Sylvie Willis
The fuel line size depends on the type of car and its engine. The fuel line is an extension of the fuel tank, and its size is important to ensure efficient fuel flow. A fuel line that is too small may restrict fuel flow, while one that is too large may be an unnecessary expense. For example, most production cars have an 8mm push-on hose, while older, smaller-engined cars with carburettors may have a 6mm hose. Larger-engined cars can use a 10mm hose, and fuel-injected cars may require a 12mm or 15mm hose from the tank to the pump. The type of fuel also impacts the required fuel line size, with ethanol and methanol requiring 30% and 100% more fuel, respectively, than gasoline to generate the same horsepower.
| Characteristics | Values |
|---|---|
| Fuel line size | 3/8", 1/2", 6mm, 8mm, 10mm, 12mm, 15mm |
| Fuel type | Gasoline, alcohol, E85 |
| Fuel pump location | Inside the tank for injected cars, outside for carburettors and some injection cars |
| Fuel tank material | Steel, plastic, alloy |
| Fuel system components | Fuel tank, Fuel pump, Fuel filter, Fuel line, Swirl pot, Carburetor, Fuel rail |
| Fuel line fittings | Push-on, screw-on, JIC/AN fittings |
| Fuel sampling kit | Required for rallying cars, can be push-on hose types or threaded male/male or female |
| Fuel line diameter | Recommended by in-line fuel pump manufacturers, larger diameter for ethanol and methanol |
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What You'll Learn
Fuel line sizing
The relationship between fuel line size and fuel pressure is a critical factor to understand when planning a fuel delivery system. A longer fuel line will result in a greater pressure loss, and the fuel flow rate will also be affected. Additionally, the type of fuel being used must be taken into account. For example, ethanol requires 30% more fuel than gasoline to generate the same horsepower, and methanol will require double the amount. As such, the fuel line diameter for these alternative fuels should be one to two sizes larger than the gasoline requirement.
It is also important to consider the recommendations of the in-line fuel pump manufacturers, as they often specify a fuel line diameter that works best with their pumps to prevent starving the pump. The return lines, which are the fuel lines after the regulator, can generally be one size smaller than the feed line.
When selecting a fuel line, it is crucial to ensure that the fittings seal properly. A larger fuel line is acceptable as long as the fittings seal correctly. However, a smaller fuel line may restrict fuel flow and impact the engine's performance, especially at full throttle.
In summary, determining the appropriate fuel line size involves considering factors such as fuel pressure, fuel flow rate, engine performance, and the recommendations of fuel pump manufacturers. By carefully selecting the fuel line diameter and length, a fuel delivery system can be optimized for efficient and effective performance.
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Fuel pump manufacturers' recommendations
Fuel pump manufacturers typically recommend a fuel line diameter that is compatible with their pumps to prevent the pump from starving. This recommended diameter may differ from the size of the outlet line. A larger diameter is generally preferable, but choosing the correct diameter is crucial. An excessively small diameter may hinder your horsepower goal, whereas an overly large diameter will result in longer pressurization times and potential engine damage if the pump cannot maintain the pressure.
Manufacturers' recommendations are particularly important when using ethanol or methanol as fuel. Ethanol requires approximately 30% more fuel than gasoline to generate the same horsepower, so manufacturers may advise increasing the fuel line size by one for ethanol fuel systems. Methanol demands twice the amount of fuel compared to gasoline, so manufacturers may suggest increasing the fuel line size by two for methanol fuel systems.
It is worth noting that return lines, which are the fuel lines after the regulator, can typically be one size smaller than the feed line. When designing a fuel system, it is essential to consider the fuel type and the specific recommendations of the fuel pump manufacturer to ensure optimal performance and avoid potential issues.
To determine the appropriate fuel pump size, it is necessary to consider the flow rate, which refers to the amount of fuel a pump can supply over time. Flow rate is usually measured in gallons per hour (gph) or liters per hour (lph). The minimum flow rate requirements can be calculated by multiplying peak horsepower by BSFC (Brake Specific Fuel Consumption). Additionally, fuel pump manufacturers provide curve charts that illustrate the flow rate at different pressures. These charts help users understand the relationship between voltage and flow rate, as well as amp draw and pressure.
By considering the fuel type, following manufacturer recommendations, and understanding the flow rate requirements, users can make informed decisions about fuel line diameter and fuel pump sizing to ensure their fuel system functions effectively and safely.
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Fuel tank replacement
Step 1: Identify the Problem
The first sign of a fuel tank issue is often puddles of fuel around your car after it has been parked, or higher-than-normal fuel consumption. Inspect the tank to visually confirm any leaks or drips.
Step 2: Prepare the Necessary Tools and Safety Equipment
Before beginning the replacement process, ensure you have the required tools and safety equipment. You will need car jacks, a spanner set, a wrench set, hose clamps, and a fuel can. Additionally, work in a well-ventilated area and keep a Class B fire extinguisher nearby as fuel is involved.
Step 3: Disconnect and Remove the Old Fuel Tank
Start by disconnecting any accessible components, such as fuel pump wiring and hoses, from above. This will improve visibility and access. Slowly lower the tank using a floor jack and continue to disconnect components as they become accessible. Be cautious when dealing with the tank strap bolts, as they may be rusty and difficult to remove.
Step 4: Install the New Fuel Tank
Once the old tank is removed, put the new tank into place. Attach it to the car using the metal straps and bolts from the previous tank. Ensure that all lines are properly connected and secured before filling the car with the appropriate fuel.
Step 5: Final Inspection
After refuelling, inspect the new tank thoroughly for any signs of drips or leaks around the pipes and lines. Ensure that there are no issues before operating the vehicle.
It is important to note that these steps provide a general guide, and specific procedures may vary depending on the vehicle's make and model. Always refer to the manufacturer's instructions or seek professional advice if you are unsure about any part of the replacement process.
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Fuel system plumbing
Planning and Diagramming
Start by creating a simple diagram of where you intend to mount the various components of your fuel system. This visual aid will help you identify any potential issues before you begin and ensure that all the necessary parts are included. It is also important to determine the type of fittings required, as most production cars use push-on hoses, with 8mm bore being the most common size.
Choosing the Right Hose
The hose is the vital link that joins all the components of the fuel system together. It is important to select a hose that suits your system's pressure requirements and can be used both inside and outside the car. Teflon or PTFE-lined hoses are ideal as they prevent the escape of fuel vapour, eliminating stale fuel smells inside the car. These hoses are typically supplied with an outer stainless-steel over-braid and come in dash 6 (-6) or dash 8 (-8) sizes, relating to the hose bore and fitting thread.
Thread Types and Sizes
The threads found in fuel systems are typically Metric, JIC/AN, NPTF, or BSP. The most common sizes used in fuel systems are AN6 / Dash 6 / -6 and AN8 / Dash 8 / -8. These sizes correspond to specific thread measurements and hose bore sizes. For example, AN6 has a thread size of 9/16” x 18 (threads per inch) and a hose bore of around 3/8”, while AN8 has a thread size of 3/4” x 16 (threads per inch) and a hose bore of approximately 1/2”.
Fuel Line Size Considerations
When determining the size of your fuel lines, it is important to consider the type of fuel being used. For example, ethanol requires 30% more fuel than gasoline to generate the same horsepower, so a larger fuel line may be necessary. Similarly, methanol requires double the amount of fuel, so the fuel line should be 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.
To make the plumbing process easier, consider using a fuel system plumbing kit. These kits are available from various manufacturers, such as Summit Racing, and offer a range of options to suit your needs. Kits can include fuel lines, filters, regulators, pumps, and more.
By following these steps and considerations, you can effectively plumb your fuel system, ensuring proper function and performance.
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Fuel line diameter and horsepower
Fuel line diameter is an important consideration when designing a fuel system, especially when taking horsepower requirements into account. Choosing the appropriate fuel line diameter ensures optimal engine performance and prevents issues such as restricted fuel flow or insufficient pressure.
The relationship between fuel line diameter and horsepower is critical to achieving desired engine performance. A fuel line with an insufficient diameter may struggle to deliver the necessary fuel volume to meet the horsepower demands of the engine. This can result in the engine not receiving enough fuel to generate the desired horsepower, hindering overall performance. Conversely, a fuel line with an excessive diameter can lead to longer pressurization times. If the pump is unable to maintain the required pressure, it can drop during periods of high demand, potentially causing engine damage.
When selecting the appropriate fuel line diameter, it is crucial to consider the type of fuel used. For instance, ethanol requires approximately 30% more fuel than gasoline to generate the same horsepower, while methanol demands twice the amount of fuel. Therefore, when designing a fuel system for these alternative fuels, it is recommended to increase the fuel line diameter by one or two sizes compared to the gasoline requirement.
In-line fuel pump manufacturers often provide recommendations for fuel line diameters that are compatible with their pumps. Following these suggestions helps prevent issues such as starving the pump. Additionally, return lines, which are the fuel lines after the regulator, can typically be one size smaller in diameter than the feed line.
It is worth noting that there is a common misconception that larger fuel line diameters are always necessary to support higher horsepower. However, this is not always the case. For example, a 3/8" inner diameter fuel line is capable of supporting 600 horsepower with sufficient "pump head". With a powerful enough pump, the same fuel line could even accommodate 1000 horsepower. Therefore, it is essential to consider the interplay between fuel line diameter, fuel flow, and pump capacity when designing a fuel system that can meet the horsepower requirements of the engine.
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Frequently asked questions
The size of the fuel line you need will depend on the type of car you have. Most production cars have an 8mm push-on hose, while older, smaller-engined cars with carburetors can have a 6mm hose. Larger-engined cars can run a 10mm hose, and fuel-injected cars can have a hose size ranging from 12mm to 15mm.
Yes, the size of the fuel line can impact the performance of your engine. If the fuel line is too small, it may restrict fuel flow and not be able to keep up with the engine's demand. However, a larger fuel line may be unnecessary and more expensive.
The size of the fuel line you need will depend on various factors, including the engine size, fuel type, and pump head. For example, if you use alcohol or E85 fuel, you will need a larger fuel line to accommodate the higher flow rate.
If you experience a pressure drop as the engine RPMs increase, it could indicate that your fuel line is too small. However, a dirty fuel filter could also be the culprit, so it is essential to check that first.
Small engines, such as those in mowers and power washers, typically have a fuel line size of 5mm x 8mm or 1/4". It is important to ensure that the fuel line fits snugly on the fittings to prevent leaks.
