Sylvie Willis
The size of a fuel line is important when considering the horsepower of a vehicle. A fuel line that is too small will not be able to support the horsepower goal, while a line that is too big will take longer to pressurize and can cause engine damage. The type of fuel used is also a factor, as ethanol and methanol require larger fuel lines than gasoline to generate the same horsepower. For 800 horsepower to the wheels, a 3/8 steel line can be used, and a 1/2 line is recommended by some manufacturers. A dynamic fuel system with a bypass pressure regulator and a return line to the tank is also suggested for high-HP cars.
Fuel Line Sizing for 800 Horsepower
| Characteristics | Values |
|---|---|
| Fuel Line Diameter | 3/8" or larger |
| Pump | Sufficiently powerful to support fuel demand |
| Fuel Type | Gasoline, Ethanol, or Methanol |
| Fuel Pressure | Consider pressure drop through bends and fittings |
| Fuel Consumption | Approximately 0.5 lbs/hr/hp |
| Fuel System | Dynamic system with bypass regulator and return line |
| Fuel Line Material | Steel or Stainless Steel |
| Fittings | Avoid 90-degree fittings; swept 90 is acceptable |
| Fuel Filter | Recommended: 100 Micron In-Line Filter |
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What You'll Learn
Fuel line sizing depends on the fuel type
Ethanol will require about 30% more fuel than gasoline to generate the same HP. Methanol will require double the amount of fuel. When designing a fuel line system for these fuels, go one or two sizes larger than the gasoline requirement. The return lines, which are the fuel lines after the regulator, can generally be one size smaller than the feed line.
For a typical fuel system, when all is sized right, a good number to see when all is clean is between 1/4″ & 3″ of Hg total fuel restriction, with about 1.0 to 2″ Hg most common in a well-designed fuel system.
Additionally, port injected EFI systems run at 5-10 times higher pressure and therefore can get away with smaller fuel lines.
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Fuel line diameter is important
On the other hand, if the diameter is too large, the lines will take longer to pressurize. If the pump cannot maintain the pressure, it may drop during times of high demand, leading to potential engine damage. The correct diameter is, therefore, the best choice. Many in-line fuel pump manufacturers recommend a fuel line diameter that works optimally with their pumps. This is to prevent starving the pump and is not necessarily the size of the outlet line.
The type of fuel used also plays a role in determining the required fuel line diameter. Ethanol requires about 30% more fuel than gasoline to generate the same horsepower, while methanol requires double the amount of fuel. When designing a fuel line system for these types of fuel, it is recommended to go one to two sizes larger than the gasoline requirement.
Additionally, the type of fuel delivery system, such as carburetor or fuel injection, also impacts the optimal fuel line diameter. Carburetor systems typically require larger diameters due to lower pressure, while fuel injection systems operate at higher pressures and can, therefore, utilize smaller fuel lines. It is important to note that the shape and length of the fuel line, as well as the number and type of fittings, can also impact the overall performance and should be considered when designing a fuel system.
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The pump is a key component
The size and type of fuel pump can vary depending on the engine and fuel system design. In modern direct-injection engines, the pump operates at a much higher pressure, up to 30,000 psi, and may be part of an assembly that includes a fuel strainer and fuel level sensor. In fuel-injected engines, an electric fuel pump is typically located inside the fuel tank, submerged in the fuel. This placement serves multiple purposes: it cools the pump, reduces the risk of fire, and helps prevent the pump from overheating. Additionally, by positioning the pump inside the tank, the risk of sparks igniting fuel vapours is minimised.
The importance of the pump in a fuel system cannot be overstated. A properly sized and functioning pump ensures the smooth operation of the engine. If the pump is too small, the line size becomes irrelevant, and the pump will have to work harder. This can lead to decreased efficiency and potential damage to the pump. Therefore, it is crucial to select a pump that meets the manufacturer's requirements for pressure and volume to ensure optimal vehicle performance and emissions.
Furthermore, the pump plays a critical role in maintaining fuel cleanliness. Fuel filters work in conjunction with the pump to ensure that contaminants such as rust, dirt, and debris are removed before the fuel enters the engine. If the filter becomes clogged, the pump must work harder to push the fuel through, which can lead to increased strain and potential damage. Regular maintenance and replacement of fuel filters are essential to maintaining the health of the pump and the overall fuel system.
In summary, the pump is a vital component in a fuel system, responsible for generating volume and pressure, ensuring fuel delivery, and maintaining fuel cleanliness. Its proper sizing and maintenance are crucial to the overall performance, efficiency, and longevity of the engine.
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The engine's demands must be met
The inner diameter of the fuel line is a key factor. A larger diameter generally provides more flow, but it is essential to select the correct size. For example, a 3/8" inner diameter fuel line is commonly used and can support up to 600 horsepower with sufficient "pump head". Increasing the pump size can further enhance performance, allowing a 3/8" steel line to support up to 1000 horsepower.
Additionally, the type of fuel and its properties play a role in fuel line sizing. Alcohol, for instance, reduces surface tension and allows for better flow compared to water. The specific fuel consumption, typically around 0.5 pounds of fuel per horsepower, is another factor to consider when sizing the fuel line.
The layout of the fuel line can also impact performance. A straight pipe generally results in less pressure drop compared to elbows or 45-degree bends. It is essential to consider the total length of the fuel line, taking into account the bends required to reach from the gasoline tank to the engine fuel rail.
Finally, the fuel pump plays a critical role in meeting the engine's demands. A larger, more powerful in-tank pump can be more effective than an inline pump. Additionally, ensuring that the pump has a sufficient "pump head" is vital, as insufficient "pump head" can lead to pressure drop issues, especially in longer fuel lines.
In summary, meeting the engine's demands requires careful consideration of fuel line diameter, fuel type, fuel consumption, line layout, and fuel pump specifications. By optimizing these factors, you can achieve the desired performance, ensuring that the engine receives the required fuel flow to meet its 800 horsepower goal.
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A dynamic fuel system is better for high HP cars
A dynamic fuel system is better for high-HP cars because it improves the average float level, fueling the bowls more quickly and consistently. This system combines the right pump and regulator, resulting in a noticeable increase in pump-to-horsepower ratings, allowing smaller, lighter pumps to fuel more HP. It also increases pump life and makes pump operation quieter.
The dynamic system uses a "bypass" fuel pressure regulator with a return line back to the tank, which is easier on the fuel pump as it avoids the pressure waves caused by a static system. With a dynamic system, the pump moves more volume than the engine can use, even at full throttle at the red line RPM. This means that the G-force of the launch of the starting line must be overcome by the fuel pump via the fuel feed lines.
A dynamic system is also beneficial as it saves fuel by only using the cylinders of an engine that are required during a specific driving situation, such as highway cruising. It then reactivates the other cylinders when more power is needed for acceleration or climbing. This is achieved through an electromechanical system that controls valve actuation.
While a dynamic fuel system is ideal for high-HP cars, it is important to note that the size of the fuel line also matters. A 3/8" ID fuel line can support up to 600 HP, and with a big enough pump, it could even support 1000 HP. However, for 800 HP, a 10AN fuel line (equivalent to 5/8") is recommended for both the feed and return.
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Frequently asked questions
A 1/2" fuel line should be sufficient for 800 horsepower. A 3/8" fuel line can support 600 HP with sufficient "pump head".
A larger diameter is generally better, but the correct diameter is the best choice. If the diameter is too small, you won't be able to support your horsepower goal. If it's too big, the lines will take longer to pressurize.
A dynamic fuel system is best for high horsepower. This means using a "bypass" fuel pressure regulator with a return line back to the tank. This setup reduces pressure on the fuel pump.
Carburetor systems use larger fuel lines due to lower pressure. EFI systems run at higher pressure and can use smaller fuel lines.
The type of fuel used is an important factor. For example, ethanol requires 30% more fuel than gasoline, and methanol requires double the amount.
