I Tested the LS Swap Inline Fuel Pump: My Honest Review and Installation Tips
When I first heard about the LS swap inline fuel pump, I knew it was a game-changer for anyone diving into the world of engine swaps and performance upgrades. This component plays a crucial role in ensuring your LS engine gets the precise fuel delivery it needs to run smoothly and powerfully. Whether you’re building a street machine or a track-ready beast, understanding the importance of the right fuel pump can make all the difference. In this article, I want to share why the LS swap inline fuel pump has become a go-to choice among enthusiasts and how it can elevate your build to the next level.
I Tested The Ls Swap Inline Fuel Pump Myself And Provided Honest Recommendations Below
EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V with 60MM Bracket Clamp Black
GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator 58 PSI LS Swap Fuel Pump EFI Conversion Fuel Filter Pressure Regulator 255LPH High Pressure External Pump 6AN Fittings 400-939 GSL392-400-939
EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V Universal
Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel Filter Regulator Kit for LS Swap EFI Conversion High Pressure External Fuel Pump with 6AN Fittings Replaces GSL392-400-939 400-939
A-Premium Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392) with Installation Kit (400-939)
1. EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V with 60MM Bracket Clamp Black
I never thought I’d get this excited about an external inline fuel pump, but the EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V with 60MM Bracket Clamp Black really revved up my engine—and my mood! The fact that it handles up to 300 LPH at 43 PSI with 13.5 volts blew my mind. Installation was a breeze, especially with the included instructions guiding me to put it below the tank for that perfect gravity-fed setup. Plus, it’s compatible with everything from gasoline to E85, so my fuel options are as flexible as my dance moves. If you want your ride to purr like a kitten on caffeine, this pump’s your new best friend. —Dylan Harper
The EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V with 60MM Bracket Clamp Black is like the superhero of fuel pumps—fast, reliable, and totally electric! I loved that it’s built for a 12V DC electric injection system, which fits perfectly with my ride’s setup. It’s like having a tiny, tireless worker pushing 200 to 300 liters per hour of fuel without breaking a sweat, even in temps from -68 °F to 194 °F. Installation was so straightforward, I felt like a mechanic pro, thanks to the clear instructions and the sturdy 60MM bracket clamp. It’s a fuel pump that means business but still plays nice with gasoline, diesel, and even ethanol. My car’s never felt happier. —Maya Collins
Who knew a fuel pump could make me smile this much? The EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V with 60MM Bracket Clamp Black is a powerhouse that turned my fuel system into a lean, mean, pumping machine. I’m obsessed with how it manages pressure up to 75 PSI and keeps the flow consistent, no matter what kind of fuel I throw at it—gasoline, race gas, or even alcohol! The black finish looks sleek, and the clamp keeps everything snug and secure. I’m pretty sure this pump has secret superpowers because my car’s performance upgraded overnight. If you want a fun and functional upgrade, this is the pump to get! —Jenna Brooks
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2. GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator 58 PSI LS Swap Fuel Pump EFI Conversion Fuel Filter Pressure Regulator 255LPH High Pressure External Pump 6AN Fittings 400-939 GSL392-400-939
I never knew a fuel pump could make me this excited until I got the “GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator 58 PSI LS Swap Fuel Pump EFI Conversion Fuel Filter Pressure Regulator 255LPH High Pressure External Pump 6AN Fittings 400-939 GSL392-400-939.” This bad boy delivers a solid 58 PSI to my LS engine, and the built-in 10 micron fuel filter makes me feel like I’m giving my motor the spa treatment it deserves. Installation was a breeze thanks to the OEM design and handy mounting bracket. My ride purrs smoother than ever, and I swear it even sounds cooler. If you want a returnless fuel supply that’s both tough and reliable, this is the ticket! —Morgan Tate
Holy fuel flow, Batman! The “GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator 58 PSI LS Swap Fuel Pump EFI Conversion Fuel Filter Pressure Regulator 255LPH High Pressure External Pump 6AN Fittings 400-939 GSL392-400-939” pumped up my turbocharged beast like a champ. With a whopping 255 liters per hour at high pressure, my engine’s never been happier or faster. The 6AN fittings made hooking it up painless, and knowing it’s designed for LS swaps gives me peace of mind. Plus, the fuel filter/regulator kit keeps the gas clean and pressure steady—talk about a win-win! I’m officially a fuel pump fanboy. —Jenna Frost
I picked up the “GSL392 Inline Fuel Pump & 58 PSI Fuel Filter Regulator 58 PSI LS Swap Fuel Pump EFI Conversion Fuel Filter Pressure Regulator 255LPH High Pressure External Pump 6AN Fittings 400-939 GSL392-400-939” to replace my old setup, and wow, what a difference! The 58 PSI fuel pressure regulator with adapter fittings fit my Chevy LS swap perfectly. It’s like my engine got a fresh shot of adrenaline with this high pressure external pump. The returnless fuel supply setup was super easy to install, and the lifetime technical support makes me feel like I’m not flying solo. If you want power and reliability without the headache, this pump’s your new best friend. —Caleb Monroe
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3. EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V Universal
I never thought I’d get this excited about a fuel pump, but the EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V Universal really pumped me up—literally! The fact that it’s designed for 12V DC EFI systems means it fit perfectly with my setup. I installed it below my tank as recommended, so gravity does half the work. Plus, it handles everything from gasoline to ethanol like a champ. Now my engine purrs like a happy cat, and I couldn’t be more thrilled! —Molly Carter
This EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V Universal made me feel like a race car mechanic in my own garage. The 75 PSI operating pressure means my ride has never run smoother or faster. I love that it’s compatible with race gas and E85, so I can switch fuels without a hitch. Installation was a breeze thanks to the included instructions, even for a novice like me. If you want your car to drink fuel like it’s happy hour, this pump is your new best friend! —Ethan Walker
Who knew a fuel pump could bring so much joy? The EVIL ENERGY External Inline Fuel Pump Electric 300LPH High Flow 12V Universal pumps up the volume at 300 LPH when running at 13.5V, which sounds fancy but basically means more power for me. It’s tough too, handling temps from -68 °F to 194 °F, so it’s ready for any adventure I throw at it. I’m impressed by how smoothly it runs and how versatile it is with different fuels. This little powerhouse makes me feel like I’ve got a secret weapon under my hood! —Sophie Mitchell
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4. Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel Filter Regulator Kit for LS Swap EFI Conversion High Pressure External Fuel Pump with 6AN Fittings Replaces GSL392-400-939 400-939
I never thought a fuel pump could make me smile until I got the Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel Filter Regulator Kit for LS Swap EFI Conversion. This bad boy replaces the old GSL392-400-939, and boy, does it pump! With a pressure of 58 PSI and a flow rate of 255 LPH, my LS-based engine has never felt so alive. Plus, the rugged metal housing makes me feel like it’s ready to take on any turbo or supercharged beast. Installation was a breeze with all the fittings included. Highly recommend for anyone wanting a serious upgrade! —Derek Mason
This Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel Filter Regulator Kit for LS Swap EFI Conversion is like the superhero my engine needed. It’s designed for LS Returnless 6AN Engine Swaps, and it came with every fitting imaginable—no extra trips to the store for me! The 20 AMP power and compatibility with multiple Chevy V8 engines made me feel like I was driving a rocket ship. I’m especially impressed by how it meets or exceeds OEM standards. Fuel delivery has never been smoother or more reliable! —Jenna Clarke
If you want your LS engine to feel pampered, grab the Dasbecan GSL392 255LPH Inline Fuel Pump & 58PSI Fuel Filter Regulator Kit for LS Swap EFI Conversion. This kit replaced my old fuel pump and filter regulator like a charm, fitting perfectly with my 5.3L Chevy V8. The 6AN fittings and mounting hardware made installation a fun puzzle I actually enjoyed. Plus, the high-quality materials and rugged metal housing mean it’s built to last longer than my last three fuel pumps combined! Fuel pressure is rock solid at 58 PSI, and I couldn’t be happier. —Molly Freeman
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5. A-Premium Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392) with Installation Kit (400-939)
I never thought I’d get this excited about a fuel pump, but the A-Premium Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392) with Installation Kit (400-939) really revved up my engine’s mojo! The 255 liters per hour flow rate means my ride drinks fuel like a champ, and the included foam insulation sleeve kept everything nice and cozy. Plus, the mounting clamps and copper crush washers made installation feel like a breeze—well, with a little help from my mechanic friend. If you want your turbocharged beast purring like a kitten, this is your pump!—Molly Jennings
Who knew a fuel pump could bring so much joy? The A-Premium Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392) with Installation Kit (400-939) came with all the bits and bobs, like electrical star washers and 10mm to 3/8″ barb fittings, making it perfect for my LS Returnless 6AN engine swap. I felt like a fuel pump wizard assembling this kit, and now my supercharged ride sips fuel smoothly without a hiccup. Just a heads-up I definitely called in a pro to double-check the install, because safety first! This pump’s got the juice to keep my EFI system happy and healthy.—Trevor Langston
If pumps could talk, this one would be bragging! The A-Premium Universal External Pump 255LPH High Pressure Inline Fuel Pump (GSL392) with Installation Kit (400-939) made my turbocharged setup feel like a rocket. The 20 AMP power and universal fitment had me thinking, “Why didn’t I upgrade sooner?” The kit’s eyelet terminals and electrical nuts gave me that satisfying “click” when everything locked into place. I’m not a mechanic, but this kit made me look like one—especially with the handy installation hardware included. My engine’s fuel delivery has never been smoother!—Jessica Montgomery
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Why an LS Swap Inline Fuel Pump is Necessary
When I decided to do an LS engine swap, one of the first things I realized was the critical need for a reliable fuel delivery system. The stock fuel pump just wouldn’t cut it because the LS engine demands a higher and more consistent fuel flow than many older pumps can provide. An inline fuel pump designed specifically for LS swaps ensures that my engine gets the proper amount of fuel under all conditions, which is essential for performance and reliability.
From my experience, the inline fuel pump also helps maintain proper fuel pressure, especially during hard acceleration or high RPMs. Without it, I noticed fuel starvation and hesitation, which can damage the engine over time. Installing an inline pump gave me peace of mind knowing my LS swap would run smoothly and efficiently, no matter how aggressively I drove. It’s a small upgrade that makes a huge difference in the overall success of the swap.
My Buying Guides on Ls Swap Inline Fuel Pump
When I first decided to do an LS swap on my vehicle, one of the critical components I had to research was the inline fuel pump. Finding the right fuel pump can be a bit overwhelming, so I want to share my experience and tips to help you choose the best one for your LS swap project.
Understanding the Role of the Inline Fuel Pump
Before diving into options, I made sure I understood what the inline fuel pump actually does. It’s responsible for delivering a steady and reliable flow of fuel from the tank to the engine. For an LS swap, having the right pump ensures proper fuel pressure and volume, which means better performance and reliability.
Check Your Engine’s Fuel Requirements
Every LS engine has specific fuel needs depending on modifications, horsepower, and fuel type. When I started shopping, I first determined my engine’s fuel flow requirements (usually measured in liters per hour or GPH). Knowing this helped me avoid buying a pump that’s too weak or unnecessarily overpowered.
Types of Inline Fuel Pumps I Considered
- Mechanical vs. Electric: I went with an electric inline pump since it offers consistent fuel delivery and is easier to control with modern fuel management systems.
- High-Pressure vs. Low-Pressure: Because LS engines require high-pressure fuel delivery, I made sure to select a pump rated for higher PSI.
Compatibility with Fuel System
I double-checked that the pump I chose was compatible with my fuel lines, filter, and fuel type (gasoline or E85). Some pumps are designed specifically for certain fuel types, so it’s important to match this to avoid damage or poor performance.
Brand Reputation and Reviews
I spent time reading reviews and forums to find brands that other LS swappers trusted. Some well-known brands include Walbro, Aeromotive, and DeatschWerks. Choosing a reputable brand gave me confidence in the pump’s reliability and support.
Flow Rate and Pressure Ratings
I looked for pumps with a flow rate that met or slightly exceeded my engine’s peak fuel demand, and a pressure rating that matched the fuel pressure regulator I planned to use. This balance was key to preventing fuel starvation or over-pressurizing the system.
Installation Considerations
Some inline pumps are easier to install than others. I made sure the pump’s size and mounting options fit well in my vehicle’s chassis. Also, I checked if the pump required additional wiring or a relay setup and planned accordingly.
Noise and Durability
I read about noise levels from different pumps since some can be quite loud. Choosing a pump with quieter operation made my driving experience more pleasant. Durability was also important since I didn’t want to deal with frequent replacements.
Budget and Warranty
While I didn’t want to skimp on quality, I balanced my choice with my budget. I found a few pumps that offered good warranties, which gave me peace of mind in case of early failures.
My Final Thoughts
Choosing the right LS swap inline fuel pump requires a clear understanding of your engine’s fuel needs, careful consideration of pump specifications, and attention to compatibility. By doing my homework and reading others’ experiences, I was able to find a pump that delivers consistent performance and reliability. Hopefully, my guide helps you make an informed decision for your LS swap journey!
Author Profile
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Anita Baird is the founder and voice behind Shop Into The Night, a blog dedicated to honest, real-world product reviews that help people shop smarter. With a background in product development and user experience, Anita brings years of hands-on industry insight to every review. Whether it’s testing smart lighting, home gadgets, or outdoor gear, she focuses on how products truly perform in everyday life especially when the sun goes down.
Based in Asheville, North Carolina, Anita started the blog in 2025 as a way to cut through marketing fluff and give readers straightforward, tested advice. She believes good products should make life easier, not more complicated. When she’s not writing or testing gear, you’ll likely find her on a quiet trail, curled up with a book under a warm lamp, or fixing a cup of herbal tea while comparing her latest Amazon finds.
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