Mercedes Mullins
LS engine swaps are a popular upgrade among car enthusiasts as they offer a significant boost in performance. One of the most important parts of this upgrade is ensuring your new LS engine receives the right amount of fuel. This is where fuel lines come in. They are a key component in any fuel injection system, transporting gas from the tank to the engine. This process is facilitated by a fuel pump, which pressurizes the fuel from the tank, allowing it to travel through the fuel lines and into the engine. There are two types of fuel pumps for LS engine swaps: in-tank and external. In this article, we will discuss how to make a fuel line LS, covering the different types of fuel lines suitable for LS engines and providing step-by-step instructions for installation.
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What You'll Learn
In-tank vs. external fuel pumps
Fuel lines are a critical component of any fuel injection system, facilitating the transfer of fuel from the tank to the engine. This process is enabled by a fuel pump, which pressurises the fuel, allowing it to traverse the fuel lines and reach the engine. There are two primary types of fuel pumps for LS engine swaps: in-tank and external (inline). This article will explore the differences between these two options and provide insights into which type may be best suited for your vehicle.
In-tank fuel pumps offer several advantages, including increased durability, superior handling of high pressure, reduced noise, enhanced fuel delivery efficiency, and a decreased likelihood of vapor lock. They provide a more seamless fuel supply to the engine, contributing to improved overall engine performance. However, one of the main drawbacks of in-tank fuel pumps is the complexity of their installation and retrofitting process.
On the other hand, external fuel pumps, also known as inline fuel pumps, present their own set of benefits. They are generally easier to install, tend to be more affordable, and offer greater convenience when it comes to maintenance and replacement. This ease of installation and replacement is a significant factor in their favour, as it can save time and effort, especially when compared to the more intricate process of accessing and working with in-tank pumps.
When selecting an external fuel pump for an LS swap, it is important to choose one designed for EFI (electronic fuel injection) applications. Carburetor fuel pumps typically deliver lower pressures, making them unsuitable for LS engines, which require higher fuel pressures. Additionally, when installing an external pump, careful consideration must be given to fuel line routing and cooling. The pump should be mounted at or below the bottom of the fuel tank, as close to it as possible, to facilitate optimal performance.
In conclusion, the decision between in-tank and external fuel pumps depends on various factors, including the specific requirements of your vehicle, your budget, and your comfort with installation processes. Both options have their advantages and considerations, so it is essential to carefully weigh these factors before making a decision. Ultimately, the choice should align with your vehicle's needs and your personal preferences to ensure a seamless and enjoyable driving experience.
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Fuel line routing and cooling
Firstly, it is important to select the appropriate fuel pump type for your LS engine swap, choosing between an in-tank pump and an external (inline) pump. In-tank pumps offer several advantages, including increased durability, better handling of high pressure, reduced noise, more efficient fuel delivery, and a lower likelihood of vapor lock. However, they are typically more complex to install and retrofit. On the other hand, external pumps are generally easier to install, more cost-effective, and simpler to maintain and replace, but they are louder than in-tank pumps. For LS engines, the fuel pump must deliver 58-60 psi of pressure to the injectors, with a flow rate between 240-340 LPH, depending on the horsepower.
When it comes to fuel line routing, the pump should be mounted at or below the bottom of the fuel tank for optimal performance. EFI pumps, which are designed to push fuel, are recommended for LS swaps, as carburetor fuel pumps typically provide lower pressures that may be unsuitable for LS engines. Additionally, it is crucial to consider the fuel line material and fittings. Braided fuel hoses, such as those made from stainless steel or nylon, are often used and can be adapted to existing metal lines. However, some sources suggest that metal or OEM-style plastic tubing may be more durable and cost-effective than fuel hose. AN hose and fittings are commonly used for LS swaps and are available in kits that include all the necessary components for installation.
To ensure the longevity of the fuel lines, it is important to consider the type of fuel and the potential for leaks. Today's fuels can be harsh on rubber hoses, so some recommend using PTFE-lined hose or metal/plastic tubing instead. Additionally, it is crucial to secure the fuel lines properly and protect them from heat sources. Heat wrap or heat sleeve can be used on any hose that is near a heat source to prevent damage.
Finally, fuel line cooling is essential to maintain the integrity of the fuel and the fuel lines themselves. In-tank fuel pumps inherently provide some cooling due to their location within the fuel tank, which helps dissipate heat. However, external pumps may require additional cooling measures, such as ensuring adequate ventilation and using heat-dissipating materials for the fuel lines. Overall, careful consideration of fuel line routing and cooling is critical to the success of an LS engine swap, ensuring the engine receives the right amount of fuel for optimal performance.
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Fuel filters
For a return-style setup, which involves fuel flowing back to the tank through a return line, fuel filters are typically placed both before and after the fuel pump. Pre-pump, a 100-micron fuel filter is recommended to protect the pump from debris. Post-pump, a minimum of a 30-micron filter is suggested, with a 10-micron filter being the ideal choice for maintaining a clean fuel system. This two-filter setup ensures that any contaminants or debris picked up by the fuel are captured before they can enter the engine, reducing the risk of engine damage.
In contrast, a return-less setup does not have a dedicated return line, and the fuel pressure regulator is often integrated into the fuel rails. For this type of setup, a single fuel filter is typically used, and a 10-micron filter is recommended. This filter is usually placed before the fuel pump to protect it from debris and ensure that clean fuel is delivered to the engine.
When selecting fuel filters, it is important to consider their compatibility with the chosen fuel pump and regulator. For example, in a return-less setup, the Corvette-style regulator and filter are commonly used together, providing a convenient and effective solution for LS swaps. Additionally, some fuel pumps, such as the EP241 pump, may not require an external regulator as they can maintain the required pressure using the OEM TBI regulator.
It is worth noting that fuel filters are just one aspect of a fuel system, and other components such as fuel lines, pumps, and regulators, also play vital roles in ensuring the engine receives the right amount of fuel at the correct pressure. When designing or modifying a fuel system, it is essential to consider all these components together to achieve optimal performance and maintain the longevity of the engine.
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Fuel pressure and PSI
Fuel pressure is a crucial aspect of any fuel injection system, and when it comes to LS engine swaps, ensuring that the engine receives the correct fuel pressure is of utmost importance. The standard fuel pressure requirement for LS engines is around 58-60 PSI delivered to the injectors. However, there is some flexibility, and truck-based LS engines can operate with fuel pressures as low as 50 PSI, although they may not run optimally and may exhibit issues such as lean fuel trim codes and stumbling or stalling under heavy load.
To achieve the desired fuel pressure in an LS swap, the type of fuel pump and its associated components play a significant role. There are two main types of fuel pumps used in LS engine swaps: in-tank and external (inline) pumps. In-tank pumps are known for their durability, superior handling of high pressure, reduced noise, efficient fuel delivery, and lower likelihood of vapor lock. On the other hand, external (inline) pumps are generally easier to install, more cost-effective, and simpler to maintain and replace. However, they require careful consideration of fuel line routing and cooling, and they need to be mounted at or below the bottom of the fuel tank.
For in-tank pump setups, a pre-pump fuel filter, typically a 100-micron filter, is recommended to protect the pump from debris. After the pump, a minimum of a 30-micron post-pump filter is suggested, with a 10-micron filter being ideal for maintaining a clean fuel system. Additionally, a regulator is necessary to deliver the required PSI to the LS fuel rails. The Corvette-style regulator is a popular choice for LS swaps, and it pairs well with the Return-less setup.
When selecting an inline fuel pump for a return-less setup, it is important to choose one designed for EFI applications, as carburetor fuel pumps may not provide sufficient pressure for LS engines. The chosen pump should meet the engine's specifications, delivering the correct flow rate and pressure. Proper pump placement is also crucial, and it should be installed as close as possible to the bottom of the fuel tank to ensure optimal performance.
It is worth noting that fuel pressure can be influenced by various factors, including the strength of the fuel pump and the presence of a check valve. Some fuel pumps may push through stock regulators due to their high volume, and the use of an adjustable regulator with a gauge is recommended to monitor and control the fuel pressure accurately. Additionally, the size of the fuel lines themselves can impact fuel pressure and overall system performance. Undersizing or oversizing the fuel lines can lead to issues, and it is important to consider factors such as the type of fuel and future performance goals when determining the appropriate line sizes.
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Hose materials
Nylon Hose: Nylon hoses are flexible and easy to work with. They are known for their durability and have been reported to last for years without any issues with leaks or fittings. However, some users have noted that bending nylon lines can be tricky. It is also recommended to carry a fire extinguisher when using nylon hoses, as the material is flammable.
Rubber Hose: Rubber hoses are commonly available and can be purchased from auto parts stores like AutoZone. They are suitable for fuel injection systems and are typically paired with clamps designed for fuel injection to ensure a secure connection. It is important to note that today's fuels can be harsh on rubber hoses, potentially reducing their lifespan.
Braided Hose: Braided hoses, often made of stainless steel, are known for their strength and durability. They can withstand high pressures and are less susceptible to leaks compared to other hose materials. Braided hoses are commonly used in fuel injection systems and are recommended by some car enthusiasts for LS fuel line installations.
AN Hose: AN hoses, made of synthetic rubber with a braided nylon outer sheath, are a popular choice for LS fuel line swaps. They offer flexibility, lightweight construction, and compatibility with various fittings. AN hoses are suitable for most automotive applications and can be used with hydrocarbon and alcohol-based fuels, lubricants, and additives.
When selecting a hose material, it is important to consider factors such as durability, flexibility, compatibility with fittings, and ease of installation. Additionally, ensuring that the hose can withstand the required pressure and flow rate is crucial for the safe and efficient operation of the fuel system.
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Frequently asked questions
There are two types of fuel pumps for LS engine swaps: in-tank and external (inline). In-tank pumps are more durable, handle high pressure better, produce less noise, deliver fuel more efficiently, and have a lower propensity for vapour lock. External pumps are easier to install, cost less, and are simpler to maintain and replace.
The essential components of a return-less setup include an inline fuel pump, filters, and a regulator to achieve the required PSI for the fuel rails.
It is recommended to install a 100-micron fuel filter before the pump to protect it from debris. After the pump, a 30-micron filter is recommended, with a 10-micron filter being ideal for maintaining a clean fuel system.
There are various fuel line kits available, such as the GM LS Engine Fuel Line Kit, which includes 25 feet of line and all the necessary fittings. Another option is the Black Push Lock Hose, which is flexible, lightweight, and compatible with hydrocarbon and alcohol-based fuel.
