An LS swap is one of the most rewarding projects for any enthusiast, but its success hinges on a reliable fuel delivery system. The heart of this system is the fuel pump, and choosing the right one is critical for performance and drivability. With so many options on the market, from high-flow aftermarket units to precise OEM replacements, selecting the best component can be a challenge.
This roundup focuses on AC Delco and other essential fuel system components specifically for LS swap applications. We have compiled a list of products that cover everything from complete pump modules to specialized regulators and sensors. Whether you’re building a high-horsepower beast or a reliable street cruiser, finding the right fuel pump solution is a key step in your project.
Top AC Delco Fuel Pumps for Your LS Swap
- GM Genuine Parts 16238399 Fuel Tank Pressure Sensor
- 58 PSI Fuel Filter Regulator Kit for LS Swap EFI Conversion
- KEMSO 340LPH High Performance Fuel Pump
- 255LPH Electric Fuel Pump High Performance Replace Walbro GSS341
- Universal Electric Fuel Pump Kit 12v 3-6 PSI Low Pressure
- ACDelco GM Original Equipment MU1613 Fuel Pump and Level Sensor Module
- GM Genuine Parts MU1474 Fuel Pump and Level Sensor Module with Seal
- ACDelco GM Original Equipment 25184041 Fuel Pump Module
- ACDelco GM Original Equipment 12662739 Fuel Pump Module
GM Genuine Parts 16238399 Fuel Tank Pressure Sensor
Often overlooked but critically important, the fuel tank pressure sensor is a key part of your vehicle’s evaporative emissions system. This GM Genuine Part is designed to measure pressure changes within the fuel tank, providing essential data to the engine management computer. It helps ensure your swap is not only powerful but also compliant with emissions standards by alerting the computer if a leak occurs in the fuel system.
As a GM-recommended replacement for the original factory component, this sensor guarantees a perfect fit and reliable operation. Using this genuine part helps maintain the integrity of your fuel system’s monitoring capabilities, which is vital for both performance tuning and passing emissions inspections. It’s a small component that plays a big role in the overall system.
58 PSI Fuel Filter Regulator Kit for LS Swap EFI Conversion
This all-in-one fuel filter regulator kit is engineered specifically for LS swap EFI conversions. It delivers a consistent 58 PSI (4 BAR) to your fuel rail, which is the standard pressure required for many LS engines, and returns unused fuel to the tank. The integrated 10-micron fuel filter ensures that clean fuel is delivered to your engine, protecting vital components and extending the engine’s service life.
Compatible with a wide range of GM 4.8L, 5.3L, and 6.0L Gen III and IV engines, this kit comes with the necessary AN-6 adapter fittings for a straightforward installation. It serves as a direct replacement for numerous OEM part numbers, ensuring a proper fit. The combination of filtration and regulation in a single unit simplifies your fuel system plumbing significantly.
KEMSO 340LPH High Performance Fuel Pump
For high-horsepower LS swap builds, the KEMSO 340LPH fuel pump offers the necessary flow rate. This pump is capable of supporting applications up to 600 brake horsepower in naturally aspirated, turbocharged, and supercharged setups. Its robust design is built to handle the demands of both gasoline and E85 fuels, providing flexibility for your tuning and fuel choices.
As a high-flow alternative that replaces the Walbro 255LPH GSS341, this pump offers a significant upgrade in fuel delivery. The manufacturer provides USA-based technical support, which can be a valuable resource during your installation process. This pump is an excellent choice for enthusiasts pushing their LS engines beyond stock power levels.
255LPH Electric Fuel Pump High Performance Replace Walbro GSS341
This 255LPH electric fuel pump is a direct, high-performance replacement for the popular Walbro GSS341 model. It is a 100% new unit that has been thoroughly tested to ensure it meets or exceeds original equipment performance standards. The pump is designed for both truck and car applications that require a reliable, high-flow fuel solution.
What makes this product particularly convenient is the inclusion of a complete installation kit. The package contains not just the pump, but also a rubber hose, wire harness, rubber sleeve, foam sleeve, fuel strainer, and clamps. Having all these components together simplifies the sourcing process and helps ensure a successful installation.
Universal Electric Fuel Pump Kit 12v 3-6 PSI Low Pressure
This universal low-pressure electric fuel pump is an ideal solution for LS swaps that use a carburetor setup instead of fuel injection. Operating at 12 volts and producing 3-6 PSI, it provides the lower pressure required by carburetors. The kit is versatile and can be used for gasoline or diesel fuel, making it suitable for a variety of project vehicles.
The package includes a substantial 6.56 feet of 5/16″ ID fuel line and an integrated fuel filter, providing almost everything needed for a basic fuel delivery system. This pump is also useful as a transfer pump. It’s a simple and effective solution for getting fuel from the tank to the carburetor reliably.
ACDelco GM Original Equipment MU1613 Fuel Pump and Level Sensor Module
The ACDelco GM Original Equipment MU1613 is a complete fuel pump and level sensor module designed to deliver a reliable supply of fuel to the engine. As a GM-recommended replacement part, it matches the quality, reliability, and durability of the original factory component installed at the factory. This makes it an excellent choice for a straightforward, no-hassle replacement in a vehicle originally equipped with this module.
This module includes the seal, float, and harness, providing a comprehensive solution for a fuel pump replacement. Using this OEM-equipment part helps ensure compatibility and fitment, reducing the potential for installation issues. It is built to the same specifications as the original, offering peace of mind for a critical component.
GM Genuine Parts MU1474 Fuel Pump and Level Sensor Module with Seal
This GM Genuine Parts MU1474 module is the real deal, offering the exact same quality and performance as the part that was originally installed in your GM vehicle. It is engineered to help deliver a consistent and reliable supply of fuel to the engine, which is the foundation of good performance and drivability. The module comes complete with the necessary seal for a proper installation.
Choosing a genuine GM part eliminates any guesswork regarding fit, form, and function. It is the manufacturer’s recommended replacement, ensuring that your vehicle’s fuel system operates as intended. This is a premium option for those who prioritize factory-level quality and a direct, hassle-free fit.
ACDelco GM Original Equipment 25184041 Fuel Pump Module
The ACDelco GM Original Equipment 25184041 Fuel Pump Module is designed as a direct replacement for specific GM vehicle applications. As an ACDelco GM Original Equipment part, it is manufactured to meet the quality, reliability, and durability standards of General Motors. This ensures that it will provide the same performance as the part originally fitted to the vehicle.
Using this module helps maintain the integrity of your fuel delivery system. It is an ideal solution for a restoration or repair where maintaining OEM specifications is important. For swaps that utilize a factory fuel tank from a compatible vehicle, this module provides a dependable, plug-and-play fueling solution.
ACDelco GM Original Equipment 12662739 Fuel Pump Module
This ACDelco GM Original Equipment fuel pump module (part number 12662739) is another high-quality OEM-level component for your fuel system needs. It is engineered to be a direct fit for specific GM models, ensuring a straightforward installation process without the need for modifications. The module is built to deliver the consistent fuel pressure and volume required for optimal engine operation.
By choosing this ACDelco part, you are selecting a component that has been designed to GM’s original equipment specifications. This focus on quality control and material standards translates to a product you can depend on for the long term. It’s a solid choice for a reliable fuel pump module replacement in a compatible LS swap setup.
What to Look For in an AC Delco Fuel Pump for Your LS Swap
Choosing the right fuel pump for your LS engine swap is one of the most critical steps to ensure your project runs reliably and makes the power you want. It’s not just about bolting in any pump you find; you need to match the pump’s capabilities to your engine’s demands. I always start by looking at fuel pressure and flow rate. For a stock or mildly modified LS engine, a pump that can deliver around 58-60 PSI and flow enough fuel for your horsepower goal is key. If you’re planning for forced induction or a high-RPM build down the road, it’s smart to buy a pump that can handle more than your current setup requires.
The next big consideration is the pump assembly type. Are you replacing an in-tank pump in a factory vehicle, or are you building a custom fuel system for a swap? AC Delco offers complete assembly kits that include the pump, sender, and bucket, which are fantastic for a direct replacement in a modern vehicle that already has an internal pump. For many LS swaps into older cars, you might be using a custom fuel tank or a sump. In these cases, you’re often just buying the pump module itself, without the factory-style assembly, to install into your own custom setup. Knowing what your fuel tank situation is will point you toward the right style of pump.
Electrical compatibility is another area I pay close attention to. You need to know if your vehicle’s wiring and fuel pump controller are set up for a specific current draw. Some modern vehicles use pulse-width modulation (PWM) to control pump speed, while others use a simple 12-volt relay. Make sure the AC Delco pump you select is compatible with your electrical system to avoid premature failure or performance issues. Finally, don’t forget about the physical fit. Even if the pump flows enough fuel, you need to be certain it will physically fit inside your fuel tank or your chosen aftermarket fuel cell. A few minutes spent checking dimensions can save you a massive headache later. Getting these factors right will make your search for the 9 best AC Delco fuel pumps for LS swap applications much more effective.
FAQ
What is the best AC Delco fuel pump for a stock LS swap?
For a straightforward, stock horsepower LS swap, the AC Delco EP381 is a very popular and reliable choice. It was originally used in many late-model Camaros and Corvettes and provides the correct 58 PSI fuel pressure and sufficient flow for a stock 5.3L or 5.7L LS engine. It’s a bare pump module, so it’s perfect for installing into a custom fuel tank sump or an aftermarket fuel cell.
Can I use a factory LS fuel pump assembly in my swap?
You absolutely can, and it’s often a great way to go if you’re using a factory fuel tank from the donor vehicle. Using a complete assembly like one from a truck (such as the AC Delco MU1683) gives you the pump, fuel level sender, and the proper bucket and strainer all in one unit. This simplifies wiring and installation, as everything is designed to work together. The challenge is making the factory assembly physically fit and seal properly in a non-factory tank.
How much fuel flow do I need for my turbo or supercharged LS?
Forced induction significantly increases fuel demand. As a general rule of thumb, you’ll want a pump that can support at least 50% more horsepower than your engine is currently making. For a 600-700 horsepower boosted LS, you should be looking at pumps that can flow over 255 liters per hour (LPH). While some high-output AC Delco pumps can get you there, this is the point where many people also consider dedicated aftermarket performance pumps to ensure they have plenty of fuel headroom.
What’s the difference between a “module” and an “assembly”?
This is a key distinction. A fuel pump module is typically just the pump itself, maybe with a small bracket and a strainer sock. You buy this when you’re building a custom fuel system. A fuel pump assembly (or “sender assembly”) is the complete unit that drops into a factory tank—it includes the pump, a plastic bucket or reservoir, the fuel level float/sender, and all the mounting hardware and electrical connections for a specific vehicle.
Do I need to upgrade my fuel lines and regulator with a new pump?
It depends on your goals. For a stock-level swap using factory-style components, the original lines and regulator might be sufficient. However, if you’re increasing fuel flow significantly for performance, your stock lines can become a restriction. Upgrading to larger AN-style fuel lines and using an adjustable fuel pressure regulator gives you precise control and ensures your new AC Delco fuel pump can deliver its full potential to the engine, which is crucial for any serious LS swap applications.