Ameer Randolph
Fuel lines are an essential component of any vehicle, but their placement is subject to strict regulations to ensure safety. One critical area of concern is the firewall, a barrier that separates the vehicle's engine and passenger compartments, designed to prevent fires from reaching the driver and passengers. Mounting fuel lines on the firewall is a controversial topic among car enthusiasts, with some arguing that it provides a clean installation, while others highlight potential safety hazards. This discussion explores the rules and considerations surrounding fuel line placement, particularly in relation to firewalls, and seeks insights from those with hands-on experience.
Fuel Lines and Firewalls Characteristics
| Characteristics | Values |
|---|---|
| Fuel lines mounted on the firewall | Banned from drag racing due to safety concerns |
| Fuel pressure regulator mounting | Not attached to the firewall; spaced out 6" |
| Fuel lines near the flywheel/flexplate | Must be 6" forward or behind; cannot be mounted to the firewall |
| Fuel system penetrations | Sealed penetrations reduce the risk of fire spreading to the firewall |
| Fuel filter/water separator | Can be bypassed and replaced with a combo fuel filter/water separator |
| Fuel gauge | Can be mounted on the cowl with an isolator |
| Fuel lines and firewall safety | Running lines outside the frame in the firewall area is safer |
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What You'll Learn
- NHRA rules state that fuel distribution blocks must be mounted 6 forward of the flywheel/bell housing area
- Fuel lines must be protected as they pass by the bell housing area
- Fuel lines must not be attached to the firewall
- The fuel pump circuit must be controlled with a cutoff switch
- The firewall can deform in a crash, so lines by the bell housing/clutch within a distance should be shielded
NHRA rules state that fuel distribution blocks must be mounted 6 forward of the flywheel/bell housing area
The NHRA rule book states that any fuel distribution blocks must be mounted at least 6 inches forward of the flywheel/bell housing area. This rule is in place to prevent fuel lines from being near or on the firewall, as this could result in a dangerous explosion if the flexplate or flywheel cuts the fuel lines.
Fuel lines must also be protected as they pass by the bell housing area. This can be done by using a thick piece of steel angled plate bolted to the subframe to cover the fuel lines in this area. Additionally, all fuel lines in the flywheel/bell housing area must be enclosed in a 16-inch length of steel tubing with a minimum wall thickness of 1/8 inches. This tubing must be securely mounted to protect against fuel line rupture.
It is important to note that the NHRA rules also specify that fuel tanks, lines, pumps, valves, etc., must be outside of the driver's compartment and within the confines of the frame and/or steel body. All fuel tanks must be isolated from the driver's compartment by a firewall that is completely sealed to prevent any fuel from entering.
Some people have expressed confusion or disagreement with these rules, particularly regarding the mounting of fuel pressure regulators and the routing of fuel lines. However, adhering to the NHRA rules is crucial for safety and to ensure compliance during inspections.
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Fuel lines must be protected as they pass by the bell housing area
The safety of fuel lines is a critical aspect of vehicle design, and it is essential to adhere to regulations that ensure the protection of both the vehicle and its occupants. When it comes to the fuel lines passing by the bell housing area, several guidelines must be followed to mitigate the risk of accidents and potential hazards.
Firstly, it is important to note that fuel lines in the bell housing area should be enclosed in a protective casing. This is to prevent the fuel lines from being severed in the event of a flywheel malfunction, which could lead to a dangerous fire. The NHRA (National Hot Rod Association) regulations specify that fuel lines in this area must be enclosed in a 16-inch length of steel tubing with a minimum wall thickness of 0.125 inches, securely mounted to provide adequate protection. This requirement applies to all non-OEM fuel lines, including those used for gauges and data recorders.
Additionally, the choice of materials for the fuel lines themselves is crucial. The NHRA mandates that these fuel lines must be metallic, steel braided, or NHRA-accepted "woven or woven-pushlock." This ensures that the lines are durable and can withstand potential impacts or abrasions. It is worth noting that a maximum of 12 inches of non-metallic or non-steel braided hose is permitted for connection purposes only, excluding individual injector nozzle and motorcycle fuel lines.
Furthermore, the routing of the fuel lines is another important consideration. They should not be routed through the driveshaft tunnel and must maintain a safe distance from the bell housing area. Some vehicle owners opt to run the fuel lines outside of the frame rail, providing an additional layer of protection by utilising the frame as a barrier between the lines and the flywheel. This approach also helps to keep the lines away from heat sources, which is crucial for safety and the integrity of the fuel system.
To summarise, fuel lines passing by the bell housing area must be treated with utmost caution. Enclosing them in steel tubing, using approved materials, and careful routing are all essential measures to ensure the safety of the vehicle and its occupants. By following these guidelines, the risk of accidents and fires caused by fuel line rupture or damage is significantly reduced.
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Fuel lines must not be attached to the firewall
Secondly, mounting fuel lines to the firewall can introduce safety risks. In the event of a fire, fuel lines attached to the firewall could potentially act as a conduit for the fire to spread, compromising the integrity of the firewall. Additionally, there is a risk of fuel leakage from the lines, which could result in a dangerous situation if the fuel comes into contact with any ignition sources.
Furthermore, the firewall is subject to vibrations and heat fluctuations during vehicle operation. Mounting fuel lines directly to the firewall can put stress on the lines, potentially leading to damage or leaks over time. It is also important to note that fuel lines require some flexibility to accommodate engine movement and vibration. Attaching them to the firewall restricts their movement, which could lead to premature failure or leaks.
Therefore, it is recommended to keep fuel lines away from the firewall and securely mount them elsewhere in the vehicle, ensuring they are adequately protected and do not pose a safety hazard. This configuration adheres to safety regulations, such as those outlined by the NHRA (National Hot Rod Association), which specify the placement and protection of fuel lines to maintain the highest safety standards.
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The fuel pump circuit must be controlled with a cutoff switch
Fuel lines cannot be mounted on the firewall. NHRA rules state that any fuel distribution blocks must be mounted 6" forward of the flywheel/bell housing area. The fuel line must be protected as it passes by the bell housing area.
Now, let's discuss the fuel pump circuit and its control with a cutoff switch. The fuel pump circuit must be controlled with a cutoff switch to enhance safety and security. In the event of a collision, a sudden stop, or a malfunction, the cutoff switch prevents the fuel pump from operating and supplying fuel, reducing the risk of fire or explosion. This safety mechanism is similar to a circuit breaker in a home.
To reset the fuel pump cutoff switch after it has been activated, locate the reset button, which is usually found in hidden places like behind or below the glove compartment, under the seat, or in the driver's footrest area. Pushing the reset button will allow you to resume normal vehicle operation.
Additionally, installing a fuel pump cutoff switch is an effective way to deter theft. This device acts as an analog to an electric fuse but for fuel. It can be manually or remotely controlled, offering convenience and security.
To install a fuel pump cutoff switch, start by identifying the power supply circuit for the fuel pump using the fuse box or the vehicle's operator's manual. Choose a discreet location for the switch, such as the glove box or under the seat, and remove the fuse related to the fuel pump circuit. Cut the wire downstream, and ensure you're cutting the correct wire by checking for zero volts with the ignition switch on.
By following these steps and understanding the importance of controlling the fuel pump circuit with a cutoff switch, you can enhance the safety, security, and overall reliability of your vehicle.
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The firewall can deform in a crash, so lines by the bell housing/clutch within a distance should be shielded
Fuel lines and regulators should not be mounted on the firewall. This is because, in the event of a crash, the firewall can deform and the fuel lines could be damaged. The NHRA rule book states that any fuel distribution blocks must be mounted 6" forward of the flywheel/bell housing area. This is to prevent the fuel lines from being damaged by the bell housing in the event of a crash.
The bell housing is a stock part that connects the transmission to the engine block. It is typically made of cast iron or aluminum and is not SFI-approved. A scatter shield is an aftermarket, SFI-approved bell housing that is used for racing. It is typically made of steel and is designed to contain an exploding clutch or flywheel, protecting the driver.
In the event of a crash, the firewall may deform and the bell housing may be damaged. If the bell housing is made of cast iron or aluminum, it may not be strong enough to contain the explosion of a clutch or flywheel. This could result in shrapnel being scattered, which could damage the fuel lines.
To prevent this, it is recommended that fuel lines be shielded or encased in a steel tube with a thickness of 1/8" and securely fastened where it passes the flywheel area. This will help to contain any explosion that may occur and protect the fuel lines from being damaged.
It is important to consider the placement of fuel lines and regulators during vehicle design and modification to ensure compliance with safety regulations and to mitigate the risk of fuel line damage in the event of a crash.
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Frequently asked questions
No, fuel lines cannot be mounted to the firewall. However, you can mount a fuel pressure regulator to the firewall if it is spaced out by 6".
There is a risk of a flexplate exploding, which could cause a fire.
Running the feed and return lines in the trans tunnel can be dangerous if a driveshaft or universal joint lets go. A safer option is to run the lines up the passenger side of the car on the outside of the frame in the firewall area.
Yes, you can bypass the water separator and use a combo fuel filter/water separator instead of the stock spin-on filter.
