Mercedes Mullins
There are a variety of options for those looking to build custom fuel lines for EFI systems. The best option is generally considered to be a convoluted PTFE fuel hose, which is a Teflon®-like material that prevents static electricity discharge and offers a near-perfect vapour barrier. However, this option is expensive, and there are other more affordable options, such as Earl's Vapor Guard hose, which is a multi-layer rubber exterior hose that offers protection against aromatic additives and prevents fuel from evaporating through the hose. For those looking to make fewer connections, it is possible to run the 3/8ths vaporguard the whole way, adding some clamps and mounts.
Characteristics and Values of EFI Fuel Lines
| Characteristics | Values |
|---|---|
| Hose Material | PTFE (polytetrafluoroethylene), rubber, stainless steel, nylon |
| Hose Type | Earl's Vapor Guard, Classic Tube, Aeroquip, Gates Barricade MPI |
| Hose Size | 3/8", 5/16", 5/8" |
| Fittings | Barbed, push lock, AN fittings, inverted double flare, Earl's Vapor Guard |
| Clamps | Hose clamps, EFI hose clamps, fuel injection-rated clamps |
| Pressure Rating | 225 psi, 50 psi, 300 psi, 100 psi |
| Tools | Double flare tool, brake flaring tool |
| Fuel System Components | Fuel injectors, fuel rails, fuel pressure regulator, fuel filter |
| Fuel Pump | Walbro GSL392, Aeromotive, VaporWorx |
| Fuel Tank | Spectra Premium F28DFI, Fragola |
| Adapter | AN-6 Male to AN-6 Female, GM-style clip fittings |
| Fuel Injection System | Sniper EFI, Holley Sniper EFI |
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What You'll Learn
Using Earl's Vapor Guard hose and fittings
Earl's Vapor Guard EFI Fuel Hose is an excellent choice for your fuel line as it is the best EFI fuel hose on the market today. It is also more affordable than other options. The hose is made of a multi-layer rubber exterior that offers protection against all the aromatic additives and a vapour barrier that prevents fuel from evaporating through the hose. It is designed to withstand 225 psi maximum fuel pressure and is available in 5/16” and 3/8” sizes. It is important to note that the Vapor Guard hose must be used with Vapor Guard hose ends and clamps.
Earl's Vapor Guard hose is available in 10- and 20-foot rolls. If you need a longer single piece of hose, you can contact the manufacturer. The hose is easy to assemble at home with common tools. The fittings are simple slip-on barbed pieces that use an upscale hose clamp to seal. The fittings are specific to the Vapor Guard hose and are significantly less expensive than other options.
If you are upgrading an older vehicle to fuel injection, you will need to learn how to make the fuel system work. You will need a high-pressure pump and quite possibly an entirely new fuel system to deal with the higher fuel pressures. You will also need to add fuel filters and a fuel return line. A vehicle manufacturer usually uses a hard metal line to run from the back of a 4x4 (where the tank usually is) to the front of the 4x4 (where the engine usually is). You can use the factory hard metal line as the return line and build a high-pressure feed line to feed the system.
When plumbing your vehicle, always keep the fuel hose away from heat sources, sharp edges, and moving components. Always allow enough slack for powertrain movement and check for clearance from suspension and drivetrain components. Be sure to check the full range of travel on suspension parts to avoid pinching or stretching the fuel hose.
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Using braided stainless lines
Braided stainless steel lines are a popular choice for EFI fuel lines. They are often used in race cars and are compatible with a variety of fuels, including E85, gasoline, and methanol. The stainless steel outer braid provides impact and abrasion resistance, protecting the inner liner. This type of fuel line is ideal for applications where a fuel line needs to be routed through tight spaces, as it is smaller in diameter compared to a rubber braided line. It also offers outstanding flow capacity and extended service life.
When choosing a braided stainless steel fuel line, it is important to consider the inner liner material. PTFE (polytetrafluoroethylene) is a popular choice for the inner liner as it is specially carbonized for conductivity, which is critical for fuel handling. It also provides excellent flexibility and durability. However, PTFE-lined fuel lines tend to be more expensive than rubber-lined options.
Another option for the inner liner is a multi-layer rubber hose, such as the Earl's Vapor Guard hose. This hose offers protection against aromatic additives and features a vapor barrier that prevents fuel evaporation. It is a more affordable option compared to PTFE-lined hoses, and the fittings are simple to install using slip-on barbed pieces and hose clamps. However, it may not weather extreme heat or long-term use as well as PTFE-style hoses.
When installing a braided stainless steel fuel line, it is important to follow the manufacturer's instructions and use the correct fittings and clamps. For example, the Vapor Guard hose must be used with Vapor Guard hose ends and clamps to avoid damaging the inner liner. Additionally, it is worth noting that braided stainless steel fuel lines may be more expensive than other options, such as aluminium or rubber fuel lines.
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Using a factory fuel line for the return
When it comes to making EFI fuel lines, one option to consider is using a factory fuel line for the return. This approach can offer several advantages in terms of simplicity and functionality.
Firstly, using a factory fuel line for the return can help reduce the complexity of the fuel line setup. As mentioned by a user, the return line typically has relatively low pressure since it is returning unused fuel from the engine back to the tank. This means that there is less need for specialized high-pressure components, and you can utilize the factory line with some EFI-rated hose and clamps to get the job done. This approach can save you the trouble of routing and bending lines, resulting in a tidier installation.
The specific size of the factory fuel line you use will depend on the engine and its requirements. For instance, a 5/16-inch hose is generally suitable for a four-cylinder engine, while a 3/8-inch line might be preferable for higher horsepower applications. It's important to ensure that the factory line you choose is compatible with the fuel pressure and flow rate requirements of your specific setup.
When using a factory fuel line for the return, it's crucial to ensure that the line is properly sealed and secured. This typically involves using appropriate fittings and clamps designed for EFI applications. For example, Earl's Vapor Guard hose and clamps are often recommended for their compatibility with EFI systems and their ability to handle fuel pressure and vapors effectively.
Additionally, it's worth noting that the factory fuel line may have been designed with different fuel types or operating conditions in mind. As such, it's important to verify that the factory line is compatible with the specific fuel and additives you plan to use. This includes considering the temperature and pressure ratings of the factory line to ensure it can safely handle the operating conditions of your EFI system.
By following these considerations and choosing the right components, you can effectively utilize a factory fuel line for the return in your EFI setup, simplifying your fuel line installation while ensuring proper functionality and safety.
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Using a fuel pressure gauge
When making your own EFI fuel lines, you may want to use a fuel pressure gauge to ensure the system is working as it should.
First, you'll need to purchase a fuel pressure gauge. You can find these online and at auto parts stores. Make sure to get one that fits your specific vehicle and fuel system. The pressure gauge should come with an adapter that will allow you to connect it to your fuel line.
Next, you'll need to find the correct location to install the gauge. The proper location is on the feed line before the fuel rail. This is usually on the driver's side of the car, where the fuel line runs through the fuel filter. You'll need to screw the adapter onto the end of the fuel pressure regulator. It's important to get this location right, as placing the gauge after the distributor will only show the pressure of the fuel returning to the tank, which is significantly lower than the pressure in the feed line.
Once you've found the correct location, you can install the gauge by screwing it into the adapter. Make sure it's tight and secure. Now you can start the engine and observe the gauge to ensure the fuel pressure is within the correct range for your vehicle.
Finally, you can refer to online resources, such as YouTube videos and blog posts, for visual guides on installing and using a fuel pressure gauge. These can provide additional clarity and ensure you're taking the proper steps for your specific vehicle and fuel system.
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Using a stock stainless tube and PTFE flexible ends
The first step in making EFI fuel lines is to decide on the type of materials and fittings you want to use. For the fuel lines, you can choose between using a stock stainless tube or a braided stainless line. While the stock stainless tube offers a clean and tidy look, the braided stainless line provides more flexibility and resistance to impact and abrasion.
If you opt for the stock stainless tube, you will need to purchase PTFE flexible ends separately. PTFE, or polytetrafluoroethylene, is a Teflon-like material that is often recommended for EFI applications, especially if you are contemplating using E-85 fuel. It is important to ensure that the PTFE liner is specially carbonized for conductivity, which is critical for fuel handling and prevents static electricity discharge.
When installing the PTFE flexible ends onto the stock stainless tube, you will need to follow the manufacturer's instructions carefully. Typically, this involves using a sharp razor knife to trim the PTFE liner to the appropriate length, installing the ferrule over the liner, and then securing the fitting into the socket and tightening it securely.
It is worth noting that creating your own EFI fuel lines using a stock stainless tube and PTFE flexible ends may require some prior knowledge and experience. If you are unsure or uncomfortable with the process, it is always recommended to seek professional assistance or advice.
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Frequently asked questions
The best EFI fuel line depends on your budget. Earl's offers a convoluted PTFE fuel hose, which is a Teflon-like material with carbon added to make it conductive. This is the same material used in all new OE production cars and offers a perfect vapor barrier. A more affordable option is Earl's Vapor Guard hose, which is a multi-layer rubber exterior hose that can withstand 225 psi maximum fuel pressure.
The size of the EFI fuel line you need depends on the engine. For a four-cylinder engine, a 5/16-inch hose is typically sufficient, while a high-horsepower V-8 engine will require a larger 5/8-inch line. If you're using a stock engine, a 5/16-inch line should be okay, but for more horsepower, a 3/8-inch line will work better.
Yes, you can use the factory fuel line for EFI, but you may need to make some modifications. If your vehicle previously had a carburetor, you can use the factory hard metal line as the return line and build a high-pressure feed line. You may also need to replace any rubber lines with a larger diameter line, such as Holley's VaporGuard line.
To make an EFI fuel line, you will need a double flare tool and bendable lengths of hard metal line. You will also need flare couplers, fittings, and clamps to connect the hard metal line to the fuel tank and engine. If you're using a braided hose, you may need to attach support clips.
