Mercedes Mullins
The fuel lines of Fox and SN95 cars differ in size. Fox fuel supply lines are 5/16, while SN95 lines are 3/8. This means that the SN95 fuel lines are slightly larger than those of the Fox. It is worth noting that some people have successfully used SN95 fuel rails with a Fox body car, but this may require some adjustments to the fittings for a better fit.
| Characteristics | Values |
|---|---|
| Fox body fuel line size | 5/16" supply line, 1/4" return line |
| SN95 fuel line size | 3/8" supply line, 1/4" return line |
| SN95 gas tank compatibility with Fox body | Any SN95 gas tank before 1999 will fit in a Fox body |
| Fox body fuel rail compatibility with SN95 fuel rails | Possible to use SN95 fuel rails on a Fox body with some modifications |
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What You'll Learn
Fuel line size: Fox uses 1/4 return and 5/16 supply
The fuel line size for Fox Mustangs is 1/4" for the return line and 5/16" for the supply line. This is a common question for those working on their Fox Body Mustang, as there is often confusion around the correct fuel line sizes.
It is important to note that the return line uses a 1/4" fitting at the fuel sender, while the rest of the line is 5/16" like the supply line. The supply line is also known as the feed line, and the return line is sometimes referred to as the vent line. The Fox Body Mustang's fuel system is a returnless fuel injection system, which means it does not have a return line from the fuel rail back to the tank. Instead, the fuel is injected directly into the engine, and any unused fuel remains in the fuel line.
Some people confuse the 1/4" canister vent line for the return line, but this is incorrect. The vent line is a separate component that allows air to escape from the fuel tank, and it is usually much smaller in diameter than the return line. It is important to get the correct fuel line size, as using a line that is too small can result in restricted fuel flow and potential engine damage.
There are a variety of fuel line kits available for the Fox Body Mustang, offering direct-fit replacements for damaged, rusted, or bent factory lines. These kits include hard metal supply, return, and vapor lines, as well as factory-style fuel pump to carburetor lines. The kits are made of stainless steel to resist corrosion and typically cover model years 1979-1993.
One owner of a Fox Body Mustang reported using 95 fuel rails with Russell braided steel fuel lines. They also mentioned switching the fittings at the rail for a better fit. This modification may be necessary when combining parts from different model years or with different specifications.
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SN95 fuel rails can be fitted to a Fox body
The SN95 fuel rails can be fitted to a Fox body, but some modifications may be required for a perfect fit. The SN95 fuel rails are known to have a larger surface area and are slightly bigger than the Fox body fuel rails. This results in improved flow, which is beneficial for cars with higher horsepower.
When fitting SN95 fuel rails to a Fox body, it is essential to consider the necessary adjustments. Some car enthusiasts have reported the need to bend the inlet and outlet pipes, as well as the line that holds the regulator, to ensure proper alignment and bolt installation. This process may require a tube bender and a careful approach to achieve the desired bends.
Additionally, the fittings at the rail may need to be switched for better fitment. Russell braided steel fuel lines have been mentioned as a compatible option for the Fox body, providing a secure connection with the SN95 fuel rails. It is worth noting that the Fox and SN95 fuel systems share a similar return line size of 1/4", while the Fox supply line is typically 5/16" and the SN95 is expected to be the same or slightly larger at 3/8".
The compatibility of the SN95 fuel rails with the Fox body offers an opportunity for performance enhancement. The increased fuel flow capacity of the SN95 rails provides a safety margin for cars operating at higher horsepower, ensuring a consistent and adequate fuel supply. This upgrade can be advantageous for those seeking to push the limits of their Fox body's performance without investing in a full aftermarket fuel system.
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The SN95 gas tank is compatible with Fox
The SN95 and Fox fuel systems have some notable differences. The Fox fuel system has a 5/16" supply and a 1/4" return, while the SN95 system has a 3/8" supply and return. This means that the SN95 fuel lines are slightly larger in diameter than the Fox fuel lines.
However, it is possible to use SN95 fuel rails with a Fox body. One option is to use Russell braided steel fuel lines, which can be purchased online. The fittings may need to be switched out for a better fit, but this is a relatively simple modification.
Another option is to upgrade to a newer fuel system, such as the one from a 1994-1995 SN95. These fuel rails are reported to have a higher flow rate than the Fox rails, which may be beneficial for those seeking increased horsepower.
It is important to note that when making any modifications to a fuel system, it is crucial to prioritize safety. Always consult a professional or a trusted mechanic if you are unsure about any aspect of the installation or modification process.
Additionally, when upgrading or modifying fuel lines, it is important to consider the compatibility of the fuel tank. For Fox bodies, it is recommended to use a gas tank from an SN95 model year 1994-1997. The 1998 and newer SN95 gas tanks feature a returnless fuel system, which may not be compatible with the Fox fuel system without significant modifications.
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Upgrading the fuel system: the stock rails may need to be replaced
When upgrading the fuel system, it is important to consider the condition and compatibility of the stock fuel rails. While the stock rails may be sufficient for some setups, there are situations where upgrading or replacing them becomes necessary.
One key indicator that the stock fuel rails may need to be replaced is if they become damaged or faulty. This could include issues such as leaks, excess fuel entering the injectors, or a decrease in fuel efficiency. For example, a faulty rail can cause the engine to surge when the throttle is pressed. In such cases, replacing the fuel rail with an upgraded version can help prevent serious engine damage.
Another consideration is the compatibility of the stock fuel rails with other upgraded components in the fuel system. For instance, if you have upgraded the heads or intake manifold, it is recommended to also upgrade the fuel rails and lines for safety and better performance. Additionally, if you are planning to increase the horsepower or make significant modifications to the engine, the stock fuel rails may not be able to keep up with the increased demands and may need to be replaced with higher-flowing options.
It is worth noting that simply upgrading to a higher-flowing fuel rail may not always be necessary or beneficial. As long as the stock rails are in good condition and compatible with the rest of the fuel system, they should be sufficient for most setups. However, if you do decide to upgrade, it is recommended to choose quality replacement parts, such as OEM fuel rails, to ensure proper fitment and performance.
When it comes to the specific compatibility of Fox fuel lines with SN95 fuel rails, there have been reports of successful installations. Some modifications and adjustments may be required, such as switching the fittings at the rail for a better fit. It is always advisable to consult with automotive experts or forums specific to your vehicle for detailed guidance on fuel system upgrades and compatibility.
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Using braided steel fuel lines for better fitment
Braided steel fuel lines are a popular choice for those seeking improved performance and durability from their vehicles. They offer several advantages over traditional rubber fuel lines, particularly when it comes to better fitment and compatibility.
One of the key benefits of braided steel fuel lines is their ability to withstand higher pressure levels compared to rubber lines. This makes them ideal for high-performance applications, as they can handle the increased pressure demands of more powerful engines. Additionally, braided steel lines are highly resistant to heat and abrasion, further contributing to their superior performance and longevity.
When it comes to fitment, braided steel fuel lines offer greater flexibility and adaptability. They are designed to accommodate bends and curves more easily than rigid steel lines, making them a more versatile option for custom or unique engine configurations. This flexibility can be especially advantageous when working with tight spaces or intricate fuel system layouts.
For example, in the case of SN95 fuel rails, some car enthusiasts have reported using braided steel fuel lines, specifically Russell braided steel lines, to achieve a better fit. The Russell braided lines, combined with swapping fittings at the rail, allowed for a more compatible and secure setup. This is likely due to the inherent flexibility of braided lines, which can more easily navigate around engine bay components and provide a more precise fit.
Furthermore, braided steel fuel lines are often available in a variety of sizes and configurations, catering to different vehicle requirements. Reputable brands like JEGS offer a wide range of braided fuel line kits, ensuring that enthusiasts can find the perfect fit for their specific applications. By choosing the appropriate hose size and considering factors such as flow rate, fluid viscosity, and hose length and diameter, a secure and efficient fuel system can be achieved.
In conclusion, braided steel fuel lines offer enhanced performance, durability, and heat resistance compared to traditional rubber lines. Their flexibility and adaptability make them a superior choice for custom or high-performance vehicles, ensuring a better fitment and compatibility with various engine configurations. While they may come at a higher cost, the benefits of improved performance, safety, and longevity make braided steel fuel lines a worthwhile investment for those seeking optimal results from their vehicles.
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Frequently asked questions
Yes, Fox fuel lines will fit an SN95. The Fox and SN use a 1/4" return, and the Fox supply line is 5/16".
Braided steel fuel lines are recommended for SN95s.
The Fox fuel line has a 5/16" pickup in the tank, while the SN has a 3/8" pickup.
Yes, an SN95 gas tank will work in a Fox body. Any SN95 gas tank from before 1999 will fit, as 1999 changed to a returnless style.
