Fuel Pressure Requirements For Coyote Swap Engines

The Coyote swap requires a return-style fuel system to generate a fuel pressure of 55-58 psi. This can be achieved through a Holley 255 LPH OE Style EFI Fuel Tank Module, an Aeromotive Stealth 340lph fuel pump, or a Deatschwerks 255 LPH in-tank fuel pump. The fuel pressure can be adjusted using an Aeromotive 13130 Adjustable Fuel Pressure Regulator. It is important to ensure that the fuel return line is not too small, and that the fuel filter is not clogged, as these can cause issues with fuel flow and engine performance.

The required fuel pressure is 55-58 psi

The required fuel pressure for a Coyote swap is 55-58 psi. This is a consistent requirement across different Mustang models, from the 1967 Fastback to the 1983-97 Mustang.

The fuel pressure needs to be set at the regulator to 55 psi, as per the Controls Pack instructions. This is to ensure that the engine receives the required volume of fuel at the necessary pressure. The fuel pump should be a return type, and the fuel line should be a 55-psi rated rubber hose.

The Aeromotive Stealth II tank is one option for the fuel pump, and the Holley 255 LPH OE Style EFI Fuel Tank Module is another, which also provides a steady 58 psi. For the fuel line, the Earl's Vaporguard rubber hose is a suitable option, and the Aeromotive 13130 Adjustable Fuel Pressure Regulator can be set to the required 55 psi.

It is important to note that as fuel pressure is raised, the flow available from the fuel pump decreases. Therefore, it is recommended to start with the basics and set the adjustable regulator to the same fuel pressure as the stock regulator before making any sweeping changes.

A return-style fuel system is needed

The return-style fuel system offers several advantages for the Coyote swap. Firstly, it ensures that the engine receives a sufficient volume of fuel at the required pressure. This is crucial for the engine's performance and fuel efficiency. Secondly, the return-style system provides flexibility in terms of fuel pump options. While an in-tank pump can be used to maintain a steady fuel pressure, an external pump can also be considered for simplicity and cost-effectiveness.

When choosing a fuel pump for the return-style system, it is important to select one that can deliver the required fuel pressure and flow rate. For example, a 255lph pump may not be sufficient for a Coyote swap, and upgrading to a 305lph pump from Quantum Fuel or Aeromotive is recommended. Additionally, the fuel filter and regulator play crucial roles in maintaining the desired fuel pressure. It is suggested to set the regulator to the same fuel pressure as the stock regulator, as increasing the pressure can reduce the flow rate from the fuel pump.

The Coyote swap fuel system kits available on the market typically include the necessary components, such as the fuel pump, filter, regulator, and fuel lines. These kits are designed to work with stock Coyote fuel rails and provide a straightforward solution for the fuel system requirements of the Coyote swap.

In summary, a return-style fuel system is essential for a Coyote swap to achieve and maintain the required fuel pressure. This system offers flexibility in fuel pump choices and ensures the engine receives an adequate fuel supply. Proper selection and configuration of the fuel pump, filter, and regulator are critical for optimal performance.

A returnless system can be converted to a return-style system

The fuel pressure for a Coyote swap depends on the setup. For example, a Holley 255 LPH OE Style EFI Fuel Tank Module is set to 58 PSI. However, some sources suggest setting the fuel pressure at the regulator to 55 PSI per the Controls Pack instructions.

Now, onto the question of whether a returnless system can be converted to a return-style system. The answer is yes, it is possible to convert a returnless system to a return-style system. A return-style fuel system, also known as a return-type fuel system, is a traditional method of fuel delivery where the fuel pressure regulator is integrated into the fuel rail. This means that there will be a fuel line running up to the fuel rail and a return line coming back from the fuel rail. This type of system typically requires an in-line fuel filter to complete the setup.

On the other hand, a returnless fuel system does not have a dedicated return line from the fuel rail. Instead, it regulates fuel pressure electronically or through an external regulator. While a returnless system can be converted to a return-style system, it is important to note that the conversion may be illegal in certain states due to smog-related issues.

There are a few ways to convert a returnless system to a return-style system. One way is to use a return-style fuel pressure regulator, which can be installed before the fuel rails with the return line going back to the tank. Another method is to use a "Corvette-style" filter and regulator unit, which regulates fuel pressure to the required 58 PSI while also acting as a fuel filter. This option is cost-effective but may not be sufficient for high-flow fuel systems. For such setups, an aftermarket adjustable fuel pressure regulator is recommended.

In conclusion, while a returnless system can be converted to a return-style system, it is important to consider the legal implications and the specific requirements of your fuel system. Consulting with a professional or a specialist forum may be helpful before making any modifications.

A 255 lph pump should be sufficient, but a 305 lph pump is recommended

When it comes to fuel pressure, the Coyote swap requires a consistent 58 PSI. This can be achieved through a return-style fuel system, which is designed to mimic the returnless system found in factory settings. While a 255 LPH pump should be sufficient to meet these requirements, a 305 LPH pump is generally recommended for optimal performance.

The Holley 255 LPH OE Style EFI Fuel Tank Module, for example, can be directly fitted to the tank and is set to provide the necessary 58 PSI. This particular pump has been used successfully in a 1967 Mustang with a 289 engine, maintaining a steady 58 PSI as indicated by the fuel pressure gauge.

However, for a more powerful Coyote engine, such as those found in Mustang and F150 donor vehicles, a higher-capacity pump may be more suitable. The Aeromotive Stealth 340 LPH fuel pump, included in the Power By The Hour Performance kit for Coyote Swapped Fox Body Mustangs, is designed to support engines with 400-500 horsepower. This pump is a direct replacement for the stock unit in 1983-1997 Fox Mustangs.

While a 255 LPH pump can work adequately, especially for stock Coyote engines, upgrading to a 305 LPH pump offers several advantages. Firstly, it ensures a more robust and consistent fuel supply, which is crucial for maintaining the required fuel pressure and optimizing engine performance. Secondly, opting for a higher-capacity pump provides a greater margin of safety, reducing the risk of fuel-related issues that could potentially damage the engine.

In conclusion, while a 255 LPH pump may be sufficient for a basic Coyote swap, upgrading to a 305 LPH pump is recommended to ensure optimal fuel delivery, support high-performance engines, and prevent potential fuel-related problems.

A fuel filter may need to be replaced

The Coyote swap requires a return-style fuel system to generate a fuel pressure of 55-58 psi. This can be achieved by setting the fuel pressure regulator to the desired psi.

It is important to note that the fuel filter is not the only component that can cause fuel flow or pressure issues. Other components, such as the fuel pump, fuel lines, and fuel pressure regulator, can also contribute to these problems. Therefore, it is recommended to inspect and replace the fuel filter as part of regular maintenance or when troubleshooting fuel system issues.

When replacing the fuel filter, it is important to use a compatible fuel filter with the correct micron rating. The fuel filter housing and bracket should also be inspected and cleaned if necessary. Additionally, it is recommended to replace the fuel filter when installing a new fuel pump to ensure optimal performance and prolong the life of the fuel pump.

In some cases, a fuel filter may not be the root cause of the issue. For example, if the fuel pump is not supplying enough fuel pressure or flow, it may be necessary to upgrade to a higher-capacity fuel pump or install a larger fuel line to accommodate the fuel requirements of the engine. It is always recommended to refer to the vehicle's service manual or seek professional assistance when troubleshooting and replacing fuel system components.

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