Mercedes Mullins
Swapping out a Jeep CJ engine for an LS motor is a popular modification, but it requires a number of new parts, including a new radiator, motor mounts, and exhaust headers or manifolds. It also requires hoses, wiring, power steering hoses, transmission adapter, flywheel, fuel pump, and lines. LS swap fuel line size is a common question, with some Jeep owners noting that the pressure line size is 3/8. Evil Energy sells a 20ft hose for the return line, while others recommend Fragola from Jegs.
Explore related products
$96.99 $102.99
What You'll Learn
LS Swap fuel lines
When it comes to LS Swap fuel lines for a Jeep CJ, there are a few things to consider. Firstly, it's important to determine the specific engine configuration you are working with, as different LS engines have varying fuel system requirements. For example, if you are planning to keep the LS as an EFI, you will need a high-pressure fuel system, which includes a fuel pump and lines.
Secondly, the fuel line setup of your Jeep CJ will play a role in the modifications needed. Some Jeep CJs have a single fuel line, while others may have multiple lines, such as evap, pressure, and return lines. In some cases, adapters or modifications may be required to connect the Jeep's fuel lines with the LS engine's fuel rail. It is recommended to seek advice from online forums or specialists who have experience with similar swaps.
In terms of specific fuel line sizes, there are various options available depending on the LS engine and Jeep CJ configuration. For instance, a 6AN pressure line can be used, along with a short return line as suggested by some Jeep enthusiasts. The pressurized line typically runs from the frame at the firewall to the LS, requiring a shorter line. The return line can be installed in the fuel tank, and you can use a barb to 6AN, followed by a hose, and then a 5/16" to 6AN at the return rail.
Additionally, it is worth noting that the LS Swap can be costly, especially if you are starting with a working 350 engine setup. The radiator, motor mounts, and exhaust can be reused in some cases, but you will likely need new fuel lines, along with other components such as a new radiator, hoses, wiring, power steering hoses, and more. It is recommended to carefully plan and research the specific requirements for your LS Swap to ensure a successful and cost-effective project.
Fuel Line Size: Carburetor Performance and Efficiency
You may want to see also
Explore related products
LS Swap fuel sending unit
When performing an LS swap in a Jeep CJ, there are a number of considerations to make regarding the fuel system. Firstly, the LS engine will require a high-pressure fuel system if it is an EFI (Electronic Fuel Injection). This will include a fuel pump, lines, and potentially a new fuel sending unit.
The stock Jeep TJ fuel sending unit is a single-line setup, while the LS engine typically uses a two-line setup. This means that adapters or modifications are necessary to make the LS engine work with the Jeep's fuel system. One option is to use an adapter kit, such as the one offered by Novak, which allows you to install a return line in the fuel tank. This kit can be pricey, but it provides a straightforward solution to the issue.
Another option is to use a return-style fuel rail, such as the one mentioned by a user with a Chevy engine. They used the return line as the pressure line and ran a new line for the return, matching the size of the Chevy engine. This solution may require some creativity in terms of line routing and connections.
Additionally, when performing an LS swap, you may encounter issues with the fuel gauge reading inaccurately or becoming stuck. This could be due to wiring issues or the fuel buffer module, and troubleshooting these problems can be complex.
Finally, when choosing a fuel sending unit for an LS swap, there are options available specifically designed for this purpose, such as the Spectra Premium Squarebody 1987+ Sending Unit for LS and EFI. This unit allows you to install an EFI-ready pump into your fuel tank and is compatible with GM sending units.
In conclusion, when performing an LS swap in a Jeep CJ, there are several options for addressing the fuel sending unit and fuel system as a whole. It is important to carefully consider the specific engine configuration, budget, and technical expertise required for each option before proceeding.
Fuel Line Sensors: Understanding Their Function and Importance
You may want to see also
Explore related products
LS Swap cost
The LS swap cost for a Jeep CJ can vary depending on several factors, including whether you plan to perform the swap yourself or hire a professional, the specific parts and components required, and the desired level of performance and customization.
If you choose to pay a professional for the LS swap, it can cost upwards of $20,000 by the time the project is completed. This cost takes into account various components that need to be replaced or upgraded, such as a new radiator, hoses, wiring, power steering hoses, motor mounts, transmission adapter/flywheel, exhaust, fuel pump, and fuel lines. Additionally, if you opt for an EFI (Electronic Fuel Injection) system, you will need to budget for an ignition and computer system, as well as a high-pressure fuel system.
On the other hand, if you decide to tackle the LS swap yourself, you can source parts and components individually or opt for kits that provide many of the necessary items. For example, PSI offers standalone wiring harnesses for GM Gen II, III, IV, & V LS/LT-based engines, which include various engine and transmission combinations. These harnesses range in price, with some starting at $1,099 and others at $1,379, depending on the engine year and specific requirements.
Another cost consideration is the fuel sending unit. While some forum users suggest that the factory Jeep sending unit is sufficient, others recommend purchasing a kit to adapt the fuel system, which can be an additional expense. For example, one user mentions a fuel pump module adapter kit that is "not cheap" but is a good option.
When it comes to fuel lines, there are different approaches depending on the specific Jeep model and LS motor combination. Some forum users mention using Evil Energy hoses, which are 20ft long and suitable for return lines, while others suggest using Russell fittings. The size of the fuel lines and the method of connecting them to the LS fuel rail may vary, and it is recommended to consult forums and videos for specific guidance.
In summary, the LS swap cost for a Jeep CJ can vary significantly, ranging from a few thousand dollars for individual parts to upwards of $20,000 if hiring a professional for a comprehensive swap. The final cost will depend on the specific choices made regarding parts, labor, and desired performance and customization.
Fabricating Custom Fuel Lines: How Much Does It Cost?
You may want to see also
Explore related products
LS Swap motor variations
When considering an LS Swap, it is important to weigh the benefits of fuel injection versus a carburetor. While some prefer the tuneability and reliability offered by fuel injection, others may opt for a carburetor setup for its simplicity and self-tuning capabilities. The choice between fuel injection and a carburetor also impacts the need for additional components, such as a computer and ignition system for fuel injection.
The transmission and adapter kits are crucial aspects of an LS Swap. The SM465 and NV4500 transmissions are commonly mentioned, with the latter being recommended for highway driving. Adapter kits, such as those offered by Advance Adapters and Novak, are essential for a successful swap, providing components like flywheels, clutch kits, and transmission mounts.
Motor mounts are another consideration, with options available from various manufacturers, including Novak and Edelbrock. It is important to choose motor mounts that fit your specific engine and chassis configuration. Additionally, the radiator is an important component, and companies like Advance Adapters offer radiators specifically designed for Jeep CJ swaps with Gen 3/4 LS motors.
The LS Swap community is quite active, with numerous forums and resources available online. When planning an LS Swap, it is beneficial to consult these forums for advice, parts recommendations, and real-world experiences from other Jeep CJ owners who have undertaken similar projects.
Plastic Fuel Lines: OMC Cobra's Essential Component
You may want to see also
Explore related products
LS Swap transmission
When it comes to LS Swap transmissions, there are a few things to consider. Firstly, it's important to determine whether you plan to rebuild an existing engine or swap it out for an LS motor. This decision will impact the overall cost and the specific parts required. For example, if you choose to keep the LS as an EFI, you'll need to invest in additional components such as ignition and a computer system.
Another factor to consider is the type of transmission you plan to use. Some Jeep CJ owners have opted for a manual transmission, such as the T176, which can be successfully retained in a GM engine conversion. However, if you're looking for something with an overdrive for highway driving, the NV4500 is a popular choice. Additionally, when adapting the LS1 to the SM465 transmission, a kit from Advance Adapters that includes a new flywheel and clutch kit is recommended by some CJ owners.
The stock Dana 300 transfer case found in CJ Jeeps is adaptable to a range of transmissions and is known for its strength, quiet operation, compactness, and longevity. However, some CJ owners have chosen to upgrade to a 4L60 or other electronic transmission options for improved performance. It's worth noting that the choice of transmission will depend on your specific needs and how you plan to use your Jeep CJ.
When it comes to the cost of an LS Swap, the price can vary significantly. If you're planning to pay someone to perform the swap, it could cost upwards of \$20,000. However, if you're mechanically inclined and choose to do it yourself, you may be able to save on labour costs but will still need to factor in the price of the engine, transmission, and any other necessary components.
Lastly, it's important to carefully select the right motor mounts for your LS Swap. Some CJ owners have reported that certain motor mounts can be expensive and bulky, so it's worth considering different options or adjustable mounts to ensure a proper fit.
Fuel Line Configuration: Homelite 4620 Chainsaw Guide
You may want to see also
Frequently asked questions
LS swap refers to the process of installing an LS motor into a Jeep CJ.
The size of the fuel line will depend on the specific Jeep model and LS variation. However, some common sizes mentioned in forums include 5/16", 3/8", and 6AN.
In addition to the fuel pump and lines, other components that may need to be replaced or adapted include the radiator, motor mounts, exhaust headers or manifolds, transmission adapter, and ignition and computer systems if the LS is an EFI.
There are several online forums and communities dedicated to Jeep CJ modifications, including Jeep-CJ.com, JeepForum.com, WranglerForum.com, and WranglerTJForum.com. These forums provide a wealth of information and first-hand accounts from individuals who have performed LS swaps in their Jeep CJs.
