Choosing the right fuel tech LS kit is essential for reliable EFI conversions and LS engine swaps. This guide highlights five popular kits designed for LS-based systems, focusing on 6AN and PTFE/nylon braided lines, inline regulators, and compatible fuel filters. Read on to understand how each kit addresses pressure needs, compatibility, and durability across common fuel types. The listed products are chosen for compatibility with LS swaps, EFI setups, and high-temperature/high-pressure operation.
| Product | Brand | Key Focus |
|---|---|---|
| EVIL ENERGY 6AN Fuel Line Kit with LS Swap Fuel Filter Regulator 58PSI | EVIL ENERGY Store | 58 PSI regulator, LS swap-ready |
| FiTech FIT70090 Ultimate Rebel LS 750HP EFI System | FiTech | High horsepower EFI system |
| 6AN 25FT PTFE Fuel Line Kit, AN6 LS Swap | BRIFITOR Store | PTFE, E85 compatibility, long length |
| EVIL ENERGY 6AN 3/8″ PTFE LS Swap EFI Fuel Line Kit | EVIL ENERGY Store | PTFE nylon braided, LS-focused |
| EVIL ENERGY 58 PSI Fuel Filter Regulator | EVIL ENERGY Store | 58 PSI regulation, inline regulator |
EVIL ENERGY 6AN LS Fuel Line Kit With Filter Regulator
Designed for LS engine swaps and EFI conversions, this 6AN braided fuel line kit includes a built-in regulator that maintains a steady 58 psi output. The kit’s stainless steel braided hose supports high pressure (up to 750 psi working; 2250 psi bursting) and a wide temperature range designed to handle extreme operating conditions from -22°F to 248°F. The included LS-compatible fuel filter regulator features a built-in 10 micron element to keep fuel clean before it reaches the engine, helping to extend engine life and reduce fuel variability during startups and high-load operation.
Key considerations for this kit include its broad compatibility with gasoline and diesel (not for E85), the robustness of the 6AN fittings, and the emphasis on a regulated 58 psi fuel supply ideal for LS EFI systems. It’s well-suited for enthusiasts performing LS swaps who need a comprehensive, ready-to-install solution that reduces risk of fuel pressure fluctuations during peak power demands.
FiTech FIT70090 Ultimate Rebel LS EFI System
The FiTech FIT70090 Ultimate Rebel LS 750HP EFI System is a complete solution for high-performance LS builds. While it’s designed for substantial horsepower targets, its EFI-centric architecture focuses on precise fuel delivery, robust control, and reliability across varying load conditions. The system emphasizes easy tuneability, fast response, and compatibility with a wide range of LS applications, including swapped LS engines in traditional platforms. Users should consider installation space, compatibility with existing fuel pumps, and required ECU integration when evaluating this kit for mid to high-horsepower builds.
Key aspects include its capability to support up to 750 horsepower in EFI configurations, its emphasis on reliable fuel metering, and the integration required with control hardware. This kit is ideal for LS swaps that prioritize modern EFI reliability and easier calibration, rather than a minimal-install, budget-focused approach.
6AN 25FT PTFE Fuel Line Kit With AN Fittings
This 25-foot 6AN PTFE fuel line kit is built for durability and versatility in LS EFI systems. The outer Nylon/Stainless Steel braided jacket provides resistance to chemicals, while the PTFE inner lining supports high temperature and high-pressure operation. The kit includes 26 pieces of fittings plus a wrench tool for easier installation. With an internal ID of 0.31″ (8 mm) and an OD of 0.44″ (11.3 mm), it’s designed for tight engine bays and flexible routing. It operates across a broad temperature range from -76°F to 446°F and supports up to 3,000 PSI working pressure, with a 10,000 PSI bursting rating, making it suitable for high-performance LS EFI and related systems.
Considerations include the kit’s E85 compatibility and broad applicability across EFI LS systems, transmission lines, and even cooling and hydraulic lines where PTFE lines are appropriate. The included hose and fittings enable robust installations in demanding environments, but measuring for proper fitment is suggested before purchase because tubing IDs and ODs can vary across kits.
EVIL ENERGY 6AN 3/8″ PTFE LS Swap EFI Kit
This PTFE-based LS swap EFI fuel line kit from EVIL ENERGY uses 6AN nylon braided hose with PTFE for superior chemical resistance and heat handling. It’s designed for a wide range of high-temperature and high-pressure applications in EFI LS systems, including fuel injection, LS engine swaps, turbo oil feeds, and return lines. The kit specifies an ID of 5/16″ (0.31″) and an OD of 0.45″ (11.3 mm). Operating temperatures range from -76°F to 446°F, with a maximum working pressure of 1,500 PSI and a bursting pressure of 4,500 PSI, making it a strong choice for aggressive EFI builds. It’s noted for compatibility with petrol, diesel, oil, hydraulic fluids, E85, coolant, and other fuels, broadening its potential uses beyond pure fuel lines.
When selecting this kit, ensure space and routing accommodate the line’s size, and verify that the 3/8″ nominal fitting diameter matches your system’s fittings. It suits LS EFI projects that demand a robust PTFE option with reliable high-pressure performance and wide fuel compatibility.
EVIL ENERGY 58 PSI Fuel Filter Regulator
This inline fuel filter regulator maintains 58 psi of fuel pressure for LS EFI systems, featuring an internal bypass and a built-in 10-micron fuel filter element. The regulator helps protect the engine by delivering clean fuel and preventing pressure spikes that can occur during cold starts or high-demand scenarios. The inline pump compatibility supports various LS-based engines and a range of external pump configurations, with a flow test range of 200-300 LPH depending on electrical conditions. This regulator is designed for use with 12V electrical systems and works with gasoline, diesel, and similar fuels.
Key considerations include ensuring the external pump’s capacity aligns with the regulator’s flow rate, and confirming the regulator’s fitting sizes match the rest of the fuel system. It’s a practical option for LS EFI builds seeking stable pressure regulation without complex electronic controls, and it can be integrated with existing external pumps to support enhanced fuel delivery for higher-performance applications.
Buying Guide: Key Purchase Considerations
- Fuel type compatibility: Confirm whether the kit is suitable for gasoline, diesel, or E85. Many PTFE/nylon braided lines tolerate a wide range of fuels, but some have limitations with E85 or ethanol blends.
- Pressure ratings: Assess maximum working pressure and bursting pressure to ensure the kit can handle peak engine demand, especially in high-horsepower builds.
- LS compatibility: Ensure the kit supports LS engine swaps and EFI configurations, including the correct hose sizing and hose end fittings for your installation.
- Temperature range: High-performance LS EFI systems may experience extreme temperatures. Choose hoses and regulators rated for low to high temperatures to avoid cracking or flow changes.
- Material and durability: PTFE-lined hoses with nylon or stainless-steel braiding offer chemical resistance and abrasion protection, but check for compatibility with your fuel and environment.
- Regulation and filtration: Inline regulators and 10-micron filters help maintain consistent fuel pressure and clean fuel delivery. Verify compatibility with your pump and ECU.
- Installation space: Some kits are long and require more routing room. Measure available space in the engine bay to avoid interference with headers, belts, and components.
- Maintenance and serviceability: Look for components with standard fittings and widely available replacements to simplify future maintenance.
- Ease of installation: Complete kits with included fittings, wrenches, and clear instructions reduce install time and potential leaks.
In sum, choosing the right LS kit involves balancing hose construction, pressure specifications, and LS-specific compatibility with the rest of the EFI system. For high-performance builds, PTFE-based lines paired with a precise inline regulator can provide stable fuel delivery and resilience against high temperatures and pressure spikes. For more budget-conscious or mid-range builds, braided hoses with solid regulator integration still offer dependable performance. Consider your horsepower target, fuel type, and installation constraints to select the most suitable kit.