Regan Brown
When it comes to fuel lines for EFI, there are a few things to consider. Firstly, it is recommended to use hard lines made of steel or nylon wherever possible, with flexible lines only being used for connections where movement or vibration is a factor. It is also important to use an EFI-specific fuel tank and to ensure that the fuel lines are isolated from the passenger compartment. Some people opt for braided lines, while others use a combination of hard and flexible lines. The type of fuel line used will depend on the specific vehicle and its engine, as well as personal preferences and budget.
| Characteristics | Values |
|---|---|
| Material | Steel, nylon, braided, Cunifer (nickel copper) |
| Type | Hard lines, flexible lines |
| Fittings | Aeroquip aluminium black anodized -06AN |
| Hose | Gates Barricade MPI fuel line |
| Fuel tank | Aeromotive, Spectra Premium F28DFI 22 gal tank |
| Fuel pump | Axial pump |
| Fuel line size | 3/8" supply and return, 5/16" return, 1/4" return line |
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What You'll Learn
Braided lines front to back with fittings
When using braided lines, it is important to secure them to the chassis with hard lines made of steel or nylon wherever possible. Flexible lines should only be used for connections where movement or vibration is a factor, such as between the chassis and engine. It is also important to use an EFI-specific fuel tank, ensuring that the fuel lines are isolated from the passenger compartment.
For the fittings, Aeroquip aluminum black anodized -06AN fittings are a good option, as mentioned by a user on a Mustang forum. These fittings are designed to work with braided lines and provide a secure connection. Another user on the same forum mentioned using an axial pump, which is a more reliable option than a cheap piston or diaphragm unit.
When it comes to the fuel line hose, Gates Barricade MPI fuel line hose is a recommended option. This hose is designed to withstand the high pressures and temperatures associated with EFI systems. It is important to use a fuel line hose that is compatible with the fuel type being used, as well as the specific requirements of the EFI system.
Overall, braided lines front to back with fittings is a viable option for fuel lines on EFI. With the right fittings and hose, this setup can provide a secure and reliable fuel delivery system.
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Using Cunifer (nickel copper) line
Cunifer (nickel copper) line is a good option for fuel lines on EFI. It is an all-metal line that is much easier to form than other options. Cunifer line is a good choice if you need to replace or install a return line with a larger-than-stock size.
When it comes to fuel lines for EFI conversion, it is recommended to use hard lines secured to the chassis wherever possible. Steel or nylon lines are ideal for this. Flexible lines should only be used for connections where movement or vibration is a factor, such as between the chassis and engine, or where it facilitates the removal or installation of components like the filter housing, pump, or sender.
It is important to use an EFI-specific fuel tank and ensure that the fuel lines are isolated from the passenger compartment. Pre-filters between the tank and pump are not recommended. Instead, a decent "sock" on the inlet of a new tank should suffice. Additionally, an axial pump is preferred over a cheap piston or diaphragm unit.
For the engine compartment end, some people cut the flare off the line and use an Earls clamp-on conversion to an AN-6 line. This is then run through a fuel cooler and a secondary filter before reaching the pressure gauge and the front of the EFI.
Finally, it is worth noting that rubber lines should be replaced with Holley's VaporGuard line, as the stock return fuel line has a too-small diameter. This can also be addressed by using a fuel pump that doesn't require a return or by installing Holley's filter/pressure regulator near the tank with a short return.
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Using Earls clamp on conversion to and AN-6 line
Using an Earl's clamp-on conversion to an AN-6 line is a great way to ensure your fuel lines are secure. This method involves cutting the flare off the line at the engine compartment end and then clamping on the AN-6 line. This line is then run through a fuel cooler and a secondary filter before connecting to the pressure gauge and ultimately, the front of the EFI.
Earl's clamp-on conversion offers a secure and reliable connection for your fuel lines. It is important to note that hard lines, such as steel or nylon, are generally preferred for fuel lines, with flexible lines reserved for connections where movement or vibration is a factor. Additionally, it is recommended to use an EFI-specific fuel tank and ensure the fuel lines are isolated from the passenger compartment.
When it comes to the fuel line material, braided lines are an option, although they may be more expensive and challenging to work with. Another consideration is the use of a fuel pump that doesn't require a return line, or alternatively, employing a filter/pressure regulator near the tank with a short return.
It is worth noting that the stock return fuel line may have a smaller diameter than what is recommended by manufacturers. In such cases, it is advisable to replace or install a larger return line. For example, Holley recommends a 3/8 supply line and a 5/16 return, while Corvettes use a 1/4" return line.
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Replacing rubber lines with Holley's VaporGuard line
When it comes to fuel lines for EFI, there are a few options to consider. It is recommended to use hard lines, such as steel or nylon, wherever possible, with flexible lines only used for connections where movement or vibration is a factor. For example, between the chassis and engine or where it facilitates the removal or installation of components like the filter housing, pump, or sender.
If you're looking to replace rubber lines, Holley's VaporGuard line is a great option. The stock return fuel line may have a smaller diameter, but this can be addressed by using a fuel pump that doesn't require a return or by installing Holley's filter/pressure regulator near the tank and doing a short return. This ensures that your fuel lines are properly sized and functioning optimally.
When it comes to fittings, braided lines are an option, although they may be more expensive and challenging to work with. Some users opt for Spectra Premium F28DFI 22-gallon tanks with 3/8" feed and return NiCopp hard lines, along with Aeroquip aluminium black anodized -06AN fittings. Gates Barricade MPI fuel line hose is another choice at the tank sender/pump, fuel filter, and EFI unit.
Additionally, it's important to consider the size of your supply and return lines. Holley recommends a 3/8 supply line and 5/16 return, while Corvettes use a 1/4" return line. You may need to replace or install a larger-than-stock-size return line, and Cunifer (nickel copper) line is a suitable option for this purpose as it's still all metal but easier to form.
Finally, when working with the engine compartment, you can cut the flare off the line and use an Earls clamp-on conversion to an AN-6 line. Running it through a fuel cooler and a secondary filter before it reaches the pressure gauge is also recommended.
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Using hard lines secured to the chassis
When using hard lines, it is important to ensure that the fuel lines are isolated from the passenger compartment. This can be achieved by using an EFI-specific fuel tank. Additionally, it is advised not to install a "pre-filter" between the tank and pump. If a decent "sock" has been used on the inlet of a new tank, an axial pump can be utilised instead of a cheap piston or diaphragm unit.
Some users have reported success with braided lines, although this option may be more expensive and challenging to work with. For example, one user combined braided lines with a Spectra Premium F28DFI 22-gallon tank, 3/8" feed and return NiCopp hard line, and Aeroquip aluminium black anodized -06AN fittings.
Another consideration when using hard lines is the size of the supply and return lines. Holley, for instance, recommends a 3/8 supply line and a 5/16 return line, while Corvettes typically use a 1/4" return line. It is also worth noting that the stock return fuel line may have a smaller diameter than required, so it may need to be replaced or upgraded. Cunifer (nickel copper) line is a suitable option for this, offering the strength of metal while being easier to form.
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Frequently asked questions
Steel or nylon hard lines are the best option, with flexible lines only used for connections where movement or vibration is a factor.
Holley recommends a 3/8 supply line and 5/16 return. Corvettes have a 1/4" return line.
Braided lines are a good option, but may be too expensive or too hard to work with. Cunifer (nickel copper) is another option as it is all metal but easier to form.
Yes, the stock return fuel line is too small in diameter, so you will need to replace it with Holley's VaporGuard line.
