Rajan Wilcox
Building a custom fuel line for a fuel injector hose is a complex task that requires careful planning and execution. It involves the use of various tools and materials, such as metal lines, rubber hoses, clamps, and fittings. The process can be challenging, especially for those without experience in running lines for high-pressure injection systems. There are several options for the type of hose to use, each with its own advantages and disadvantages in terms of cost, durability, and ease of use.
Characteristics and Values of Building a Fuel Injector Hose
| Characteristics | Values |
|---|---|
| Hose Material | PTFE (Teflon-like material), Nylon, Stainless Steel, Rubber |
| Hose Type | Braided, Non-braided |
| Hose Fittings | Metal, Barbed, Push Lock, Crimp, AN, EFI |
| Hose Size | 3/8-inch, 5/16-inch, 5/8-inch |
| Hose Pressure Rating | 300 PSI, 40 PSI, 60-70 PSI |
| Hose Manufacturers | Holley Earl, TechAFX, EVIL ENERGY |
| Hose Maintenance | Regular cleaning, Leak prevention, Compatibility with fittings |
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What You'll Learn
Using a braided hose
Braided hose is a popular choice for building a custom fuel injector hose. It is a durable option that can withstand high pressure and temperatures. Braided hose is generally rated over 300 psi and up to 350 psi for nylon or 1,000 psi for stainless steel, using matching fittings. Braided hose can also be used for other high-pressure fluid systems like transmission coolant lines or power steering return lines.
When using a braided hose, it is important to ensure that the fittings and hose diameters are compatible to avoid leaks. The hose must be cut to the appropriate length, and the ends must be secured with fittings. This can be challenging, as the braided material can be difficult to work with and may require trimming or wrapping with tape before cutting. It is also important to consider the type of fittings required for the braided hose, such as specific fittings that use a ferrule to seal to the fitting.
One user reported success with a braided hose and EFI-style clamps on their 924, with no leaks. They reused the fittings and cut the band off before assembling the braided hose. They also noted that return lines work well since they are under little pressure. Another user inquired about the difficulty of getting the ends of a stainless steel braided hose into the end of the nut for an AN fitting, as it required a lot of force and trimming the hose.
It is important to note that braided hose can be more expensive than other options, with a 20-foot length of braided hose costing over $180. However, it is expected to last the lifetime of the vehicle unless physically damaged. Braided hose is also commonly used for appearance, as it has a distinctive look with bright stainless steel and colourful anodized aluminium AN fittings.
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Trimming the liner
Firstly, it is important to understand the components involved. The PTFE (polytetrafluoroethylene) liner is a Teflon-like material that forms the inner layer of the fuel hose. It is impregnated with carbon, giving it a darker colour and making it conductive to prevent static electricity discharge. On the other hand, the ferrule is a small, circular component that secures the liner in place.
When trimming the liner, always refer to the manufacturer's instructions. In the case of the Holley Earl's UltraPro fuel line, the instructions specify using a sharp razor knife. This ensures a clean and precise cut. Attempting to trim the liner with a dull knife can result in an uneven cut and may even damage the liner.
Before trimming, mark the portion of the liner that needs to be cut. This will guide you in achieving an accurate trim. Carefully align the knife with the mark and apply gentle pressure to cut through the liner. Take your time and avoid rushing this step to prevent any accidental slips or cuts.
Once the liner is trimmed, inspect the cut to ensure it is straight and even. Any unevenness or rough edges can create issues when installing the fitting. If necessary, use a fine-grit sandpaper to smooth out any imperfections gently. Remember, the goal is to achieve a flush fit between the liner and the ferrule.
Finally, it is crucial to handle the trimmed liner with care. The edges of the liner can be sharp, so wear protective gloves when handling the trimmed hose to prevent any injuries. Additionally, ensure that any debris or residue from the trimming process is cleaned up properly to avoid any contamination in the fuel system.
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Metal lines
When constructing metal lines for fuel injection systems, it is essential to consider the engine configuration and fuel pressure requirements. For instance, a 5/16-inch hose and metal lines are generally suitable for four-cylinder engines, while a 3/8-inch fuel line is recommended for most V-6, I-6, and V-8 engines.
The process of creating hard metal lines involves using a double flare tool and bendable lengths of hard metal line. Double flare couplers are then employed to transition to AN fittings and inverted double flare. To connect with flexible lines, barbed fittings, push lock fittings, or specialized fittings like Earl's Vapor Guard fittings may be utilized.
It is worth noting that metal lines can be challenging to fabricate. Ensuring proper sizing and compatibility between fittings and hoses is crucial to prevent leaks. Additionally, the use of fuel line clamps or compression fittings may be necessary for secure connections.
For those seeking a more economical option, nylon tubing can be a viable alternative to plain rubber fuel hose. Braided hose, which combines rubber with a braided stainless or nylon exterior, offers enhanced durability. However, it is important to note that rubber hose tends to degrade over time and may not be suitable for plumbing an entire fuel system.
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Flexible hose systems
When it comes to flexible hose systems for fuel injectors, there are a few options to consider. The first is the type of hose used. Hoses can be made from a variety of materials, including rubber, PTFE (polytetrafluoroethylene), and nylon or stainless steel with an outer weaving. It's important to choose a hose that is compatible with the type of fuel and additives used, such as ethanol, gasoline, diesel, or methanol. For example, SAE 30R9 hose is designed for use with EFI systems and can handle all types of fuel, including ethanol blends.
Another consideration is the pressure rating of the hose. Hoses have different working pressure ratings, typically ranging from 50 PSI to over 100 PSI. It's important to choose a hose that can withstand the pressure of your fuel injection system. For instance, the push-to-lock hose and fittings are designed to withstand higher pressures of around 300 PSI.
The fittings and connections are also an important factor. Fittings can include barbed fittings, push lock fittings, or inverted double flare couplers. It's important to note that metal fittings need to be paired with a hose from the same manufacturer to ensure a secure connection. Clamps are also necessary to secure the fuel lines, and it's recommended to use clamps specifically designed for fuel injection systems, as they provide uniform pressure and won't damage the hose.
The length of the hose is another consideration. It's important to avoid using long lengths of hose as they tend to kink and cut off fuel flow. Instead, opt for shorter hoses and use flexible connections between metal lines to ensure a leak-proof system. Additionally, the bend radius of the hose should be considered, especially when using stiffer materials like PTFE, as they require a larger bend radius.
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Hose and fitting compatibility
When it comes to hose and fitting compatibility, there are several factors to consider. Firstly, it is important to choose the right type of hose for your specific application. For fuel injection systems, a high-pressure hose is typically required to withstand the higher fuel pressures. The hose should also be made of a compatible material that can handle the fuel and additives without degradation.
One popular option for fuel injection hoses is the PTFE (polytetrafluoroethylene) hose, which is a Teflon®-like material. PTFE hoses are available in both convoluted and non-convoluted designs. The convoluted version has a carbon-impregnated inner liner, which makes it conductive and eliminates the risk of static electricity discharge. This type of hose is commonly used in OE production cars as it is compatible with all types of fuel and additives. It also offers an excellent vapour barrier, preventing fuel evaporation through the hose. However, PTFE hoses can be quite expensive.
Another option is a multi-layer rubber hose, such as the Earl's Vapor Guard hose. This hose provides protection against aromatic additives and also features a vapour barrier to prevent fuel evaporation. Rubber hoses are typically more affordable than PTFE hoses.
When selecting fittings for your hose, it is important to ensure compatibility. Fittings are available in various materials, including metal, nylon, and stainless steel. Metal fittings, such as those made of brass or aluminium, are commonly used and must be paired with a hose from the same manufacturer to ensure a secure connection. For example, push lock fittings can be used with rubber hoses to help them withstand higher pressures, but they should not be used on power steering feed lines.
Additionally, the size and shape of the fittings must match the hose. Fittings come in different sizes, such as -6 AN or -8 AN, and should be selected based on the inner diameter of the hose. For example, a 3/8-inch fuel line typically requires a -6 AN fitting. Some fittings also have specific features, such as a 90-degree angle, that must be considered when making your selection.
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Frequently asked questions
The best type of hose to use for a fuel injector is a convoluted PTFE (polytetrafluoroethylene) fuel hose. This is because the material is conductive, which prevents static electricity discharge. It is also impervious to all fuels and additives and offers a near-perfect vapour barrier.
A much more affordable option for a fuel injector hose is the Earl's Vapor Guard Hose. This is a multi-layer rubber exterior hose that offers protection against all the aromatic additives as well as a vapour barrier that prevents fuel from evaporating through the hose.
Other options for fuel injector hoses include the EVIL ENERGY LS Swap Fuel Kit, which has excellent reviews, and the push-to-lock hose and fittings, which can withstand high pressures.
