Find the right in-tank fuel pump conversion kit for your LS swap, EFI upgrade, or returnless fuel system. This guide highlights five robust options and explains who each is best for, plus practical limits to consider. Ideal buyers include DIY LS swap builders, street/drag enthusiasts, and those upgrading to higher-flow fuel delivery.
Summary table of selected products:
| Product | Best For | Key Benefit | Potential Limitation |
|---|---|---|---|
| Yinlowa 255LPH Inline Fuel Pump Kit | Returnless LS setups | Fixed 58 PSI with integrated filter | Custom plumbing required |
| 450LPH Fuel Pump Hanger & Sending Unit | Classic GM trucks with LS/LT swap | Hanger and sending unit combo | Vehicle compatibility check needed |
| EVIL ENERGY 58 PSI External Regulator + 300LPH Pump | LS swaps needing stable 58 PSI | High flow and clean fuel with 10-micron filter | Designed for LS engines; verify rail fit |
| EVIL ENERGY 255LPH EFI Pump Kit | 12V EFI systems, moderate flow | Wide operating range (15-90 PSI) | Gasoline-only |
| Aeromotive Phantom 340 In-Tank Pump System | EFI or carbureted return systems | High flow in-tank option | Universal fit requires tank specs |
Yinlowa 255LPH Inline Pump Kit for LS Returnless EFI
The Yinlowa kit uses a fixed 58 PSI regulator to feed a returnless LS fuel rail, with an integrated filter to trap contaminants before injection. It is designed for custom EFI plumbing rather than universal bolt-on installs. Best for builders wiring a dedicated 58 PSI LS returnless system in Gen III/IV swaps.
Who it’s best for: a DIY LS swap builder seeking a compact, inline solution near the tank with a return line. Why chosen: stable 58 PSI helps maintain rail pressure and reduces regulator adjustments. Limitation: verify rail, hose sizes, and plumbing layout before purchase.
450LPH Fuel Pump Hanger & Sending Unit
This unit provides a complete hanger and sending unit solution for 73-91 Chevy/GMC C/K trucks and LS/LT swap projects. It supports gasoline and E85 with durable aluminum/stainless construction and includes leak-free fittings. Best for classic trucks undergoing an LS-based upgrade.
Who it’s best for: truck enthusiasts upgrading to LS/LT while retaining stock-looking fuel delivery. Why chosen: integrated hanger simplifies installation. Limitation: ensure your tank opening and fitting sizes align with the kit.
EVIL ENERGY 58 PSI Regulator with 300LPH Pump
The EVIL ENERGY kit pairs a 58 PSI regulator with a 300LPH external pump. It’s designed for LS swap EFI conversions and is capable of operating up to 75 PSI with a wide temperature range. Best for engines needing strong flow with stable pressure. Limitation: regulator and pump compatibility should be matched to rail and hose hardware.
EVIL ENERGY EFI 255LPH Pump Kit
This 255LPH EFI pump kit operates in a 12V DC system with a regulator to set final pressure from 15 to 90 PSI. It focuses on gasoline delivery and highlights that higher-impurity fuels can reduce pump life. Best for moderate-flow EFI upgrades. Limitation: gasoline-only compatibility.
Aeromotive Phantom 340 In-Tank Pump System
The Aeromotive Phantom 340 in-tank kit is designed for EFI and carbureted return-style systems. It supports high flow in-tank pumping and is adaptable to universal tank sizes with ORB-06 ports. Best for high-demand setups or return-style builds. Limitation: installation requires compatible tank geometry.
Buying Guide
What to consider when choosing an in-tank fuel pump kit:
- System type: Returnless LS systems typically benefit from a regulator-supported inline pump, while return-style systems may use standalone pumps or hangers.
- Flow and pressure: Match pump flow (LPH) and regulator pressure to your engine’s horsepower and rail demands. Higher flow is not always better if your system can’t utilize it efficiently.
- Tank compatibility: Tank size, port fittings (AN sizes, ORB ports), and clearance determine fit. In-tank units require adequate space and compatibility with the sender.
- Fuel compatibility: Ensure the kit supports your fuel (gasoline, E85) and environmental conditions. Some units are gasoline-only or rated for wide temperatures.
- Installation complexity: Some solutions are complete hangers with sending units, while others are inline kits requiring additional plumbing and pre-filters.
- Maintenance and filtration: Integrated filters help protect injectors, but filter replacement intervals depend on fuel quality and system cleanliness.
Frequently Asked Questions
- What does a 58 PSI regulator do in an LS returnless fuel system?
- Are inline pumps suitable for all LS swap projects?
- Can I upgrade fuel pumps without changing the fuel rails?
- What maintenance is needed for in-tank fuel pump kits?
- Do I need a pre-filter with these pumps?
- Which kit is best for a daily driver versus a performance build?