such as braided nylon with a vinyl cover or braided stainless steel with an anodized aluminum finish. These fuel lines come in various diameters, such as 5/16 inch or 3/8 inch, and are compatible with specific vehicle makes, including Cadillac, Chevy, and GMC.
PTFE Lined Hose
If you're looking for a high-performance option, Summit Racing offers PTFE-lined hoses with a braided stainless steel or nylon exterior. PTFE lining prevents fuel vapors and slows degradation. However, keep in mind that PTFE braided hoses require special fittings, and you cannot use standard AN fittings with this type of hose.
By utilizing the appropriate fuel line connectors, adapters, and braided fuel lines from Summit Racing, you can effectively connect plastic fuel lines to braided lines, ensuring a secure and reliable fuel system in your vehicle.
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Using Teflon tape
Teflon tape is a great way to coat the threads of your fittings to help prevent leaks. It is important to use a type of Teflon tape that is rated for fuels. To use it, simply cut the hard lines and flare the ends, then apply the Teflon tape to the threaded portion of the fittings. The tape will act as a sealant and help prevent any leaks.
When using Teflon tape, it is important to wrap the tape in the same direction that you would screw the fitting on. This will ensure that the tape doesn't unwind as you tighten the fitting. Start by wrapping the tape around the threaded area a few times, stretching it slightly as you go. Overlap the tape by about half its width with each wrap to ensure a good seal.
Once you've applied the Teflon tape, screw on the fitting by hand, making sure it's snug and tight. You can then use a wrench to tighten it further, but be careful not to overtighten it, as this can damage the tape and the fitting.
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Frequently asked questions
Summit Racing is a good option for braided lines and fittings. They have their own brand hoses and fittings that are of good quality.
It is important to use the correct fittings to avoid leaks. Teflon tape rated for fuels can be used to coat the threads to prevent leaks. It is also important to use a flaring tool with the correct angle for AN flare fittings.
Some specific products that can be used include Russell Performance Tube Nuts, Earl's Performance Swivel-Seal Hose Ends, and Summit Racing AN to Tube Adapter Fittings.
