Sylvie Willis
Connecting a rubber fuel line to a hard line is a task that requires careful attention to safety. The connection between a metal line and a hose can be challenging to seal, and the high pressure of fuel injection lines means that leaks can be dangerous. There are various methods for making this connection, including using a hose barb, a tubing-to-hose adapter, or a compression fitting. Some sources recommend using a double flare union for a positive seal, while others suggest a pushlok fastener or fuel injection clamps. It is important to avoid using certain types of hoses, such as braid stainless steel lines, which may not meet safety standards and could be susceptible to damage.
Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Fuel line material | Rubber, braided stainless steel, Teflon-coated, nylon, steel, aluminium |
| Hose type | EFI, bubble flare, pushlok, braided, radiator style, fuel injection |
| Clamps | EFI hose clamps, fuel line clamps, cushion clamps, standard clamps, worm gear clamps |
| Cutting tools | Mini tubing cutter, tubing bender, tubing to hose adapter, barb adapter, flaring tool, swedging tool |
| Fittings | Compression, double flare, union, brass, AN(JIC), GM style, OEM |
| Safety | Leaks, sharp edges, debris damage, fire, EPA, SAE and CARB standards, ethanol content |
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What You'll Learn
Use a hose barb and a bubble flare kit
To connect a rubber fuel line to a hard line, you can use a hose barb and a bubble flare kit. This method involves creating a flare at the end of the hard line, which provides a better surface for the rubber hose to grip onto and creates a tighter seal.
Firstly, you will need to cut the hard line using a mini tubing cutter. This will create a clean edge for the flare. Once you have cut the hard line to the desired length, you can begin to create the flare.
A bubble flare can be created using a double flare kit. To do this, simply follow the first step of creating a double flare and then only partially complete the second step. This will result in a bubble-like shape at the end of the tube, which will help to keep the rubber hose in place. It is important to note that you should debur the edge of the flare to ensure that it does not cut into the rubber hose.
After creating the bubble flare, you can slide the rubber hose over the hard line. It is recommended to use two hose clamps to secure the connection and prevent leaks. Fuel injection hose clamps are ideal as they are designed specifically for this purpose and will not dig into the rubber.
By using a hose barb and a bubble flare kit, you can securely connect a rubber fuel line to a hard line, ensuring a tight seal and preventing leaks. This method is straightforward and effective, providing a safe and reliable connection for your fuel system.
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Fittings for rubber hose
When connecting a rubber fuel line to a hard line, there are a few methods you can use. One common method is to use a push-lock fastener that matches the size of the hard line. First, flare the hard line, then use an AN nut and sleeve before mating it to the push-lock fitting. Alternatively, you can push the rubber hose onto the hard line and use two "fuel injection" clamps to secure it. It is recommended to avoid using worm gear clamps or regular screw clamps as they can cut into the rubber hose. Instead, consider using EFI hose clamps.
To create a good seal, you can flare the end of the hard line using a flaring tool and then file down any sharp edges. This will ensure a smooth connection with the rubber hose. Another option is to use a tubing-to-hose adapter, such as a barb adapter, which can be threaded onto the tubing. Hydraulic supply houses typically carry these adapters, and they can also be found at most hardware stores.
When it comes to fittings for rubber hoses, there are several options available. Tri-clamp hose adapters, for example, offer a wide range of sizes and styles, including 90-degree bends, reducing adapters, and extra-long rigid adapters with additional barbs for higher-pressure applications. These adapters can be purchased from retailers like Home Depot and Glacier Tanks.
Another type of fitting is the push-lock barb rubber hose union/coupler, which can be found from suppliers like RaceFlux. Stainless steel connection types are also available for rubber hoses, with sizes ranging from 3/8 inches to 4 inches. These fittings can be sourced from companies such as Glacier Gear and Lechler.
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Compression fittings
To use compression fittings, you will need to follow these general steps:
- Ensure that the mating steel line is rust-free. This is crucial for a long-lasting, leak-free connection.
- Prepare the compression fittings by selecting the appropriate size and type for your specific application. Compression fittings come in various sizes and are made from different materials like brass or nylon.
- Clean and prepare the rubber fuel line and the hard line to ensure a smooth connection. This may involve cutting the lines to the correct length and removing any debris or residue.
- Slip the rubber fuel line over the hard line. Make sure that the rubber line is securely seated and pushed on as far as possible.
- Secure the connection using the compression fitting. Place the fitting over the rubber line and tighten it securely, following the manufacturer's instructions.
It is important to note that while compression fittings are generally safe, some people recommend avoiding them for high-pressure applications. Additionally, it is always recommended to follow safety guidelines and seek professional advice when working with fuel lines to prevent leaks and ensure a secure connection.
Some specific examples of using compression fittings for fuel line connections include:
- Using a 5/16" brass barbed splice fitting for a hard nylon line. This method involves heating the fitting in boiling water and then installing it while warm to prevent the plastic line from cooling and shrinking too quickly.
- Employing a compression fitting with a barbed adapter. This method is useful when connecting short sections of rubber hose to a long nylon run, as it provides a secure connection that won't slip off.
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Hose clamps
There are different types of hose clamps available, and choosing the right type is crucial for a safe and effective connection. EFI (Electronic Fuel Injection) hose clamps are specifically designed for fuel systems and are highly recommended. They provide a secure hold without digging into or cutting the rubber hose. Regular screw-type clamps, also known as worm gear clamps, are not recommended for fuel line connections as they can damage the hose and may not provide a tight seal.
When using hose clamps, it is generally advisable to use two clamps for added security and to prevent leaks. This is especially important in fuel systems, where the pressure can be significant. By using two clamps, you create a more robust and reliable connection that can withstand higher pressures.
To enhance the performance of hose clamps, some preparation of the hard line is often recommended. Flaring the end of the hard line before inserting the rubber hose creates a slight ridge, providing a non-slip surface for the clamp to hold onto. This technique improves the overall security of the connection and helps prevent the hose from sliding off.
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Braided line
When connecting braided lines to hard lines, it is important to ensure that the correct fittings and clamps are used to create a secure and safe connection. Braided lines can be connected to hard lines using a combination of tube nuts, male-to-male adapters, and female AN fittings. The specific fittings required may vary depending on the vehicle and the type of fuel line being used. For example, if you are using a rubber hose, you would typically use barb fittings, while a standard AN fitting would be used for a braided hose.
It is recommended to use EFI hose clamps instead of regular screw-type clamps to secure the braided line to the hard line. This is because the EFI clamps are less likely to cut into the hose when tightened. It is also important to debur the edge of the flare to prevent any sharp edges from cutting the inside of the hose.
When working with braided lines, it is important to consider the outer diameter of the line, as it may be significantly larger than the original hard line, which can make routing more challenging. Additionally, braided lines without an inner liner may weep fuel vapour, resulting in a faint fuel smell.
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Frequently asked questions
You can slip the hose over the hard line and use two EFI hose clamps to secure it.
It is recommended to use EFI hose clamps instead of regular screw-type clamps to avoid cutting into the hose.
It is important to note that the connection between the metal line and the hose will be under high pressure, so it is crucial to ensure a tight seal to prevent leaks. One way to do this is by flaring the end of the hard line to create a slight ridge before attaching the hose.
Yes, you can use a pushlok fastener of the proper size to match the hard line. You would flare the hard line, use an AN nut and sleeve, and then mate it to the pushlock fitting.
