5 Best In Tank Fuel Pump for LS Swap

Swapping an LS engine into your classic truck or car is an exciting project, but it demands a reliable fuel delivery system. An in-tank fuel pump designed for LS swaps ensures consistent pressure and flow, whether you’re building a daily driver or a high-horsepower street machine.

This guide reviews five top options to help you choose the best in-tank fuel pump for your LS swap. We’ll cover fitment, flow rates, and key features so you can make an informed decision without guesswork.

Aeromotive 340 LPH – Reliable High-Flow Pump

The Aeromotive 340 LPH In-Tank Fuel Pump delivers impressive high-flow output, pushing over 340 liters per hour at 40 PSI. This makes it an excellent choice for demanding EFI setups, whether naturally aspirated, turbocharged, or supercharged. Its compact OEM-style 39mm body fits specific in-tank hanger assemblies, so you should check compatibility before ordering.

Built with a durable turbine design, this pump ensures smooth, reliable in-tank operation and works with gasoline and E85. The 12V electric unit is engineered to support high-output engines without voltage drop issues. If you need a proven pump for serious horsepower in a carbureted or EFI system, this is a solid option worth considering.

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• SUPERIOR HIGH-FLOW OUTPUT: High-performance in-tank fuel pump delivers over 340 LPH at 40 PSI, supporting demanding EFI and carbureted fuel system setups
• APPLICATION-SPECIFIC FITMENT: Compact OEM-style 39mm pump body designed for select in-tank hanger assemblies; reference the Aeromotive application catalog to confirm proper vehicle compatibility
• SUPPORTS HIGH-OUTPUT ENGINES: 12V electric fuel pump engineered to deliver increased fuel volume for naturally aspirated, turbocharged, and supercharged engines with consistent performance across a wide pressure range
• DURABLE TURBINE DESIGN: Turbine-style design provides reliable in-tank operation & smooth fuel delivery; compatible w/ gasoline & E85 fuels. Suitable for pulse-modulated or constant-voltage systems
• INSTALLATION KIT INCLUDED: Complete fuel pump kit includes universal filter sock, wiring pigtail, rubber hose, clamps, and grommet for streamlined installation

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Lanotech 340LPH Hanger – Square Body Ready

The Lanotech 340LPH Fuel Pump Hanger is a complete plug-and-play solution for 1973-1991 Chevy and GMC Square Body trucks swapped with LS or LT engines. It includes a sending unit and is pre-wired with a 14-gauge pigtail and adapter harness for EP381-style pumps, eliminating messy splices inside your tank. The hanger features a -6AN fitting for secure fuel line connections.

Rated at 58 PSI, this kit delivers the pressure your EFI engine needs without using compression fittings. It fits C10, K10, C20, K20, Blazer, and Suburban models. If you’re tackling a classic truck LS swap, this complete hanger assembly simplifies installation and improves reliability from the start.

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• Compatible with EFI LS or LT (L83/L86/LT1) swapped Square Body trucks 1973-1991, including C10, K10, R10, C20, K20, R20, C30, K30, R30, V10, V20, V30 – rated at 58psi.
• Eliminate failure prone splices and solder joints inside the fuel tank
• Safely LS/LT swap your Square Body pickup without using compression fittings
• Wiring: 14 gauge 255LPH pigtail included. Plug and play adapter harness included for use with EP381 style fuel pumps
• 【340LPH High Flow + Fuel Sending Unit】 Complete assembly with integrated fuel level sending unit and -6AN fitting hanger. Plug-and-play design for 1973-1991 Square Body trucks—no modifications needed.

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OSIAS TBI Fuel Pump – Simple LS Swap Solution

The OSIAS Fuel Pump is a direct drop-in replacement for all 1982-1995 GM TBI fuel pump hangers, making it perfect if you’re swapping an LS engine (like LM7, LR4, LQ4, LQ9, L33) into a GM TBI truck, van, or SUV. It provides the critical 58 PSI fuel pressure required by all LS engines without overloading your factory wiring or overpowering stock pressure regulators.

This pump delivers 160 LPH flow, which is suitable for mild to moderate builds. You’ll need a C5 Corvette regulator/filter or a rail-mounted regulator to set pressure correctly. If you have a TBI vehicle and want a simple, reliable in-tank upgrade for your LS swap, this pump is a hassle-free choice.

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• Undertaking an LS series engine swap on a GM TBI truck, van or SUV? This pump will not overload factory wiring nor will it overpower OE pressure regulators. Compatible with all LS series motors; LM7, LR4, L33, LC9, LQ4, LQ9, L92, LS1, LS2, LS6, etc. Direct replacement AC Delco EP381.
• Design: Intank EFI Fuel Pump, Pressure: 58PSI (fuel pressure set by using C5 Corvette regulator/ filter or rail mounted regulator found on 2002 and earlier fuel rails), Flow: 160LPH, Flow: 164LPH, Draws 4.6 Amps @ 45psi, Flow: 145LPH, Draws 5.1 Amps @ 60psi
• Direct drop-in for all 1982-1995 GM TBI fuel pump hangers
• Provides 58psi fuel pressure required by all LS Engines
• DIMENSIONS: Overall Length: 5", Length of Pump Body Metal Case: 3 3/8", Pump Body Diameter: 1 1/2", Inlet Diameter: 3/4", Outlet Diameter: 3/8"

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EVIL ENERGY Kit – External Fuel Delivery

The EVIL ENERGY 58 PSI Fuel Filter Regulator with External High-Flow 300LPH Electric Inline Pump is a complete kit designed for LS swap EFI conversions. It includes a precision regulator that maintains 58 PSI and an integrated 10-micron filter to keep fuel clean. The external pump delivers up to 300 LPH at 13.5V, supporting high-horsepower applications.

This setup is compatible with 1999-2014 Chevy V8 engines (4.8L, 5.3L, 6.0L LS-series) and runs on 12V DC. The regulator is best mounted in the engine bay for easy adjustments. While it requires some fabrication for pump mounting, this all-in-one kit simplifies fuel delivery for those who prefer an external pump rather than in-tank.

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• Precise Fuel Control for LS Engine Performance​: EVIL ENERGY LS swap regulator maintains optimal fuel pressure at 58 PSI. The integrated 10-micron filter element ensures clean fuel reaches your engine, protecting it and enhancing performance and longevity.
• High-Flow 300LPH Inline Electric Fuel Pump​: EVIL ENERGY external pump delivers a maximum flow of 300 LPH (at 13.5V) to support high-horsepower applications. It operates reliably under pressure (up to 75 PSI) and across a wide temperature range (-68°F to 194°F).
• Wide Compatibility for Easy EFI Upgrades​: Designed for 1999-2014 Chevy V8 engines (4.8L, 5.3L, 6.0L LS-series). The fuel pump is for 12V DC electronic fuel injection (EFI) systems, and the regulator and pump are compatible with gasoline and diesel fuels.
• Installation Flexibility & Complete Kit​: The regulator is ideal for engine bay mounting to stabilize pressure. The pump is designed for below-tank mounting to use gravity-fed fuel supply. Includes all necessary fittings, adapters, and a mounting bracket for a streamlined installation.
• Package Includes Everything You Need: 1x 58 PSI Fuel Filter Regulator, 1x 300LPH External Fuel Pump, 1x Fuel Pump Bracket, 1x M12x1.5 to AN6 Adapter, 1x AN10 to M18x1.5 Adapter, 1x AN6 to 5/16" Quick Disconnect, 2x AN6 to 3/8" Quick Disconnects, 1x AN6 to 3/8" EFI Quick Disconnect Fitting.

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Lanotech 450LPH Hanger – High-Flow Square Body

The Lanotech 450LPH Fuel Pump Hanger & Sending Unit is built specifically for 1973-1991 Chevy and GMC Square Body trucks, including C10, K10, Suburban, and Blazer models. It comes pre-assembled with a 9-95 ohm fuel level sending unit and AN fitting hanger, making installation straightforward for LS or LT swaps. The 450 LPH pump can support high-horsepower engines, making it ideal for serious performance builds.

All rubber and pump components are compatible with gasoline and E85, so you can run flex-fuel setups without worry. If you’re building a high-power LS-swapped Square Body truck and need a robust in-tank solution with accurate fuel level readings, this complete kit delivers both flow and convenience.

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• Direct Fit for 1973-1991 Chevy & GMC Square Body Trucks Specifically engineered for C10, K10, C20, K20, C30, K30, Suburban, and Blazer models. Perfect for LS/LT engine swaps (LS1, LS3, LS7, LT1, L86, etc.) – requires no modifications to your factory fuel tank.
• E85 & Gasoline Compatible All rubber and pump components are fully compatible with standard gasoline, E85, and other ethanol-blended fuels. Ideal for flex-fuel conversions and high-performance builds.
• 450LPH High-Flow Performance Fuel Pump Equipped with a 450 liters-per-hour electric pump capable of supporting high-horsepower LS/LT engines. Works with popular high-performance 450 LPH pumps (pump included).
• Complete Plug & Play Kit Comes pre-assembled with AN fitting hanger, 9-95 ohm fuel level sending unit, and submersible high-pressure hose. Includes a plug-and-play wiring harness adapter for EP381 style pumps – install in under 2 hours.
• Safe & Leak-Free AN Fittings Features -6 AN male fittings for secure, leak-proof connections, eliminating unreliable compression fittings. Built from durable aluminum and stainless steel for long-lasting performance in harsh environments.

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Buyer’s Guide: What to Consider

Choosing the right in-tank fuel pump for your LS swap depends on horsepower goals, fuel type, and vehicle compatibility. Here are key factors to consider.

• Flow Rate: Match pump flow (LPH) to your engine's power level: 340 LPH supports up to ~650 hp, while 450 LPH handles 800+ hp.
• Drop-in Fitment: Ensure the pump fits your OEM or aftermarket hanger; some pumps are direct drop-ins for specific TBI hangers (1982-1995 GM).
• Fuel Compatibility: If you plan to use E85, verify pump and rubber components are ethanol-compatible to avoid corrosion or swelling.
• Pressure Regulation: LS engines require a consistent 58 PSI; choose a pump with a regulator or that works with your existing regulator setup.
• Hanger Integration: Pre-assembled hanger kits with AN fittings and sender simplify installation and reduce leak points inside the tank.

Conclusion

Upgrading your fuel system is a critical step in any LS swap. The right in-tank pump ensures consistent fuel delivery and reliability under high demand.

For most builds, the Aeromotive 340 LPH or a complete Lanotech hanger kit provides a perfect balance of performance and easy installation.