When upgrading an LS-based swap, choosing a reliable in-tank fuel pump is essential for consistent pressure, ample flow, and long-term reliability. The following five products are selected for compatibility with GM TBI-to-LS swaps, LS-series engines, and EFI systems. Each option offers solid flow characteristics, regulator integration, and installation-friendly features to support high-performance needs without overloading factory wiring.
| Product | Brand | Flow (LPH) | Regulation | Notes |
|---|---|---|---|---|
| AEM 50-1000 High Flow In-Tank Fuel Pump | AEM | 340 at 40 PSI | Integrated with kit; 39 mm diameter | High output for NA or FI EFI vehicles |
| OSIAS In-Tank Fuel Pump Kit (LM7/LR4/LSx) | OSIAS | 160–164 LPH (varies with pressure) | 58 PSI regulator | Drop-in for 1982–1995 GM TBI hangers |
| QFS 100LPH Fuel Pump Kit (S10/Blazer LS Swap) | HFP | 100 LPH | 58 PSI regulator; -06AN fittings | Comprehensive retrofit kit |
| QFS OEM In-Tank Pump w/ Regulator (EP381) | HFP | High-flow; tested for reliability | Integrated regulator; peak engineering | Long service life; compatible with high-ethanol fuels |
| Yezoauto 255LPH Inline LS Swap Pump Kit | Yezoauto | 255 LPH | 58 PSI regulator | Includes install kit and 6AN fittings |
Product selections emphasize compatibility with LS engine swaps, regulator integration, and reliable in-tank performance to support modern EFI systems. Each option balances flow, electrical draw, and installation ease to suit a variety of LS-based builds.
AEM 50-1000 High Flow In-Tank Fuel Pump
AEM’s high-flow in-tank pump is designed for both naturally aspirated and forced-induction EFI setups. It is tested to flow up to 340 LPH at 40 PSI and features a 39 mm diameter to fit common applications. The kit includes a rubber sleeve, end caps, a pre-filter, hose, clamps, and wiring. It supports broad voltage input (6–18V) and is suitable for gasoline EFI engines, though life may be impacted by E85 usage. Offset inlet design facilitates easier installation in tight spaces and multiple mounting orientations.
OSIAS In-Tank Fuel Pump Kit For GM LSx Swaps
OSIAS offers a complete in-tank solution built for LS-series powertrains. The kit includes a fuel pump, filter, a 58 PSI regulator, tank seal, strainer, and installation hardware, designed as a drop-in for 1982–1995 GM TBI hangers and compatible with multiple LS variants (LM7, LR4, LQ4, LQ9, LS1, LS2, LS6, and more). It supports 58 PSI regulation and provides stable flow suitable for LS swaps without overloading OE regulators. This kit emphasizes compatibility and straightforward integration for common LS swap projects.
QFS 100LPH Fuel Pump Kit For 1994-2005 Chevy S10/Blazer LS Swap
QFS’s kit targets LS swaps on S10 and Blazer models from 1994 to 2005, offering a direct drop-in solution for 1982–1995 GM TBI hangers. It features a high-flow 100 LPH pump, a combined fuel filter/regulator set to 58 psi, and -06AN fittings for a leak-free connection to custom fuel systems. The package includes a fuel pump, strainer, tank seals, hose, clamps, a foam dampener sleeve, and a wiring harness to simplify installation in an EFI swap context.
QFS OEM In-Tank Pump Replacement w/ Regulator (EP381)
This QFS option emphasizes reliability and longevity, designed to balance volume, pressure, and turbine impeller angles to prevent overheating and promote long service life. It includes a regulator and a 10,000-hour/100,000-mile life claim under typical operating conditions, with upgraded polymers and seals for ethanol compatibility. It is suitable for all TBI to LS swaps that require a robust, regulated in-tank pump solution, ensuring stable fuel supply for high-performance builds.
Yezoauto 255LPH Inline LS Swap Fuel Pump Kit
Yezoauto’s kit centers on 255 LPH performance with an inline configuration designed for LS swaps and high-flow EFI conversions. It includes a 58 PSI EFI regulator and 6AN fittings, offering a complete install package for enthusiasts seeking strong fuel delivery in turbo or naturally aspirated applications. The kit’s emphasis on compatibility with Walbro TI GSL392 components makes it a versatile choice for modern LS builds needing reliable fuel pressure and fast response.
1PZ GSL392 Inline Fuel Pump & Regulator Kit
1PZ’s kit pairs a high-capacity inline GSL392 pump with a 58 PSI regulator and a 10-micron fuel filter. It includes 6AN fittings and is designed for LS swaps and EFI conversions, supporting turbo or high-performance street builds. The combination aims to deliver stable fuel pressure with a robust filtration layer to protect injectors and improve durability under high-demand scenarios.
EVIL ENERGY 6AN Fuel Line Kit With Regulator
EVIL ENERGY offers a 6AN braided line kit suitable for LS swaps and EFI conversions. The kit is compatible with gasoline and diesel and includes a built-in 58 psi regulator with a 10-micron filter element to ensure clean fuel reaches the engine. It supports high-pressure operations (up to 750 psi line pressure, bursting pressure 2250 psi) and is designed to withstand ethanol blends, broadening its applicability across performance builds.
Speedway Motors Deluxe AN6 Fuel Filter Regulator
Speedway Motors combines a 58 PSI regulator with a 5-micron filter in a single, integrated unit. The AN6 inlet, outlet, and return are built into the housing to simplify installation and reduce leak points. Suited for LS swaps and Holley Sniper or FiTech EFI systems, this regulator/filter combo supports up to roughly 450 HP in naturally aspirated configurations, balancing simplicity with effective fuel management for performance builds.
Buying Guide
Key purchase considerations for a tank-based LS swap fuel pump:
- Flow vs. pressure: Higher flow benefits high-performance engines, but ensure the regulator and fuel rails can handle the pressure. Match your engine’s power goals with regulator capacity (typically 58 psi for many LS builds).
- Compatibility: Confirm that the pump fits your tank hanger and is a direct drop-in for your year/model (1982–1995 GM TBI hangers are common in older swaps). Verify LSx compatibility for the chosen kit.
- Integrated regulator and filtration: Regulated systems with built-in filters reduce leak points and simplify installation. A 10-micron or finer filter helps protect injectors from debris.
- Electrical considerations: Check voltage ranges and wiring harness compatibility. Some pumps require specific wiring harnesses or relays to prevent voltage drop under load.
- Fuel type and ethanol tolerance: Some pumps perform differently with E85; select units rated for your fuel blend and revise fuel system materials accordingly.
- System completeness: Kits that include tank seals, hoses, clamps, and wiring reduce the need for extra components and facilitate a clean install.
- Durability and warranty: Look for pumps with proven reliability and manufacturers that offer warranties suitable for street and track use.
- Installation ease: Drop-in designs and pre-wired assemblies save time and minimize fabrication, especially when replacing aging or underpowered OE pumps.
Across these options, the emphasis remains on stability, compatibility with LS swaps, and robust pressure regulation. Prospective buyers should evaluate their specific engine build, fuel strategy (NA vs. forced induction), and space constraints within the fuel tank area to pick the best match.