Regan Brown
LS engine swaps are becoming increasingly popular, with many options available to perform the swap, including kits for return style or return-less swaps. When it comes to choosing a fuel line for an LSX swap, it is important to consider the engine setup and desired fuel delivery system. For instance, a return-style setup will require more hose as both the feed and return lines need to run from the engine bay. A common choice for LS swaps is a -6AN fuel line, which supports a significant amount of fuel flow and can be used with various fittings and adapters to connect to the fuel rail. Some prefer to use a hardline for the length of the car, while others opt for a flexible line or a combination of both. It is also recommended to use a fuel filter and regulator to ensure the fuel system functions optimally.
6 Fuel Line for LSX Swap Characteristics and Values Table
| Characteristics | Values |
|---|---|
| Fuel Line Kit | AN6 |
| Pump Setup | Inline or In-Tank |
| Pre-Pump Filter | 100 Micron |
| Post-Pump Filter | Minimum 30 Micron, Recommended 10 Micron |
| Regulator | Corvette Style |
| Return Line | 6AN Stainless Braided Rubber Hose |
| Feed Line | -8AN or -6AN |
| Hose | AN Hose or PTFE |
| Fittings | AN Fittings |
| Fuel Rail Adapter | Earl's Quick Connect |
| Fuel System Kit | Jegs, Evil Energy |
| Adapter | 4th Gen Tank/Pump or 3rd Gen Tank |
| Kit Manufacturer | Sikky |
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What You'll Learn
LS engine swap kits
The LS engine swap kits typically include key components such as headers, oil pans, engine mounts, and transmission-specific parts for automatic or manual setups. Some sources recommend using an AN6 fuel line kit for LS swaps, which can be easily installed from the tank to the regulator and fuel rails with minimal effort. This type of fuel line is often paired with a Walbro 255L inline pump, which is a common choice for LS swaps and can be converted to AN6 style fittings.
Hot Rod fuel hose, for example, offers LS swap kits that cater to both return style and return-less setups. Their kits include components like sending units, ensuring a seamless fuel system installation. Additionally, their AN hose is designed to deliver fuel effectively to LS-swapped engines, catering to various vehicles.
Hedman offers LS Engine Swap-In-A-Box Kits, which are designed for specific vehicle models and transmission types. These kits are available for older Chevy/GMC trucks and SUVs, as well as the 1967-69 and 1970-74 Chevy Camaro and Pontiac Firebird models. The kits are tailored to the specific requirements of these vehicles, ensuring a precise fit and easy installation.
Sikky Manufacturing is another provider of LS engine swap kits, with a focus on delivering high-quality products for the automotive performance industry. KarlKustoms also offers a range of LS swap kits and components, including head gaskets, bolts, ignition systems, oil pans, radiators, and more.
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Return-style or return-less setups
When it comes to choosing between a return-style or return-less setup for an LS engine swap, there are several factors to consider. Both options have their advantages and are suitable for different types of vehicles and performance requirements. Here is an overview of each system to help you make an informed decision.
Return-Style Setup:
A return-style setup, also known as a return or return-type system, is identified by the presence of an integrated fuel pressure regulator on the LS engine's fuel rail. This type of system has two fuel lines: a feed line that delivers fuel to the engine and a return line that sends excess fuel back to the tank. This recirculation of excess fuel is an important feature, especially for high-performance engines, as it helps prevent fuel starvation. The fuel pressure regulator is typically integrated into the fuel rail itself, and an inline fuel filter with a micron rating of 10 or higher is required to complete the system. Return-style setups offer precise fuel pressure control, making them ideal for performance-focused applications. However, they may require more hose length due to the additional return line.
Return-Less Setup:
A return-less setup, also referred to as a non-return or returnless system, is characterised by the absence of a return line. In this design, an in-tank LS swap fuel pump sends fuel directly from the tank to the engine through a single feed line. This streamlined approach ensures that only the required amount of fuel is delivered to the engine. Return-less setups typically do not have a built-in pressure regulator but instead use alternative methods, such as an external fuel pressure regulator, to manage fuel pressure. While this may result in slightly less precise fuel pressure control compared to return-style systems, it simplifies the installation process and is cost-effective. Return-less setups are less common and are usually system-specific, making them more challenging to service.
When deciding between a return-style or return-less setup, it is essential to consider the specific requirements of your vehicle and intended use. Return-style setups are ideal for high-performance applications where precise fuel pressure control and the recirculation of excess fuel are critical. On the other hand, return-less setups offer a simplified installation process, cost savings, and a streamlined design with only a single fuel line. Ultimately, the decision should be based on your specific needs and vehicle specifications.
To summarise, both return-style and return-less setups have their advantages and are suitable for different applications. Return-style setups offer precise fuel pressure control and recirculate excess fuel, making them ideal for high-performance engines. On the other hand, return-less setups provide a simplified installation process, cost savings, and a streamlined design with only a single fuel line. Both setups are viable options for LS engine swaps, and the choice depends on your specific requirements and vehicle specifications.
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Inline fuel pump vs in-tank pump
When it comes to choosing between an inline fuel pump and an in-tank pump for an LS swap, there are several factors to consider. Both options have their advantages and the decision ultimately depends on specific requirements and preferences.
In-tank pumps are considered more efficient and quieter than inline pumps. They are also cooled by the fuel, which can be beneficial for maintaining optimal temperatures. Additionally, in-tank pumps are commonly found in most fuel-injected cars and trucks, indicating their reliability and widespread use.
On the other hand, inline fuel pumps offer greater accessibility and ease of replacement. In the event of a malfunction, an inline pump can be quickly unbolted and replaced without the need to drop the fuel tank. This convenience is particularly valuable during races or high-performance situations where time is critical. Furthermore, inline pumps are marketed for racing and high-performance applications.
Cost is another important consideration. While in-tank pumps may be more expensive due to the cost of the internals and tank, inline pumps provide a more economical option, especially if you already have a suitable tank.
It is worth noting that both setups have similar fuel filter and regulator requirements. For example, a pre-pump fuel filter of 100 microns is recommended for both setups to protect the pump from debris. Additionally, a post-pump filter of at least 30 microns, or preferably 10 microns, is suggested for optimal performance. A regulator is also necessary to deliver the required PSI to the LS fuel rails, typically around 58 PSI at the factory level.
In terms of fuel lines, an AN6 fuel line kit is commonly used for LS swaps. This kit allows for an effective and straightforward setup from the tank to the regulator and fuel rails. For the fuel rails, 3/8-inch quick connects are typically used on the feed, while 5/16-inch quick connects are used on the return.
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Fuel filters and regulators
When it comes to fuel filters and regulators for an LSx swap, there are a few things to consider and options to choose from. Firstly, it is important to determine whether your engine setup is returnless or return style, as this will impact your fuel filter and regulator choices.
For a returnless setup, you will need to run an inline fuel pump, and it is recommended to mount it as low as possible to the fuel tank. To ensure a constant feed of fuel to the pump, you can install bulkhead fittings into the tank. A pre-pump fuel filter, such as a 100-micron filter, is also essential to protect the pump from debris. After the pump, a minimum of a 30-micron post-pump filter is recommended, although a 10-micron filter is often suggested for optimal performance.
In terms of the regulator, the LS-based motors typically require a base pressure of 58 PSI. The C5 Corvette regulator is a popular choice for LS swaps, providing the required 58 PSI. This regulator is usually mounted close to the tank and offers fixed, non-adjustable fuel pressure. It also provides inline filtration between the fuel pump and the injector rail.
For a return-style setup, the process is similar, but there are some differences to note. The fuel pressure regulator may be built into the fuel rails themselves on the LS engine, so it is important to check this before installing a separate regulator. Additionally, a return-style setup will require more hose as both the feed and return lines need to run from the engine bay.
There are also fuel system swap kits available specifically for LS engines, which can provide all the necessary components for a seamless fuel system installation. These kits often include filters, regulators, and fittings designed to work together effectively. It is important to choose reputable brands and high-quality parts to avoid issues with fuel pressure fluctuations and leaky fittings.
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AN hose and fittings
For a successful LS swap with AN fittings and hoses, you can opt for either an inline fuel pump (Setup A) or an in-tank pump (Setup B). Setup A involves mounting an inline pump as low as possible near the fuel tank, while Setup B is a more common option with the Walbro 255L inline pump that can be converted to AN6 style fittings.
To ensure a seamless fuel system, you should consider using a fuel system swap kit, which includes components like sending units, fuel filters, and regulators. These kits are designed to make the installation process easier and provide a performance upgrade to your LS-swapped engine.
When it comes to AN hose and fittings, Ace Race Parts offers a range of options made from CNC-machined 6061 Aluminum. Their products are suitable for fuel, oil, coolant, and vacuum applications. The fittings feature a double PTFE O-ring design, ensuring a leak-proof seal, and are finished with a durable black hard-anodized coating for both durability and a sleek look.
Additionally, the Ace Race Parts brand offers hose end fittings in various configurations and sizes, ranging from 4AN to 20AN. These fittings can be paired with their Stainless Steel Braided or Nylon Braided Flexible Race Hoses, which are compatible with E85 and safe for use in fuel, coolant, and vacuum systems. It is recommended to use high-quality fittings and hoses to ensure the performance and longevity of your LS swap project.
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Frequently asked questions
LS swap involves installing an LS engine into an older vehicle.
There are various fuel line options for LS swap, including:
- Hot Rod fuel hose's AN6 fuel line kit
- Evil Energy fuel hoses
- PTFE 6AN line
- XRP crimped lines
Fuel pump options for LS swap include:
- In-line pump
- In-tank pump
When choosing a fuel line for LS swap, it is important to consider the engine setup, the type of fuel pump, the fittings and adapters required, and the fuel pressure regulator. It is also essential to ensure that the correct filters are installed pre-pump and post-pump to protect the pump and fuel system from debris.
