If you’re upgrading an LS-based engine with EFI, a complete EFI conversion kit helps you deliver reliable fuel pressure and a clean fuel path. This guide focuses on five top kits that pair well with LS swaps, offering 58 PSI regulator capability, AN fittings, and ready-to-install components. Ideal buyers include DIY enthusiasts replacing carbureted systems, builders pursuing reliable EFI fuel delivery, and LS swap projects looking for an all-in-one solution. Below is a quick buying table and a detailed section for each kit to help you decide.
| Product | Best For |
|---|---|
| SENJWARM 58 PSI Fuel Filter Regulator Kit | Complete kit for LS swap users needing a regulator, inlet/outlet fittings, and return line |
| EVIL ENERGY LS Swap 58 PSI Kit | EFI LS systems requiring PTFE hose and a 58 PSI regulator |
| LLANNDER 58 PSI Kit | Full LS swap solution with mounting bracket and rubber insulator |
| ZHSYMX 58 PSI Kit | All-in-one regulator with return line and mounting hardware for 1999-2014 LS engines |
| Plobeda 6AN Line Kit | Extended hose length with multiple push-lock fittings for C5 Corvette conversions |
SENJWARM 58 PSI Fuel Filter Regulator Kit
The SENJWARM kit targets LS-based engine swaps needing a 58 PSI regulator plus essential adapters. It includes a fuel filter/regulator, inlet and return fittings, and a 6AN/3/8″ inlet and 5/16″ return components. This option is best for builders who want a ready-to-install package with broad part-number compatibility for many LS engines. Caution: verify that your exact LS model and return path align with the included fittings before purchase.
EVIL ENERGY LS Swap 58 PSI Kit
This kit provides a 58 PSI regulator with a built-in 10-micron fuel filter and PTFE hose kit designed for EFI LS systems. It is well-suited for engines requiring clean fuel delivery and compatibility with various fuels (gasoline, E85). Best for projects that want a robust PTFE hose option alongside a standard regulator. Limitation: check hose length and connector compatibility with your fuel rail before installation.
Edelbrock 36032 Fuel Sump
Designed to deliver high fuel pressure for EFI systems, Edelbrock’s fuel sump is a self-contained kit that supports 49 psi, 60 psi, or fully adjustable settings without a return line. It suits builds where a compact, under-hood EFI solution is preferred. Best for users who need a dedicated pressure source rather than a full-regulator kit. Caution: not a direct regulator replacement for all LS-based engines; ensure compatibility with your rail and return strategy.
Holley EFI CAN Input/Output Module Kit
This module extends Holley EFI capabilities by expanding input/output channels, useful for complex EFI installations such as Dominator or Terminator X systems. It’s best for builders who need additional data channels and control outputs to monitor and manage more EFI functions. Limitation: this is an expansion accessory, not a standalone regulator or fuel line kit.
EVIL ENERGY LS Swap 58PSI With 6AN 25Ft Hose Kit
This kit pairs a 58 PSI regulator with a 25-foot high-pressure PTFE hose, designed for LS swap EFI workflows. It includes fittings for inlet and return lines and a robust hose specification for high-temperature environments. Best for longer runs where routing distance demands extra hose. Better for builds needing flexible hose length; caution: ensure your vehicle has space for the extended hose layout.
ZHSYMX 58 PSI LS Swap Fuel Kit
The ZHSYMX kit emphasizes a complete LS swap solution with a 58 PSI regulator, return line fittings, and installation hardware. It targets users who want a turnkey setup with compatible part numbers across LS engines. Choose this if you prefer a package that mirrors OEM-compatible part numbers for easier matching. Caution: verify that the included mounting hardware fits your engine bay layout.
Buying Guide: Key Purchase Considerations
- Engine compatibility: Confirm 4.8L, 5.3L, 6.0L, or other LS variants align with the kit’s part numbers and fittings.
- Regulator pressure: Most LS EFI systems run around 58 PSI; ensure your rails and injectors are rated for your chosen regulator.
- Fittings and hoses: Check AN size, inlet/outlet diameters, and hose material (PTFE vs rubber) to match your fuel system and fuel type.
- Return vs returnless: Some kits include a return line; others are designed for returnless setups. Align with your fuel rail design and engine management.
- Physical fitment: Inspect bracketry, mounting points, and space under the hood to ensure components clear belts, hoses, and firewall routing.
- Durability and materials: PTFE hoses offer high-temperature and chemical resistance but may require special clamps; rubber hoses are simpler but less heat resistant.
Frequently Asked Questions
- What is a complete EFI conversion kit for an LS swap?
It typically includes a regulator, fuel filter, fittings, hoses, brackets, and sometimes a pump or fuel sump, designed to convert a carbureted or returnless system to EFI. - Do I need a return line with these kits?
Some LS EFI systems use a return line; others are designed for returnless setups. Check your engine rail and management system requirements. - Is 58 PSI the standard for LS EFI fuel systems?
58 PSI (4 BAR) is common for many LS EFI configurations, but always verify compatibility with your injectors, rail, and ECU. - Can I mix parts from different kits?
Yes, as long as inlet/outlet sizes and fittings match your fuel rail and lines. Ensure mechanical fit and pressure ratings. - What should I consider before buying a long hose kit?
Long hoses add routing flexibility but require careful mounting to avoid heat sources or movement that could stress fittings. - Are these kits suitable for all LS engine displacements?
Most kits target common LS-based engines (4.8L–6.2L). Verify exact engine model compatibility in the product details.