Rajan Wilcox
Converting an EFI to a carbureted setup requires a few key changes, and one of the most important is the fuel system. This includes a new fuel pump and pickup, with options for electric low-pressure pumps or mechanical fuel pumps. The popular Holley inline electric fuel pump is a tried-and-true option, including the necessary regulator to dial in the setup. Mechanical fuel pumps, on the other hand, require changing the front timing cover and adding a fuel pump eccentric. Custom fuel lines are also needed for the entire car, and the factory intake manifold and fuel injection system are typically eliminated. While EFI engines automatically adapt to elevation, air temperature, and ignition timing changes, carbureted setups offer a unique challenge and are becoming a lost art.
| Characteristics | Values |
|---|---|
| Fuel line | 1/2" aluminum tubing |
| Intake manifold | Weiand Stealth |
| Carburetor | Speed Demon 650 with vacuum secondaries |
| Fuel pump | Mallory |
| Fuel lines and fittings | Earl's Speed Flex #8 feed and return lines with Speed Seal |
| Distributor | MSD billet |
| Cooling fan controller | Derale |
| Fuel pressure regulator | Holley |
| Fuel pump for carbureted setup | Electric low-pressure pump or mechanical fuel pump |
| Fuel pickup | Purpose-built without an in-tank pump |
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What You'll Learn
Fuel system changes
When it comes to fuel system changes, there are a few key considerations to keep in mind when converting from EFI to carb in a SN95 Ford Mustang. Firstly, it is important to retain the factory fuel tank, fuel level sending unit, and factory gauge to ensure compatibility and make any future replacements easier. Secondly, the factory fuel pump hanger and high-pressure in-tank pump will need to be replaced. You can choose between an electric low-pressure pump designed for a carburetor, such as the Holley red or blue pumps, or a mechanical fuel pump. However, if you opt for a mechanical pump, you will need to swap over the front timing cover and add a fuel pump eccentric for proper operation.
Additionally, custom fuel lines will be required for the entire car, and you can utilize popular AN-style fittings to connect to your low-pressure pump. The Holley inline electric fuel pump is a popular choice as it includes a regulator to dial in your setup. Carbureted applications typically operate at 5-7 PSI, while EFI applications can run at 35-40 PSI. It is also important to note that you must replace the fuel pickup on top of the gas tank with a purpose-built pickup that does not include an in-tank pump.
Furthermore, the factory intake manifold and fuel injection system, along with most of the EFI wiring harness and associated sensors, will need to be eliminated. This will impact the sensors connected to the gauges, and you may need to rewire the sensors or consider buying a whole set of autometer gauges and creating a new instrument panel.
Lastly, some users have shared their experiences with specific parts and setups, such as using an external Mallory fuel pump and an MSD billet distributor with a Soft Touch Rev Control, which can provide insights into the performance and compatibility of different components.
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Intake and carburetor
When converting from EFI to carb, you will need an intake manifold and a carburetor. It is important to size these components to match your combination properly. For instance, if you have a drag car, you may need to upgrade to a fuel cell or modify your existing tank for a bottom sump.
You will also need a new fuel pump and pickup. It is recommended to use either an electric low-pressure pump designed for a carb (such as the Holley red or blue pumps) or a mechanical fuel pump. If you opt for the latter, you will need to replace the front timing cover and add a fuel pump eccentric. Additionally, you must replace the fuel pickup on top of the gas tank with a purpose-built pickup that does not include an in-tank pump.
There are several companies that offer intake and carburetor combo kits, such as Edelbrock, SCAT, Mopar Performance, and Summit Racing. These kits typically include the intake manifold, carburetor, air cleaner, fuel line, gaskets, and bolts. For example, the Edelbrock Performer kit for Ford small block engines includes a 600 CFM carburetor, while the Edelbrock Dual Quad kit for Chrysler 413, 426, and 440 engines features 600 CFM natural carburettors.
It is worth noting that carbureted configurations are becoming less common, and tuning can be an issue if you do not have the necessary knowledge and skills. Modern-day EFI engines are also more adaptable to changes in elevation, air temperature, and ignition timing.
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Fuel pressure regulators
Aeromotive Inc., a high-performance aftermarket manufacturer, offers the Aeromotive 13220 EFI-2-Carb Dual Stage Regulator. This regulator is specifically designed for vehicles with OEM fuel-injected engines that are being converted to a carburetor setup. It enables the use of the complete OEM EFI fuel system, including the stock EFI pump, supply and return lines, and fuel filter, while providing seamless control of bypass pressure to accommodate the carburetor. The dual-stage pressure control allows for pump/line pressure adjustment from 8-16 PSI and carburetor pressure adjustment from 5-9 PSI.
When choosing a fuel pressure regulator for a carbureted engine, there are two main types to consider: deadhead regulators and return-style regulators. Deadhead regulators must be installed upstream of the carburetor, preferably near it, and they require a dedicated return line to the tank. On the other hand, return-style regulators offer more mounting flexibility, as they can be placed upstream or downstream of the carburetor or EFI injectors. It is important to note that blocking the return port on a return-style regulator to convert it to a deadhead regulator can lead to excessive fuel pressure.
Additionally, when dealing with a blow-through carbureted application, it is crucial to plumb the boost reference line to the carburetor hat to ensure that the fuel pressure matches the blower boost. This compensation is also necessary for EFI return-style systems, where the regulator is typically placed upstream of the injectors. Proper installation and attention to detail are essential to ensure the accurate and long-term performance of the fuel pressure regulator.
In conclusion, when converting from EFI to carb, selecting the appropriate fuel pressure regulator is critical. The Aeromotive 13220 EFI-2-Carb Dual Stage Regulator offers a seamless solution for vehicles with OEM fuel-injected engines, allowing for dual-stage pressure control while retaining the stock EFI fuel system components. Proper installation and an understanding of the specific setup are key to achieving optimal fuel pressure and engine performance.
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Fuel pump options
When converting from EFI to carb, you will need a new fuel pump and pickup. It is recommended to not use the existing EFI pump. You can either use an electric low-pressure pump designed for a carb, such as the Holley red or blue pumps, or opt for a mechanical fuel pump.
If you choose to go with an electric low-pressure pump, Holley offers the tried-and-true Holley inline electric fuel pump, which includes the necessary regulator to dial in your setup. Carbureted applications typically average 5-7 PSI, while EFI applications can run around 35-40 PSI.
If you prefer a mechanical fuel pump, you will need to replace the front timing cover with one that has the provision built-in to run the pump. Additionally, a fuel pump eccentric will need to be added for proper operation. This option may require more mechanical expertise and understanding of carbureted setups, as tuning can be an issue if not done correctly.
It is worth noting that some users have reported success with the Mallory external fuel pump, which eliminates the need for an internal pump.
Another option to consider is the Carter inline pump, which offers a higher flow rate of 35gph 132lph. This pump may require modifications to the factory components, such as replacing the plastic stock lines with steel lines, to ensure compatibility.
Regardless of the fuel pump option you choose, it is important to ensure that the components are sized and matched properly to your setup.
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Gauges and sensors
One of the key considerations during this process is the fuel system. It is recommended to retain the factory tank to maintain the fuel level sending unit and communication with the factory gauge. This will make future replacements easier. However, the factory fuel pump hanger will need to be replaced, and a low-pressure external fuel pump can be used. The O2 sensors and oil level sensor can be disconnected and removed, or the oil level sensor can be rewired to remain operational.
The FiTech EFI system has been a popular choice for SN95 conversions. It is affordable, easy to install, and does not require a laptop for tuning or datalogging. However, it may not be compatible with distributorless ignition systems like EDIS. The FItech system also offers a simple and cost-effective way to gain the benefits of fuel injection for carburetor setups.
For those with more advanced knowledge, it is possible to wire the sensors from a fuel-injected motor to a different cluster. This requires a good understanding of the systems and can be challenging. Another option is to purchase a set of aftermarket gauges and an instrument panel and wire them according to the instructions.
Overall, the EFI-to-carb conversion for SN95 Ford Mustangs involves careful consideration of gauges and sensors, with options available for different levels of expertise and preferences.
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Frequently asked questions
An EFI-to-Carb fuel line adapter is used to convert an Electronic Fuel Injection (EFI) engine to a carbureted setup. This process involves replacing the factory fuel pump and pickup with a new low-pressure fuel pump and purpose-built pickup.
There are several reasons why someone might want to convert from EFI to carb. One reason could be to increase the horsepower of the engine, as carburetors can provide more fuel to the engine, resulting in more power. Another reason could be for simplicity and ease of maintenance, as carbureted setups are generally less complex than EFI systems.
One of the main benefits of using an EFI-to-Carb fuel line adapter is that it allows for the retention of the factory fuel level sending unit and communication with the factory gauge. This makes it easier to replace the fuel system in the future, as you don't have to remember the specific parts that were used during the conversion.
Some popular EFI-to-Carb fuel line adapters include the Holley inline electric fuel pump, which includes a regulator to dial in your setup, and the Mallory external fuel pump, which is recommended by some users over a mechanical fuel pump.
EFI-to-Carb fuel line adapters can be purchased from various automotive parts retailers and online stores. Some popular websites for purchasing these adapters include LMR.com and Holley.com, which offer a range of EFI-to-Carb conversion parts and accessories.
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