Regan Brown
The carburetor is a mechanical device that mixes air and fuel before sending the mixture into the cylinders of an engine. Carburetors are commonly found in older vehicles, such as the Ford Mustang Foxbody. The fuel line on a carburetor is responsible for delivering fuel to the engine, and the setup of this line can vary depending on the specific configuration of the vehicle. In this article, we will explore the different ways to route the fuel line on a carbureted Foxbody, as well as some of the considerations that need to be made when modifying or repairing this system.
| Characteristics | Values |
|---|---|
| Fuel line conversion | EFI to carburetor |
| Fuel line type | Hard metal, anti-corrosion stainless steel |
| Fuel line size | 5/8 |
| Number of lines | 2 (1 feed, 1 return) or 3 (fuel supply, fuel return, radiator overflow) |
| Fuel pump | Low-pressure, external electric pump |
| Fuel system | Carburetor or EFI |
| Ease of maintenance | Carburetor is easier to work on with fewer wires |
| Reliability | Carburetor is less reliable than EFI |
| Performance | Carburetor produces slightly less horsepower and torque than EFI |
| Cost | Carburetor is cheaper to replace than EFI |
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What You'll Learn
Braided fuel line routing
Braided fuel lines are a popular choice for Foxbody owners, and there are a few things to keep in mind when routing them. Firstly, it is recommended to avoid routing the fuel lines into the wheel wells, as debris kicked up by the tires could strike them. Instead, following the factory fuel line routing is generally considered the safest option. Staying within the same general area as the factory lines will likely keep the fuel lines away from potential hazards.
When it comes to the specific routing of braided fuel lines, there are a few methods Foxbody owners have employed. One common approach is to run the lines from the sump to the pump, down the passenger side, and up through the wheel well behind the strut tower into the engine bay. From there, the lines can connect to the fuel rails, with the return lines following the same route back. Some people choose to run the lines under the driver's side to keep them farther away from the exhaust.
Another option is to use bulkhead fittings and bring the lines into the engine compartment behind the passenger strut tower. This allows for easy access and inspection of the lines without interfering with the fender liner. However, this method may present more obstacles and require careful consideration of the line placement to protect them from wheel projectiles.
Additionally, some Foxbody owners have shared their experiences with running multiple braided fuel lines. One configuration includes an AN12 (fuel supply), AN8 (fuel return - partially hard line), and AN6 (radiator overflow to the reservoir in the trunk - partially hard line). In this setup, the lines are brought into the engine compartment using bulkhead fittings, with the pressure regulator supported by a fitting on the return line bulkhead.
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Fuel line kits
If you're looking for a fuel line kit for your Foxbody, there are a few options to consider. The first is whether you want to keep your factory fuel tank or not. Keeping the factory fuel tank has its benefits, as you can retain the factory fuel level sending unit and communication, and the factory gauge will stay the same. This will make things easier if you ever need to replace parts down the line. However, you will need to get rid of your factory fuel pump hanger, and the high-pressure in-tank pump will no longer be valid.
If you decide to keep your factory tank, one option is to use a custom line with AN-style fittings to your low-pressure pump. Holley offers the Holley inline electric fuel pump, which can be a good choice. Another option for a fuel line kit is the 87-93 Ford Mustang Intermediate Flexible Fuel Line Kit, which can also be used with Terminator XP Stealth Kits. This kit includes a heat shield that protects the factory fuel and brake lines from radiant header/exhaust heat.
If you're looking for a more comprehensive kit, the 1979-1993 Mustang Fuel Lines from Late Model Restoration may be a good option. This kit includes hard metal fuel supply, return, and vapor lines, as well as fuel pump to carburetor lines. The hard metal lines are made of stainless steel to resist corrosion, and the kit also includes the necessary rubber hoses and fittings to connect directly to your Mustang's factory connections. This kit is designed to fit 1979-1993 Fox Body Mustangs.
It's important to note that if you're converting from EFI to a carburetor, you'll need to install a low-pressure fuel pump and larger fuel lines to maintain the necessary flow to keep the float bowls full. Additionally, a mechanical setup will require changing the front timing cover and adding a fuel pump eccentric for proper operation. It's always a good idea to consult with your engine builder to determine the best choice for your particular setup.
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Fuel line routing for engine compartment access
When it comes to fuel line routing for the Foxbody, there are several factors to consider. The first decision is the type of fuel delivery system, such as carburetor or electronic fuel injection (EFI). This choice will impact the number of fuel lines and their routing. For example, a carbureted engine may have a simpler setup with fewer lines, while EFI systems often involve more complex configurations.
The next consideration is the path of the fuel lines. Some common routes include running the lines along the passenger side, up through the wheel well, and behind the strut tower into the engine bay. This approach keeps the lines away from the exhaust and provides easy access for inspection and maintenance. It is important to use appropriate fittings, such as bulkhead fittings, to ensure a secure and reliable connection.
Another factor to consider is the number and size of the fuel lines. Most setups will have a feed line and a return line, with the feed line typically being larger in diameter. For example, a common configuration is to use a -12AN feed line and an -8AN return line. Additionally, some setups may include a third line for radiator overflow or other purposes.
When routing the fuel lines, it is crucial to ensure they are securely mounted and protected from potential damage. While some prefer to keep the lines outside the fender liner for easier access, others may opt to tuck them behind the full-length sub-frame connectors to prevent damage if the car bottoms out. It is also important to consider the placement of the fuel pump and regulator, as these components will impact the routing of the lines.
Lastly, it is always recommended to consult with a professional or experienced mechanic when modifying fuel lines. They can provide valuable insights and ensure that the routing is safe and effective for your specific vehicle setup. By following these guidelines and considering your unique setup, you can achieve a functional and efficient fuel line routing for your Foxbody's engine compartment access.
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EFI to carburetor conversion
Converting an EFI (Electronic Fuel Injection) to a carbureted setup requires careful consideration and a good understanding of the process and potential issues. While some see EFI to carburetor conversion as a valid option, others strongly advise against it. Here is a detailed guide to help you understand the process and make an informed decision.
Reasons for Conversion
People often consider converting their EFI to a carburetor for two main reasons. Firstly, they may be unable or unwilling to troubleshoot and fix issues with their EFI system. Secondly, they may prefer a carburetor due to the higher cost of EFI performance parts and tuning. Converting to a carburetor setup is generally seen as a more affordable option.
Considerations
Before starting the conversion, it is important to note that modern EFI engines have certain advantages over carbureted setups. EFI engines can automatically adapt to changes in elevation, air temperature, and ignition timing. With a carbureted setup, you would need to manually fine-tune these parameters, which can be challenging and time-consuming. Additionally, EFI systems are generally more reliable than carbureted setups.
The Process
Converting from EFI to a carburetor involves several key steps. Firstly, you will need to eliminate the factory intake manifold and fuel injection system, along with the EFI wiring harness and associated sensors. Choosing the right carburetor and intake manifold for your specific setup is crucial, and consulting with an engine builder is highly recommended. You will also need to replace the factory intake track with a traditional-style air cleaner on the top side of the carburetor.
The fuel system conversion will start at the rear of the car with the tank. It is advisable to try and retain your factory tank to maintain the factory fuel level sending unit and communication with the factory gauge. For the fuel pump, you have the option of choosing between a mechanical or electric pump. If you opt for a mechanical fuel pump, you will need to swap over the front timing cover. Additionally, you may need to perform vacuum routing and delete some ports.
User Experiences
Online forums provide a range of user experiences regarding EFI to carburetor conversions. Some users have successfully converted their EFI systems and are happy with the improved performance and dependability. However, others strongly advise against the conversion, stating that it can affect the value of the vehicle and that EFI is generally a better option in terms of fuel efficiency and drivability. Some users also mention the challenges and expenses associated with tuning and maintaining carbureted setups.
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Fuel line maintenance
Identify the Need for Maintenance:
Ethanol in modern fuel mixtures can trap moisture in the fuel lines, causing internal rusting. Over time, this rust can flake and block fuel rails and injectors, reducing your Mustang's performance.
Prepare for Replacement:
Before starting, it is important to gather the necessary tools and parts. You will need a set of replacement fuel lines, such as the OPR Stainless Steel Fuel Lines, which are designed to fit your specific Mustang model. These lines are made of high-quality stainless steel, offering improved resistance to rust and corrosion compared to the original lines.
Remove Old Fuel Lines:
Carefully remove the old, damaged fuel lines, taking note of their routing and connections. Pay close attention to the fuel pump to carburetor lines, as well as the fuel supply, return, and vapor lines.
Install New Fuel Lines:
Install the new fuel lines, ensuring they match the correct specifications and bends for your Mustang. Connect the lines to the appropriate factory connections, using the provided rubber hoses and fittings. The stainless steel construction of the new lines will help prevent future corrosion and maintain optimal fuel flow.
Test and Verify:
Once the new fuel lines are installed, test the system for any leaks or issues. Start the engine and inspect for proper fuel flow and pressure. Verify that all connections are secure and that there is no debris blocking the fuel rails or injectors.
By following these steps, you can effectively maintain and replace the fuel lines in your Foxbody Mustang, ensuring reliable performance and preventing potential issues caused by corroded or damaged fuel lines. Remember to consult a professional mechanic or a trusted source for detailed instructions specific to your vehicle's year and model.
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Frequently asked questions
Carburetors are cheaper to replace, make the car easier to work on, and have fewer wires.
This depends on your setup. If your car already has EFI, it is recommended to stick with EFI. However, if you are starting from scratch, a carburetor is a good option to save money.
There are a few ways to do this. One way is to run the lines on the outside of the subframe/subframe connector assembly and then up into the fender well of the front passenger tire. Another method is to run the lines from the rear bumper to the firewall, using aluminum hardline which is cheap and easy to route.
You can use Late Model Restoration's 1979-1993 Mustang fuel line kits, which include hard metal fuel supply, return, and vapor lines, as well as factory-style fuel pump to carburetor lines. These kits are made of stainless steel to resist corrosion.
The conversion process involves more work than simply bolting on the carburetor and intake manifold. You will need to install a low-pressure fuel pump and larger fuel lines to maintain the necessary flow to the float bowls. You will also need to rewire some sensors and add a throttle linkage.
