Sylvie Willis
Routing fuel lines in a race car can be a tricky task, with many potential pitfalls to avoid. The main considerations are keeping the lines away from rotating parts, such as the driveshaft and clutch, and away from the scrub line of the car. In addition, heat is a huge concern, with engine, headers, and exhaust systems all posing a risk of vapor lock if they come into contact with the fuel lines. The accessibility of the fuel pump and filter is also key, and the layout of the system should be designed with this in mind. With so many potential hazards, it's no wonder that many opt to run lines under the car, despite the increased risk of damage in the event of a collision.
Characteristics and Values
| Characteristics | Values |
|---|---|
| Keep the fuel line away from | Rotating parts like the driveshaft or clutch |
| The scrub line (what would get damaged if your car had a flat tire or lost a wheel) | |
| Keep the fuel line away from | Heat sources like the engine, headers, or exhaust system to avoid vapor lock |
| The drivetrain of the car, especially the bellhousing | |
| Keep the fuel line | As high as possible to avoid any potential scrub line interference |
| Accessible for servicing | |
| Out of the car (some prefer lines under the car) | |
| Away from the wheel and tire | |
| Protected by the rear frame rail and frame connector | |
| Inside the frame rail (some prefer outside the frame rail) | |
| Within 2 inches of the exhaust | |
| Within 6 inches of the header collectors | |
| Within the stock locations/outboard side of the fuel rail | |
| Within a support system | |
| Fuel line | Should be long and flexible |
| Should have smooth and large-diameter bends |
Explore related products
What You'll Learn
Keep fuel lines away from rotating parts
Routing fuel lines in a race car can be a tricky affair. One of the most important considerations is keeping the fuel lines away from rotating parts. This includes components such as the driveshaft and the clutch. A spinning driveshaft or a malfunctioning clutch can potentially cause a lot of damage if it comes into contact with the fuel line. Therefore, it is crucial to route the fuel lines in a way that maintains a safe distance from these rotating parts.
Another critical aspect is keeping the fuel lines away from the scrub line. The scrub line refers to the parts of the car that could potentially rub or scrub against the ground in the event of a flat tire or a lost wheel. It is essential that the fuel lines are not part of this equation to avoid further damage and potential fuel leaks.
To achieve this, one effective method is to route the fuel lines over the top of the inner fender and then down along the outer side of the frame rail and frame connector. This setup helps to keep the fuel lines away from the drivetrain, especially the bellhousing, and also prevents any potential scrub line interference. By keeping the fuel lines away from the wheel and tire, this method ensures their protection and reduces the risk of damage in the event of a collision or a blowout.
Additionally, it is important to consider the heat generated by the engine, headers, and exhaust system. Routing fuel lines too close to these components can result in vapor lock, as the fuel can boil due to excessive heat. To mitigate this issue, it is recommended to keep the fuel lines away from direct contact with the engine and exhaust system. Proper insulation and heat shielding can also be employed to minimize the impact of heat on the fuel lines.
Furthermore, the accessibility of the fuel filter and other components should be considered when routing fuel lines. It is advisable to mount the fuel filter in a location that is easily accessible for servicing and maintenance. This can help simplify the process of replacing or repairing the filter when needed. By carefully planning the routing of the fuel lines and considering potential hazards, you can ensure the safety and optimal performance of your race car.
Fuel Line Connection: Choosing the Right Lubricant
You may want to see also
Explore related products
Avoid engine heat
When routing fuel lines in a race car, there are several factors to consider to avoid engine heat and ensure optimal performance. Here are some detailed instructions and considerations to keep in mind:
Firstly, it is important to choose the right type of fuel line. Synthetic rubber lines and Polytetrafluoroethylene (PTFE) hoses are the two most common options. PTFE hoses have a wide range of fuel compatibility and are known for their durability, while synthetic rubber lines are compatible with pump gas and race gas but may degrade over time. It is crucial to consider your long-term goals and choose fuel lines that can accommodate potential changes in fuel type to avoid compatibility issues.
The routing of the fuel lines is crucial to keeping them away from engine heat. One recommended method is to route the lines over the top of the inner fender, which helps keep them away from the headers and the heat they generate. This can be achieved by using an L-shaped bulkhead fitting mount plate that accepts bulkhead fittings for both the feed and return lines. The feed line will then connect to the mechanical fuel pump, while the return line will go to the mechanical fuel injection bypass valve or a return-style pressure regulator.
To further protect the fuel lines from heat, consider using heat shields or sleeves for any sections of the lines that are near a heat source. Ensure that the lines are at least 6 inches away from any heat source. Additionally, using a heat-reflective material to wrap the fuel lines can help keep the fuel temperature down.
Another factor to consider is the fuel pump. Heat transfer from the engine block to the fuel pump can increase the gas temperature. Providing a focused air source to the fuel pump can help mitigate this issue and keep the fuel temperature down.
By following these instructions and considerations, you can effectively route the fuel lines in your race car while avoiding engine heat and maintaining optimal performance. Proper fuel line routing and heat management are crucial for both safety and performance on the track.
Fuel Hose Diameter Sizes: Understanding Rubber Line Standards
You may want to see also
Explore related products
Keep lines away from the scrub line
When routing fuel lines in a race car, it is important to keep the lines away from the scrub line. The scrub line refers to the parts of the car that would be damaged if a tyre goes flat or a wheel comes off. You do not want the fuel line to be part of that mess.
To keep the fuel lines away from the scrub line, they should be mounted as high as possible. The fuel lines should follow the frame connector towards the back of the car, then loop over the top of the connector and along the inner side of the rear subframe. This keeps the fuel lines away from the wheel and tyre and also protects them with the rear frame rail and frame connector.
Another way to keep the fuel lines away from the scrub line is to route them over the top of the inner fender. This also keeps them away from engine heat. An L-shaped bulkhead fitting mounting plate can be fastened to the inner fender, with a pair of bulkhead fittings for the feed and return lines.
It is also important to keep the fuel lines away from rotating parts such as the driveshaft or clutch, and away from the drivetrain. The lines should be kept out of harm's way to prevent damage and ensure optimal performance.
Ford F150 Fuel Line: 1987 Edition Specifications
You may want to see also
Explore related products
Mounting the fuel filter
When mounting the fuel filter in a race car, there are several important factors to consider. Firstly, it is crucial to determine the location of the fuel pump and filter mounts before laying out the fuel system. The fuel filter should be mounted in a spot that is easily accessible for servicing. For example, the Holley HP inline fuel filter can be mounted using Holley brackets and fabricated spacers to fit the shape of the floor pan, making it easy to access both ends of the filter.
Another consideration is keeping the fuel line away from rotating parts such as the driveshaft or clutch and the scrub line of the car. The scrub line refers to the components that would rub or get damaged if the car had a flat tyre or lost a wheel. By mounting the fuel filter away from these areas, potential issues and damage can be avoided.
Additionally, heat from the engine, headers, or exhaust system can pose a problem for the fuel line, potentially causing vapor lock. To prevent this, the feed and return lines can be routed over the top of the inner fender, away from the engine heat. An L-shaped bulkhead plate can be fabricated to mount the feed and return lines, keeping them hidden and protected.
It is also important to ensure that the fuel filter has adequate flow capability to avoid creating a restriction between the tank and the pump. High-quality, high-flow fuel filters may be more expensive, but they are necessary for maintaining pump life and performance. When using a high-performance, high-flow electric pump, it is imperative to have a good-quality, high-performance filter mounted between the tank and the pump.
Finally, when running hard lines, it is recommended to use a flexible fuel hose to connect the engine and the tank. This isolates vibration and movement, making it easier for future maintenance and potential adjustments.
Fuel Tank Line Installation Guide for My Summer Car
You may want to see also
Explore related products
Running lines under the car
Running fuel lines under a race car is a common practice, but it's important to do it safely and effectively. Here are some considerations for running lines under the car:
Firstly, it is crucial to keep the fuel lines away from rotating parts, such as the driveshaft or clutch, and as far from the scrub line as possible. The scrub line refers to the parts of the car that would be affected if a tyre goes flat or a wheel is lost. By keeping the fuel lines away from these areas, potential hazards and damage can be avoided.
Heat management is another significant concern. Fuel lines should be routed away from the engine, headers, and exhaust system to prevent vapor lock and boiling of the fuel. One effective method is to route the lines over the top of the inner fender, as this keeps them away from direct engine heat. Additionally, using flexible fuel hoses can help isolate vibration and movement, making maintenance easier.
When running lines under the car, it is essential to protect them from potential damage. This can be achieved by using a metal or plastic shield around the lines or running them through an exhaust tunnel. For rallycross vehicles, it is recommended to use UHMW/HDPE sheeting across the floor pans and rocker seams to protect the lines.
It is also important to consider the positioning of the fuel pump and filter. The filter should be easily accessible for servicing, and the lines should be routed to avoid potential driveline issues. One option is to mount the filter under the passenger seat area, away from the exhaust system.
Finally, regulations and safety standards should always be considered when routing fuel lines. Organisations like NHRA, IHRA, and SCCA have specific requirements for fuel line routing, especially when running lines inside the car. It is crucial to consult these regulations to ensure compliance and safety.
Nylon Fuel Line Safety: Where Can You Use It?
You may want to see also
Frequently asked questions
You want to keep the line away from rotating parts like the driveshaft or a clutch, and as far from the car’s scrub line as possible. The scrub line refers to what would get damaged if your car had a flat tyre or lost a wheel. Another concern is heat. You don’t want heat from the engine, headers, or exhaust system anywhere near the fuel line to avoid vapor lock.
When laying out a system, it’s best to start by determining where the components such as the fuel pump and filter(s) mount. It is also a good idea to begin with the fuel filter.
The fuel line runs alongside the engine. This works okay until the headers bake the fuel.
An alternative is to route the forward line(s) over the top of the inner fender to keep them away from engine heat.
