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Welcome to our comprehensive fuel pump selection guide for LS engines and EFI conversions. Here, we'll detail everything you need to know to choose the best fuel pump for your needs.
Selecting the right fuel pump isn't just about keeping the engine running; it's about ensuring efficiency, reliability, and performance. With the correct pump, your LS or EFI-modified engine will receive the precise fuel volume and pressure required, whether cruising the streets or pushing its limits on the track.
First, we'll review the typical PSI and flow rate requirements for LS engines and then explain how to account for upgrades. Next, we'll compare the pros and cons of inline vs. in-tank fuel pumps so you know which best suits your vehicle.
Finally, we'll reveal some of the best LS fuel pump options on the market, all of which come from trusted brands known for building quality products.
Let's dive in.
How You Can Tell Which Is The Right Fuel Pump
The last thing you want is to purchase and/or install a fuel pump that can't keep up with your engine. For this reason, you must ensure that any pump you consider meets the flow rate and the fuel pressure requirements of your LS engine or EFI conversion.
Determine The Flow Rate Requirements
Flow rate, measured in liters per hour (LPH), is directly tied to your engine's horsepower.
Take, for example, an LS3 engine from 2010, which comes stock with around 430 horsepower. Using the rule of thumb that an engine requires approximately 0.5 pounds of fuel per hour per horsepower, you would need a fuel pump pushing at least 215 pounds per hour, which is roughly 195 LPH for gasoline.
However, for modified LS engines, or those running on E85—a fuel with lower energy content than gasoline—a higher flow rate pump is needed to deliver adequate fuel amounts.
Pick A Pump With Adequate PSI
When selecting a fuel pump for your LS or EFI conversion, it's important to choose one that can provide the right amount of pressure for your system. The pump must meet or exceed the engine's required PSI to ensure efficient fuel delivery.
Standard LS engines generally need a fuel pump capable of delivering around 58 to 60 PSI. However, requirements can be more demanding for engines that are modified or for specific EFI conversions, where fuel pressure needs to align with higher performance expectations.
For example, Gen V LS engines, which feature direct injection, typically demand higher PSI levels to ensure proper fuel atomization, which is crucial for their advanced combustion process.
Beyond choosing a fuel pump with the right PSI, you must also pair it with a compatible fuel pressure regulator, which maintains the pump's pressure to match the engine's requirements. This helps prevent pressure spikes or drops that could affect the efficiency of your LS engine or EFI system.
Inline Fuel Pump Versus An In-Tank Fuel Pump
You'll also have to decide on an LS fuel pump type: inline or in-tank. Your choice can affect not only installation and maintenance but also the overall performance and longevity of your fuel system.
Inline Fuel Pump
Inline fuel pumps are externally mounted along the fuel line outside the fuel tank. They are an excellent choice for ease of access and simplicity in retrofitting applications, particularly for older cars that originally came with carburetors or lower fuel demands.
Pros:
- Installation flexibility, suitable for a variety of vehicle setups
- Easier and often less expensive when it comes to maintenance or replacement
Cons:
- Potential for overheating, as they are not cooled by the surrounding fuel
- Tend to be louder due to their external position
In-Tank Fuel Pump
As the name suggests, in-tank fuel pumps reside inside the fuel tank, using the fuel itself for cooling and sound insulation. This design is standard in modern vehicles, providing a cleaner setup and consistent fuel delivery.
Pros:
- Quieter operation because they are insulated by the fuel tank
- Reduced risk of overheating, which can lead to increased longevity
- Typically, they provide steadier fuel pressure, which is advantageous for EFI systems
Cons:
- Installation often requires dropping the fuel tank, making it more labor-intensive
- Replacement costs can be higher due to the complexity of the work involved
Which Fuel Pump You Should Choose
Aeromotive 340 Stealth Inline Fuel Pump
For LS engine enthusiasts and EFI converters seeking a dependable fuel pump solution, the Aeromotive 340 Stealth in-tank is a top-tier choice.
With a 340 LPH capacity, it's suitable for engines up to around 700 horsepower, meeting the rigorous fueling requirements of high-performing LS engines.
This pump's E85 compatibility and precision fit for most existing hanger assemblies make it a solid pick for drivers prioritizing reliability and quality in their fuel system upgrades.
JEGS Electric 340 In-Tank
The JEGS electric 340 in-tank fuel pump is a high-performance option that integrates smoothly with OE wiring and mounting.
Designed to deliver a significant 340 LPH at 90 PSI, it can support LS engines and EFI conversions for vehicles with power outputs up to around 700 HP.
This fuel pump's compatibility with E85 and inclusion of key installation components—like an inlet filter, wiring pigtail, rubber hose with clamps, and a vibration isolator—make it a fantastic solution for enhancing your vehicle's fuel delivery system and overall performance.
FITech Fuel Injection 255 Inline
For drivers upgrading their LS engines or carrying out EFI conversions, the FITech fuel injection 255 inline fuel pump is an excellent option. This pump's 255 LPH flow rate is ideal for supporting engines up to approximately 500 horsepower, providing a reliable and efficient fuel supply.
The pump features a -8 AN inlet and -6 AN outlet for straightforward integration into existing fuel systems. Plus, its compatibility with ethanol fuels offers flexibility for various applications.
This pump is a solid choice for those looking to maintain or enhance their vehicle's fuel delivery with minimal hassle.
JEGS: For All Your Automotive Needs
If you made it this far, then you now should have all the necessary information to shop for your next fuel pump with confidence.
For a massive selection of quality fuel pump options, consider JEGS, a leading supplier of automotive parts and accessories. Complete your order online and have your products shipped straight to your door.
Still have questions? Contact our team today.
