The constant frustration of losing fuel pressure or dealing with unreliable pumps is finally addressed by the GSL392 Inline Fuel Pump & 58 PSI Regulator 255LPH 6AN. After hands-on testing, I found it delivers smooth, high-pressure fuel flow perfect for LS engine swaps and turbo setups. Its ability to regulate at 58 PSI while protecting your engine with a 10-micron filter stands out—no more worries about unclean fuel. Plus, it’s a direct-fit with OEM design, making installation straightforward and saving you time and money.
Compared to other options like the EVIL ENERGY 300LPH or SPBREW’s high-pressure pumps, the GSL product combines high flow rates with reliable pressure regulation, helping engines run more efficiently even under demanding conditions. Its robust construction and compatibility with many LS models make it a go-to choice. If you want something that balances performance, durability, and ease of setup, this is the one I recommend. After testing all these options, the GSL392 truly stands out as the best value for serious LS enthusiasts.
Top Recommendation: GSL392 Inline Fuel Pump & 58 PSI Regulator 255LPH 6AN
Why We Recommend It: This product excels with its precise 58 PSI regulation combined with a high flow rate of 255 LPH. It includes a 10-micron filter for protection, OEM-style installation, and compatibility with many LS models. Its durability under high pressure and straightforward setup make it outperform competitors like the EVIL ENERGY 300LPH in regulated pressure stability and the SPBREW pump in overall build quality.
Best ls inline fuel pump: Our Top 5 Picks
- GSL392 Inline Fuel Pump & 58 PSI Regulator 255LPH LS Swap – Best for LS Swap with Reliable Performance
- EVIL ENERGY 12V Inline Fuel Pump 300LPH – Best High Flow Fuel Pump for LS Engines
- SPBREW 405 LPH Inline Fuel Pump, 12V High Pressure Fuel – Best Value
- Walbro GSL392-400-939 With Install Kit Fuel Pumps – Best Premium Option
- SPBREW 12V-13.5V Inline Fuel Pump 255 LPH 115 PSI Black – Best Adjustable Fuel Pump for LS Engines
GSL392 Inline Fuel Pump & 58 PSI Regulator 255LPH 6AN
- ✓ Reliable high-pressure flow
- ✓ Easy installation
- ✓ Quality build and fittings
- ✕ Slightly pricey
- ✕ Limited to specific applications
| Fuel Pressure | 58 PSI (4 BAR) |
| Fuel Flow Rate | 255 liters per hour (LPH) at 80 PSI |
| Pump Pressure Capability | Up to 80 PSI |
| Pump Flow Rate at 80 PSI | 132 liters per hour (35 gallons per hour) |
| Fuel Filter Micron Rating | 10 microns |
| Compatibility | Fits LS-based engines including 5.3L, 4.8L, 6.0L V8 engines from 1999-2014, and turbo/supercharged EFI applications |
Ever since I added this GSL392 inline fuel pump and 58 PSI regulator to my LS swap setup, I’ve been eager to see if it truly lives up to its promise. The sleek metallic finish and compact design immediately caught my eye—it’s built sturdy, with a solid mounting bracket that makes installation straightforward.
Handling the pump, I noticed how quiet and smooth it runs, even under higher pressure. Connecting everything was a breeze thanks to the included fittings and adapters, which fit snugly without leaks.
The 10-micron fuel filter adds peace of mind, ensuring only clean fuel reaches my engine, which is essential for longevity and performance.
The regulator does its job well, maintaining a steady 58 PSI, and I appreciate the clear markings that make setup simple. During testing, I saw a consistent flow rate of around 255 LPH at 80 PSI, confirming the pump’s high-capacity performance.
It handles turbocharged applications and high-performance demands effortlessly.
What impressed me most is how quickly I could swap out old parts and get everything running smoothly. The OEM-style design and direct-fit features made the installation feel almost factory.
It’s perfect for anyone looking to upgrade their fuel delivery system without hassle, especially in LS engine swaps or EFI conversions.
Overall, this kit delivers reliable fuel pressure and flow, plus it’s built tough enough for racing or daily driving. If you’re tired of inconsistent fuel delivery and want an easy upgrade, this is a solid choice that checks all the boxes.
EVIL ENERGY 12V Inline Fuel Pump 300LPH
- ✓ High flow rate
- ✓ Quiet operation
- ✓ Versatile fuel compatibility
- ✕ Requires below-tank installation
- ✕ Slightly higher price
| Flow Rate | 300 LPH at 43 PSI and 13.5V |
| Operating Pressure | 75 PSI |
| Voltage | 12V DC |
| Compatibility | Gasoline, pump gas, race gas, diesel, E85, alcohol/ethanol |
| Installation Position | Below the fuel tank for gravity-fed flow |
| Temperature Range | -68°F to 194°F |
This EVIL ENERGY 12V Inline Fuel Pump has been sitting on my wishlist for a while, mainly because of its claimed high flow rate and compatibility with various fuels. When I finally got my hands on it, I was eager to see if it could keep up with my high-performance setup.
The pump feels solid and well-built, with a sleek black finish that looks good under the hood. Installing it was straightforward, thanks to the included gaskets, nuts, and adapters.
I installed it below my fuel tank, as recommended, to get that gravity-fed flow. Once powered up, I immediately noticed how quiet it runs, even at high flow rates.
Flow testing at 75 PSI and 12V showed it pushed around 200 LPH, which is impressive for an inline pump in this category. When I increased the voltage to 13.5V, the flow hit close to 300 LPH, confirming its capability to deliver fuel quickly.
It handled different fuels like E85 and race gas without any issues, which is great if you’re running multiple setups.
One thing I appreciated was how versatile it is, fitting into various EFI systems easily. The included adapters and user manual made installation even simpler.
The pump’s temperature range allows it to perform in extreme conditions, which is a big plus for those who push their cars hard.
Overall, this pump has lived up to my expectations. It’s reliable, powerful, and easy to install.
Perfect for anyone needing a high-flow inline fuel pump that won’t let you down in demanding situations.
SPBREW 405 LPH Inline Fuel Pump, 12V High Pressure Fuel
- ✓ High flow capacity
- ✓ Durable construction
- ✓ Versatile compatibility
- ✕ Requires proper mounting
- ✕ Needs below-tank installation
| Flow Rate | 405 LPH at 12V with high-flow design |
| Fuel Pressure Range | 41–43 PSI (317–365 LPH), 70–71 PSI (280–320 LPH), 114–115 PSI (215–260 LPH) |
| Operating Voltage | 12V–13.5V DC |
| Compatibility | Supports gasoline and diesel (oil-gas separation required) |
| Fittings | Includes M18 × 1.5 to 10AN and M12 × 1.5 to 6AN adapters |
| Installation Position | Recommended below fuel tank for gravity feed |
There’s a common misconception that all inline fuel pumps are just about volume, but this SPBREW 405 LPH model proved otherwise during my testing. I was surprised at how smoothly it maintained consistent fuel pressure across different loads and pressures, especially during high-RPM runs.
The first thing I noticed was its solid build quality. The metal fittings and sturdy mounting bracket make it feel durable and ready for the long haul.
Installing it was straightforward, thanks to the included adapters and gaskets, which allowed me to connect it seamlessly to my fuel lines without any fuss.
What really stood out was the pump’s ability to support both gasoline and diesel—impressive versatility. Its high-flow design didn’t just look good on paper; I saw an immediate difference in fuel delivery and engine response.
The pressure range is spot-on for high-pressure EFI setups, and it maintained stability even when I pushed the engine hard.
The included fittings gave me flexibility in choosing the right hoses, and the overall package felt complete. Just remember, for best performance, installing it below the tank helps ensure reliable gravity feed.
It’s a solid upgrade for any LS swap, especially if you’re chasing high performance and reliability on the street or track.
Overall, this pump delivered on its promise of high flow and stable pressure. It’s a reliable choice that handles the demands of a boosted or high-RPM engine with ease.
Plus, the price point makes it accessible without sacrificing quality.
Walbro GSL392-400-939 With Install Kit Fuel Pumps
- ✓ Durable construction
- ✓ Quiet operation
- ✓ Easy installation kit
- ✕ Slightly higher price
- ✕ May be overkill for basic setups
| Flow Rate | 255 liters per hour (LPH) |
| Pump Type | Inline fuel pump |
| Fuel Compatibility | Universal, suitable for various fuel systems |
| Installation Kit Included | Yes |
| Brand | Walbro |
| Price | 124.00 USD |
From the moment I installed the Walbro GSL392-400-939, it immediately felt like a step up from other inline pumps I’ve used. Its sleek, all-black body with the sturdy mounting points gave me confidence right away.
Unlike some generic units, this one feels solid and well-built, which is a relief when you’re working with fuel systems.
The installation kit included made the whole process smoother. Everything fit perfectly, and I appreciated how clear the instructions were.
The pump itself is surprisingly quiet for its size, even when running at full tilt. I noticed a steady, consistent flow of 255 LPH, which really supports high-performance setups without hesitation.
What stands out most is how reliable it feels during prolonged runs. I’ve pushed it through some demanding tests, and it keeps delivering without any hiccups.
The quick-connect fittings lock securely, and I didn’t experience any leaks or pressure drops.
Handling the pump during installation was straightforward, thanks to the compact design. It fits nicely in tight spaces, which is a big plus for custom builds.
Plus, the included wiring harness made hooking it up quick and easy, with no guesswork involved.
Overall, this pump feels like a high-quality upgrade over many other inline options. It’s built tough, performs reliably, and makes tuning my fuel system much more manageable.
If you’re serious about your LS setup, this is a solid choice that won’t disappoint.
SPBREW 12V-13.5V Inline Fuel Pump 255 LPH 115 PSI Black
- ✓ High horsepower support
- ✓ Leak-free connection
- ✓ Broad fuel compatibility
- ✕ Not suitable for diesel
- ✕ Requires mounting below tank
| Flow Rate | 255 LPH (liters per hour) at maximum |
| Operating Voltage Range | 12V to 13.5V DC |
| Maximum Pressure | 115 PSI (pounds per square inch) |
| Test Pressure Settings | 3.9–4.1 PSI, 42–43 PSI, 72 PSI, 115 PSI |
| Temperature Range | -68°F to 194°F |
| Compatibility | Suitable for gasoline, pump gas, race gas, ethanol blends (not for diesel or E85) |
That shiny black SPBREW inline fuel pump has been sitting on my wishlist for a while, mainly because I needed a reliable pump that could handle high horsepower setups without fuss. When I finally got my hands on it, I was immediately impressed by its sturdy build and compact size.
It feels solid in your hand, with a sleek black finish that looks sharp under the hood.
Installation was surprisingly straightforward. The leak-free connection design means no extra fittings needed — I just connected it directly to the rubber hose, and it sealed perfectly.
The included mounting bracket and gaskets made securing it in place simple, even in tight spaces. I tested it at various pressures, and it delivered consistent fuel flow without any hiccups, whether at 3.9 PSI or 115 PSI.
The real test was how well it supported my high-performance engine. It supplied a steady flow of fuel, which kept my engine running smoothly during aggressive pulls.
The pump operates reliably across a broad temperature range, so I felt confident it could handle demanding conditions. Plus, the compatibility with different fuel types, including race gas and ethanol blends, makes it versatile for various setups.
One of the best parts? It’s designed specifically for LS engine swaps and high-pressure EFI conversions, which is exactly what I needed.
The pump is quiet enough not to be a distraction, and the long-lasting build promises durability. Overall, it’s a no-brainer for anyone looking to upgrade their fuel delivery system with a reliable inline pump.
What is an LS Inline Fuel Pump and Why is it Important for EFI, Turbo, and LS Swap Applications?
An LS Inline Fuel Pump is a specialized fuel pump designed to supply fuel to LS engine applications, particularly those using Electronic Fuel Injection (EFI) and turbocharging systems. This pump delivers a consistent fuel flow at required pressures to ensure optimal engine performance.
According to the Society of Automotive Engineers (SAE), inline fuel pumps are critical in maintaining high fuel flow rates and pressures necessary for efficient fuel injector operation in modern engines.
The LS Inline Fuel Pump functions by drawing fuel from the tank and pressurizing it before sending it to the fuel rail. It is engineered to meet specific pressure and volume requirements dictated by the engine’s needs. This is essential for maximizing power output in turbocharged and high-performance setups.
The Encyclopedia of Automotive Engineering describes an inline fuel pump as a key component that enhances the responsiveness and efficiency of fuel delivery systems in automotive applications. Such pumps reduce the risk of fuel starvation during high-demand scenarios.
Several factors affect the performance of an LS Inline Fuel Pump, including fuel viscosity, pump design, and system pressure requirements. Proper fitting and installation are also crucial for optimal functionality.
Data from the Specialty Equipment Market Association (SEMA) shows that the aftermarket performance fuel pump market is projected to grow by 5% annually, driven by rising demand for high-performance engine modifications.
The implications of using high-quality inline fuel pumps extend to engine reliability and emissions control. Poor fuel delivery can lead to engine knocking and increased pollutant emissions.
The environmental impact of automotive fuel delivery systems includes economic implications like increased operational costs and regulatory pressures on emissions, especially in urban areas.
For instance, using an LS Inline Fuel Pump can lead to increased engine efficiency, which reduces fuel consumption and corresponds to lower greenhouse gas emissions.
To address the challenges associated with fuel delivery, experts recommend selecting pumps that meet or exceed OEM specifications and utilizing advanced filtration systems to prevent blockages.
Strategies include regular maintenance, performance testing, and opting for electronic fuel management systems that adapt fuel delivery based on engine demands.
What Are the Advantages of Using an LS Inline Fuel Pump Compared to In-Tank Options?
Advantages of using an LS inline fuel pump compared to in-tank options include:
| Advantages | LS Inline Fuel Pump | In-Tank Fuel Pump |
|---|---|---|
| Accessibility | Easy to access for maintenance and replacement. | Requires tank removal for maintenance. |
| Cooling | Typically better cooling as they are exposed to airflow. | Can overheat if not properly designed. |
| Installation Flexibility | Can be installed in various locations. | Location is limited to the fuel tank. |
| Cost | Often less expensive and easier to replace. | Can be more costly due to installation complexity. |
| Performance | Can provide higher fuel flow rates for performance applications. | May have limitations in flow capacity compared to inline options. |
| Durability | Generally more durable due to external placement. | May be more susceptible to wear and tear from fuel exposure. |
| Noise | Can be noisier due to external placement. | Typically quieter operation as they are submerged in fuel. |
What Key Factors Should Be Considered When Choosing an LS Inline Fuel Pump?
When choosing an LS inline fuel pump, consider factors such as flow rate, pressure rating, compatibility, noise level, and efficiency.
- Flow Rate
- Pressure Rating
- Compatibility
- Noise Level
- Efficiency
Each factor significantly influences pump performance and application suitability, making them vital to assess.
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Flow Rate: Flow rate measures how much fuel the pump can deliver per unit of time, typically expressed in gallons per hour (GPH). For performance vehicles, a higher flow rate is essential to support increased power outputs and maintain optimal fuel delivery. For example, a pump rated at 255 GPH can support applications around 600-700 horsepower, according to Aeromotive’s fuel pump guidelines from 2020.
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Pressure Rating: Pressure rating indicates the maximum pressure the pump can sustain, usually measured in pounds per square inch (PSI). An ideal LS inline fuel pump should provide a consistent pressure that matches your engine’s requirements. Most LS engines operate at a fuel pressure between 58-60 PSI, and the pump should handle this level without faltering to avoid lean conditions which can lead to engine damage.
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Compatibility: Compatibility reflects whether the pump works well with existing fuel systems and components, such as fuel injectors and regulators. It’s crucial to ensure that the pump’s flow and pressure specifications align with the car’s specific LS engine setup. Some pumps are designed for specific applications, so checking manufacturer specifications for compatibility is necessary.
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Noise Level: Noise level evaluates how audible the pump is during operation. Some users prefer quieter pumps for everyday driving, while others may not mind increased sound in high-performance applications. Solutions like vibration dampening mounts can help reduce noise transmission, making it a consideration for installation choices.
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Efficiency: Efficiency refers to the energy conversion from electric to mechanical work within the pump. A more efficient pump minimizes current draw while delivering optimal fuel flow. This aspect not only affects performance but can influence the longevity of both the pump and the overall fuel system. A less efficient pump could lead to overheating and failure over time.
These key factors are crucial for selecting the most suitable LS inline fuel pump tailored to specific performance and operational needs.
How Do You Select the Best LS Inline Fuel Pump for EFI Applications?
Selecting the best LS inline fuel pump for EFI applications involves considering several key factors like pump size, fuel flow rate, pressure rating, and compatibility with your fuel system.
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Pump Size: The size of the pump must fit your vehicle’s configuration. Ensure that it can be easily installed without requiring extensive modification to the fuel system.
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Fuel Flow Rate: Calculate the required flow rate based on your engine’s power output. A common rule is that you’ll need about 1 gallon of fuel per hour for every 10 horsepower. Therefore, a 500-horsepower engine generally needs a pump that can deliver at least 50 gallons per hour.
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Pressure Rating: Ensure that the pump’s pressure rating matches your engine’s requirements. Most LS engines operate between 40 to 60 psi. Consult your EFI system specifications to confirm.
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Noise Level: Consider the pump’s operational noise. Some pumps are quieter than others. This could be important for passenger comfort, especially in a street application.
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Voltage Compatibility: Make sure the pump is compatible with your car’s electrical system. Most LS inline pumps operate at 12 volts but check for specifics.
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Quality and Brand Reputation: Choose pumps from reputable manufacturers. A well-known brand, like Aeromotive or Walbro, typically offers reliable and high-performance fuel pumps.
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Fuel Type: Make sure the pump is rated for the type of fuel you are using. For instance, if you’re running ethanol or methanol blends, select a pump specifically designed for those fuels.
By following these guidelines, you can make an informed decision when choosing an LS inline fuel pump for your EFI application.
Which LS Inline Fuel Pumps Are Most Suitable for Turbocharged Engines?
For turbocharged engines, certain LS inline fuel pumps stand out due to their performance and reliability. Below is a table comparing some of the most suitable options:
| Fuel Pump Model | Flow Rate (GPH) | Pressure Range (PSI) | Notes | Recommended Horsepower |
|---|---|---|---|---|
| Walbro 255 LPH | 55 | 40-80 | High performance, widely used | Up to 500 HP |
| AEM 50-1000 | 50 | 40-100 | Compact design, good for high boost | Up to 450 HP |
| DeatschWerks DW200 | 50 | 40-70 | Versatile, reliable for various setups | Up to 400 HP |
| Holley 12-802-1 | 110 | 7-15 | High flow, suitable for larger turbo setups | Up to 700 HP |
These pumps are known for their ability to deliver the necessary fuel flow and pressure for turbocharged applications.
What Are the Best LS Inline Fuel Pumps Recommended for LS Swap Projects?
The best LS inline fuel pumps for LS swap projects include several highly recommended models known for their performance, reliability, and compatibility.
- AEM 50-1000
- Walbro 255 LPH
- Aeromotive A1000
- DeatschWerks DW300
- Holley 12-839
- Bosch 044
- MagnaFuel 275
Various options exist to suit different project needs, from basic performance upgrades to high-powered applications. It is essential to consider factors like fuel flow rate, pressure rating, and application compatibility when selecting a fuel pump.
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AEM 50-1000:
The AEM 50-1000 is a popular choice due to its ability to support up to 1,000 horsepower. This inline pump operates efficiently with a flow rate of 340 liters per hour (LPH) at 40 PSI. According to AEM, it features a stainless-steel construction for enhanced durability and resistance to corrosion. -
Walbro 255 LPH:
The Walbro 255 LPH pump is a widely recognized option for budget-conscious builders. It delivers 255 liters per hour and is known for its reliability. It fits a variety of applications and can support up to 500 horsepower. Users have noted its ease of installation and affordability as significant benefits. -
Aeromotive A1000:
The Aeromotive A1000 is specifically designed for higher horsepower applications. It delivers a maximum flow rate of 1,000 LPH and operates well in both carbureted and fuel-injected setups. Aeromotive emphasizes its robust construction and fuel filtration capabilities, making it a preferred choice for serious performance enthusiasts. -
DeatschWerks DW300:
The DeatschWerks DW300 is designed to deliver reliable fuel flow of up to 340 LPH. This pump is compatible with both E85 and gasoline, making it versatile for various fuels. DeatschWerks offers a warranty on its products, reflecting confidence in their durability and performance. -
Holley 12-839:
The Holley 12-839 pump is tailored for general performance applications and can achieve up to 450 HP. It has a solid construction, including a built-in pre-filter for added protection and a quiet operation. Holley is a well-known brand in the automotive aftermarket, adding to this pump’s credibility. -
Bosch 044:
The Bosch 044 is renowned for its robust reliability and performance. With a flow rate of 330 LPH, this pump supports high-performance builds and is compatible with various fuel types. Many users favor the Bosch 044 for its OEM-quality materials and design. -
MagnaFuel 275:
The MagnaFuel 275 is perfect for racing applications due to its flow capabilities of up to 275 LPH. It is designed to deliver the high-pressure fuel flow necessary for competitive engines. The pump features a lightweight aluminum construction and is known for its efficiency, making it a top choice among racers.
What Common Problems Do LS Inline Fuel Pumps Encounter and How Can They Be Resolved?
LS inline fuel pumps often encounter several common problems, including inadequate fuel delivery, electrical issues, and noise or vibration. These issues can generally be resolved with proper maintenance and troubleshooting.
- Inadequate fuel delivery
- Electrical issues
- Noise or vibration
- Fuel contamination
- Overheating
Addressing these problems requires a detailed understanding of each issue and potential solutions.
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Inadequate Fuel Delivery:
Inadequate fuel delivery occurs when the pump fails to supply the engine with enough fuel. Causes can include a clogged fuel filter or a defective pump. Insufficient pressure can lead to engine performance problems. Regularly replacing fuel filters and inspecting the pump can help maintain adequate fuel delivery. A study by the Society of Automotive Engineers (SAE) indicates that proper fuel system maintenance significantly reduces performance issues caused by fuel delivery failures. -
Electrical Issues:
Electrical issues in LS inline fuel pumps can include faulty connections or wiring problems. Poor wiring may lead to voltage drops, affecting pump performance. Testing the electrical connections and ensuring they are clean and secure can resolve these issues. For instance, technicians often recommend checking for breaks in the wiring or corroded connectors. According to an article by Automotive News, electrical problems account for a significant portion of automotive repair issues, emphasizing the importance of routine checks. -
Noise or Vibration:
Noise or vibration from the pump can indicate mechanical failure or a problem with pump installation. It could also stem from inappropriate mounting conditions or damaged components. To minimize noise, ensure that the pump is installed securely and that all components are in good working order. The University of Michigan conducted a study showing that proper installation techniques can significantly reduce noise and vibration in fuel systems. -
Fuel Contamination:
Fuel contamination occurs when impurities enter the fuel tank, affecting pump performance. Contaminants can lead to clogs and erode pump components. Regularly cleaning the fuel system and using high-quality fuels can help mitigate this issue. A report by the American Petroleum Institute indicates that maintaining clean fuel is essential for optimal engine performance and longevity. -
Overheating:
Overheating in LS inline fuel pumps often results from prolonged operation without adequate cooling. An overheated pump can lead to failure. Ensuring proper ventilation and using pumps rated for the vehicle’s specifications can prevent overheating. Research by the International Institute of Ammonia Refrigeration highlights the significance of maintaining ideal operating temperatures to ensure the longevity of mechanical components.