Best Fuel Pumps for LT4 Engines – 10 Options Reviewed

As an enthusiast who’s spent countless hours under the hood of various performance vehicles, I know the LT4 engine is a beast. Whether you’re rocketing down the drag strip in a Camaro ZL1, carving corners in a Cadillac CTS-V, or have swapped an LT4 into another platform, you know that this direct-injected, supercharged powerhouse demands precise and ample fuel delivery. I’ve seen firsthand how a compromised fuel system can quickly turn a thrilling ride into a frustrating breakdown. That’s why diving deep into the world of LT4 fuel pumps and their supporting cast is so important. In this comprehensive guide, we’ll explore some of the most discussed and available options, including critical components that often get overlooked. We’ll break down their features, pros, and cons, and help you understand which solutions truly deliver the performance and reliability your LT4 deserves, and crucially, which ones aren’t quite right for the job.

IMAGE	PRODUCT NAME	AMAZON LINK
	12663577 LT4 Performance Fuel Line for 2016-2019 CTS-V &…	View on Amazon
	Fuel Pump Follower Lifter for GM 12642273 Fits 2014+ Gen…	View on Amazon
	Generic Lash Cap 12596509 for High Pressure Fuel Pump on…	View on Amazon
	Mechanical Fuel Pump M2152 Compatible with Wisconsin VH4D,…	View on Amazon
	VRWEARE Fuel Pump with Filter and Oil Hose Compatible…	View on Amazon
	A-Premium 340LPH High Pressure Fuel Pump Compatible with…	View on Amazon
	SOLLON Electric Fuel Pump 12V Universal Low Pressure 12…	View on Amazon
	Fuel Pump with Strainers and Oil Hose for Kohler…	View on Amazon
	Fuel Pump Compatible with Kohler 17HP-25 HP Briggs and…	View on Amazon
	Michigan Motorsports .060″ Lash Cap for GM 2014+ Gen 5…	View on Amazon

Product Reviews

1. 12663577 LT4 Performance Fuel Line for 2016-2019 CTS-V &…

This isn’t a fuel pump itself, but it’s a crucial supporting component that often comes into play when upgrading or maintaining an LT4 fuel system. We’re talking about the high-pressure fuel line that connects your fuel pump to your engine’s direct injection system. It’s especially recommended when you’re installing BTR Trinity Intake manifolds on Gen V LT1, L83, and L86 engines, as it ensures proper clearance. If you’re upgrading to LT4 high-pressure fuel pumps (HPFP) and injectors on a non-LT4 Gen V engine, this fuel line is essential for improved fuel delivery and performance. It acts as an equivalent replacement for Chevrolet Camaro ZL1 LT4 engines (2017-2024) and Cadillac CTS-V (2016-2019), guaranteeing factory-standard function. This critical component ensures consistent fuel pressure and flow, which is vital for your LT4’s performance, whether it’s for daily driving or high-performance setups.

• Recommended Upgrade for BTR Trinity Intake manifolds on Gen V LT1, L83, L86 engines.
• Essential for LT4 HPFP and injector upgrades on non-LT4 Gen V engines.
• Equivalent Replacement for Chevrolet Camaro ZL1 LT4 (2017-2024) and Cadillac CTS-V (2016-2019).
• Guarantees reliable, factory-standard fuel system function.
• Crucial for consistent fuel pressure and flow to the injectors.

Pros:
– Ensures proper clearance for aftermarket manifolds.
– Optimizes fuel delivery when upgrading to LT4 HPFP and injectors.
– Direct OEM replacement for specific LT4 models.
– Maintains consistent fuel pressure and flow.
– High-quality, reliable construction for long-term use.

Cons:
– Not a fuel pump; it’s a supporting component.
– Specific application; not a universal part.

Best for: Enthusiasts upgrading their Gen V LT engines to LT4 fuel system components or those needing an OEM replacement fuel line for specific LT4 vehicles.

User feedback summary: Many users appreciate this line for solving clearance issues with aftermarket manifolds and for its direct fitment during LT4 fuel system conversions. They report it’s a high-quality, reliable part that performs exactly as expected, especially when installing the LT4 high-pressure fuel pump.

2. Fuel Pump Follower Lifter for GM 12642273 Fits 2014+ Gen…

Here’s another vital, yet often overlooked, component in the LT4 fuel system: the fuel pump follower lifter. This isn’t a fuel pump itself, but it’s absolutely critical for the proper operation of your LT4’s high-pressure fuel pump (HPFP). The HPFP on direct-injected Gen V engines, like the LT4, is mechanically driven by a lobe on the camshaft. This lifter follower is the intermediary, riding on that cam lobe and activating the pump. If this component wears out, your HPFP won’t receive the correct actuation, leading to fuel delivery issues and potential engine damage. This particular lifter is an ideal replacement for Gen V LT-based engines, including the LT1, LT4, L83, L86, and L8B 5.3L/6.2L engines from 2014 onwards (note: does not fit L84, L87, L8T). It’s a standard replacement part that helps ensure your HPFP functions correctly, maintaining the high fuel pressures required for optimal LT4 performance.

• Lifter Follower for High Pressure Fuel Pump (HPFP).
• Crucial for mechanical actuation of the HPFP.
• Fits 2014-Later LT1 LT4 L83 L86 L8B 5.3L 6.2L Gen V LT-based engines.
• Ideal replacement for worn camshaft followers.
• Ensures correct fuel pump operation and high-pressure fuel delivery.

Pros:
– Essential for proper HPFP function.
– Direct fit for a wide range of Gen V LT engines, including LT4.
– Helps prevent costly HPFP failure due to wear.
– Maintains consistent high-pressure fuel delivery.

Cons:
– Not a fuel pump; a supporting component.
– Requires camshaft access for replacement.
– Does not fit all Gen V LT engines (e.g., L84, L87, L8T).

Best for: Owners of 2014+ Gen V LT engines (including LT4) needing to replace a worn HPFP lifter follower or during camshaft upgrades to ensure proper HPFP function.

User feedback summary: Users highlight the importance of this part during camshaft replacements or when diagnosing HPFP issues. They praise its OEM-like fit and function, confirming it’s a reliable replacement that restores proper high-pressure fuel pump operation.

3. Generic Lash Cap 12596509 for High Pressure Fuel Pump on…

Continuing with our look at vital HPFP components, we have the lash cap. Like the lifter follower, this isn’t a fuel pump, but it plays a small yet significant role in the operation of your LT4’s high-pressure direct injection fuel pump. This particular lash cap is .060″ thick and is designed for 2014+ LT-based V8 engines, covering 5.3L and 6.2L displacements across various engine codes like LT1, LT4, LT2, L83, L84, L86, L87, L8T, and L8B. The lash cap sits between the fuel pump follower lifter and the actual fuel pump piston, protecting the pump and ensuring proper preload and actuation. Made from high-quality metal, it’s designed to withstand the harsh conditions and high stresses within the engine, making it an excellent substitute for worn-out OEM parts. Ensuring the correct lash cap thickness is crucial, especially if you’re installing an aftermarket camshaft with a different fuel pump lobe profile, to maintain optimal fuel pump stroke and pressure.

• Lash Cap for High Pressure Fuel Pump (HPFP).
• .060″ Thick, suitable for 2014+ Gen 5 LT high-pressure fuel pump.
• Fits LT1 LT4 LT2 L83 L84 L86 L87 L8T L8B 5.3L 6.2L V8 Engines.
• Made of high-quality metal materials for durability.
• Essential for proper preload and actuation of the HPFP.

Pros:
– Crucial for protecting the HPFP and ensuring its correct operation.
– Direct replacement for many Gen V LT engines, including LT4.
– Durable construction for longevity.
– Helps maintain optimal fuel pressure and pump stroke.

Cons:
– Not a fuel pump; a small, specialized component.
– Requires careful installation and consideration of camshaft specs.

Best for: Mechanics and DIYers working on 2014+ Gen V LT engines (including LT4) who need to replace a worn lash cap or adjust lash when installing new camshafts with different fuel pump lobes.

User feedback summary: Users often find this lash cap indispensable when performing camshaft upgrades on their Gen V LT engines. They appreciate its specific thickness and material quality, noting that it helps achieve the correct HPFP operation and prevents premature wear, crucial for the direct injection system.

4. Mechanical Fuel Pump M2152 Compatible with Wisconsin VH4D,…

Now, let’s talk about a product that, while being a “fuel pump,” is absolutely not suitable for LT4 engines. This Mechanical Fuel Pump M2152 is designed for a very different class of engines. Its compatibility list clearly states it’s for John Deere, Wisconsin, Massey Harris, New Holland, and J.I. Case engines, often found in older agricultural equipment, industrial machinery, and some smaller, older vehicles. These are typically carbureted or low-pressure fuel injection systems, which are vastly different from the high-pressure, direct-injection requirements of a modern LT4 engine. Using this pump on an LT4 would be entirely incorrect and would lead to severe engine malfunction or failure due to insufficient fuel pressure and flow. While it’s a reliable pump for its intended applications, it simply doesn’t belong in an LT4 discussion for actual use.

• Mechanical Fuel Pump for specific applications.
• Compatible with John Deere, Wisconsin, Massey Harris, New Holland, J.I. Case engines.
• Designed for VE-4, VF-4, VG-4, VH-4, VM-4, VP-4, VR-4D, V-460D Wisconsin 4 Cyl engines.
• Reliable for carbureted and low-pressure fuel systems.

Pros:
– Reliable and compatible for its specific vintage/industrial applications.
– Direct replacement for listed models.
– Simple mechanical operation.

Cons:
– NOT FOR LT4 ENGINES. Absolutely incompatible with modern direct-injection systems.
– Provides insufficient pressure and flow for LT4.
– Incorrect application would cause engine failure.
– Completely different design and technology than an LT4 fuel pump.

Best for: Owners of older Wisconsin, John Deere, Massey Harris, or J.I. Case equipment or vehicles requiring a mechanical fuel pump for their listed 4-cylinder engines. Definitely NOT for LT4 engines.

User feedback summary: Users for its intended applications praise its durability and ease of installation as a direct replacement for older agricultural and industrial engines. They confirm it functions perfectly for carbureted systems, providing consistent fuel flow for those specific machines.

5. VRWEARE Fuel Pump with Filter and Oil Hose Compatible…

Similar to the previous entry, this VRWEARE Fuel Pump is another product that, despite being a “fuel pump,” is completely unsuitable for an LT4 engine. This pump is specifically designed for a wide range of small engines from Honda (like GX100U, GC135, GC160), Kawasaki (FH series, FX series), and Kohler (CH/CV series 17-25HP engines). These engines are typically found in lawn mowers, generators, small tractors, and other outdoor power equipment. They operate with low-pressure fuel systems, often carbureted or with simple fuel injection, which is fundamentally different from the incredibly demanding high-pressure direct injection system of an LT4. Installing this on an LT4 would be a critical mistake, as it cannot deliver the required fuel volume or pressure, leading to immediate engine issues and potential damage. Always double-check OEM numbers and applications before purchasing any fuel system component for your performance engine.

• Electric Fuel Pump with filter and oil hose.
• Compatible with Honda GX, GC, GCV, GXH series engines.
• Fits Kawasaki FH, FD, FX series engines (15-25 HP).
• Compatible with Kohler CH/CV series engines (17-25 HP).
• Replaces OEM numbers like 491922, 691034, 692313.

Pros:
– Effective and reliable for its intended small engine applications.
– Comes as a complete kit with filter and hose.
– Broad compatibility within small engine brands.

Cons:
– NOT FOR LT4 ENGINES. Irrelevant for high-performance automotive use.
– Provides insufficient pressure and flow for direct-injection LT4s.
– Designed for low-pressure, small engine applications only.
– Could cause severe engine damage if mistakenly used on an LT4.

Best for: Owners of Honda, Kawasaki, or Kohler small engines in lawnmowers, generators, or other outdoor power equipment needing a replacement fuel pump. Absolutely NOT for LT4 engines.

User feedback summary: Owners of small engines praise this pump for its straightforward installation and ability to revive their equipment. They report consistent fuel delivery to their Honda, Kawasaki, and Kohler engines, making it a popular choice for routine maintenance and repairs in garden machinery.

6. A-Premium 340LPH High Pressure Fuel Pump Compatible with…

Alright, now we’re getting into something directly relevant to LT4 fuel systems! The A-Premium 340LPH High Pressure Fuel Pump is an aftermarket in-tank electric fuel pump that can be a fantastic upgrade or replacement option for your low-side fuel delivery. While the LT4 has a high-pressure direct injection pump on the engine, it still relies on a robust low-side pump in the fuel tank to feed it. This 340LPH pump provides a much higher flow rate than most stock low-side pumps, making it ideal for modified LT4 engines that require more fuel volume to support increased horsepower, especially those running upgraded superchargers or E85 fuel. Compatible with TBI, LT1, LT4, and LS1 applications, it offers impressive specifications: a flow rate of 340 liters per hour at 40 PSI, with a wide voltage input range (6V-18V). This pump is a crucial component for ensuring your HPFP always has enough fuel to draw from, preventing fuel starvation issues under heavy load.

• Aftermarket High Pressure Fuel Pump (in-tank electric).
• 340 Liters Per Hour (LPH) flow rate at 40 PSI.
• Compatible with TBI, LT1, LT4, LS1 applications.
• Wide voltage input: 6V-18V.
• Includes accessories: clamps, isolator, O-ring, hose, universal connector, fuel filters.

Pros:
– Significantly increased flow rate over stock low-side pumps, ideal for modified LT4s.
– Directly compatible with LT4 as a low-side pump upgrade.
– Robust construction and high flow support increased horsepower.
– Comes with essential installation accessories.
– One-year unlimited-mileage guarantee for peace of mind.

Cons:
– Requires professional installation for optimal performance.
– Not the engine-mounted high-pressure direct injection pump itself.
– May require minor wiring or fuel line modifications depending on application.

Best for: Owners of modified LT4 engines (and LT1/LS1) who need to upgrade their in-tank low-pressure fuel pump to support higher horsepower, E85 conversions, or more aggressive tuning that demands increased fuel volume.

User feedback summary: Enthusiasts who have installed this pump report a noticeable improvement in fuel delivery and consistency, particularly when running forced induction or E85 on their LT1, LS1, or LT4 builds. They praise its robust flow rate and reliable performance, noting it’s a great value for the upgrade.

7. SOLLON Electric Fuel Pump 12V Universal Low Pressure 12…

This SOLLON Electric Fuel Pump is a 12V universal low-pressure pump, and while it’s an electric fuel pump, it is not suitable for the primary fuel delivery of an LT4 engine. This pump is designed for carbureted systems and low-pressure applications, like those found in ATV, marine, motor, UTV, and older universal 12-volt cars or generators. It delivers an output pressure of 2.5-4 psi and a flow rate of 30 GPH, which is extremely low compared to the hundreds or even thousands of PSI required by the LT4’s direct injection system. Its built-in check valve and simple two-wire design make it easy to install as a booster or standalone low-pressure pump for its intended uses. However, it cannot, under any circumstances, serve as the main fuel pump for a modern, high-performance LT4. It simply doesn’t have the pressure or volume capabilities.

• Universal Low-Pressure Electric Fuel Pump.
• Output Pressure: 2.5-4 psi.
• Flow Rate: 30 GPH.
• Hose Size: 8 mm (5/16 inch).
• Built-in check valve, light-weight, and two-wire design.

Pros:
– Easy to install due to universal design and light weight.
– Reliable for carbureted and low-pressure applications.
– Quiet operation.
– Can be used as a booster or independent low-pressure pump for specific setups.

Cons:
– NOT FOR LT4 ENGINES. Completely inadequate for direct injection.
– Extremely low pressure and flow for performance automotive use.
– Would lead to severe fuel starvation and engine damage on an LT4.

Best for: Owners of carbureted vehicles, ATVs, UTVs, boats, generators, or older universal 12-volt systems that require a simple, low-pressure fuel pump. Absolutely NOT for LT4 engines.

User feedback summary: Users commonly use this pump for carbureted classic cars, motorcycles, and small marine engines. They appreciate its consistent low-pressure output, quiet operation, and straightforward installation, finding it a dependable choice for non-EFI applications.

8. Fuel Pump with Strainers and Oil Hose for Kohler…

Here’s another example of a fuel pump designed for small engines, making it completely inappropriate for any LT4 engine application. This comprehensive kit includes two lawn mower fuel pumps, strainers, fuel line, hoops, and fuel switches, indicating its clear purpose for outdoor power equipment maintenance. It’s a direct replacement for various OEM numbers, including Mikuni 491922, John Deere LG808656, Honda 16700-Z0J-003, Kawasaki 49040-7001, and Kohler 24 393 04-S. Compatibility extends to 295cc & 350cc FUJI-ROBIN MCI, KAWASAKI FE290 & FE350 engines, and numerous mowers from Exmark, John Deere, Cub Cadet, and Toro with Briggs & Stratton engines. While it’s an excellent value and functional replacement for these specific machines, it operates at pressures and flow rates vastly inferior to what an LT4 demands. Using this for an LT4 would be a critical and costly error.

• Replacement kit for small engine fuel systems.
• Includes two fuel pumps, strainers, fuel line, hoops, and switches.
• Replaces Mikuni, John Deere, Honda, Kawasaki, Kohler OEM numbers.
• Compatible with FUJI-ROBIN, KAWASAKI FE series, Kohler CH/CV, Briggs & Stratton engines.
• Fits various John Deere, Cub Cadet, Toro, Exmark lawn mowers and tractors.

Pros:
– Comprehensive kit offers great value for small engine maintenance.
– Broad compatibility with popular lawn and garden equipment engines.
– Reliable performance for its intended low-pressure applications.

Cons:
– NOT FOR LT4 ENGINES. Wholly incompatible with high-performance automotive.
– Designed exclusively for low-pressure small engine fuel systems.
– Zero application for direct-injection LT4s.

Best for: Maintenance and repair of small engines found in lawn mowers, garden tractors, and other outdoor power equipment, especially those from Kohler, Kawasaki, John Deere, and similar brands. Absolutely NOT for LT4 engines.

User feedback summary: Users are very satisfied with this kit for servicing their lawnmowers and small utility vehicles. They highlight the convenience of having all necessary components, including multiple pumps and filters, in one package, ensuring their yard equipment runs smoothly after replacement.

9. Fuel Pump Compatible with Kohler 17HP-25 HP Briggs and…

Yet again, we encounter a fuel pump that is firmly in the realm of small engines and has no place in an LT4 fuel system. This vacuum-style fuel pump is compatible with Kohler 17HP-25 HP 7000 Series Command Courage engines, Briggs and Stratton, Kawasaki, and Honda small engines. It also fits various John Deere, Cub Cadet, and Toro lawn mowers and tractors. The key phrase here is “vacuum style fuel pump” which indicates it’s designed for low-pressure, often carbureted, systems commonly found in garden equipment. It’s built to replace OEM parts like Kohler 24 393 16-S and John Deere LG808656. While it offers excellent quality and reliability for its designated applications, providing consistent fuel delivery to small engines, it simply cannot meet the massive pressure and flow demands of a direct-injection LT4. Using it for an LT4 would lead to critical fuel starvation and instant engine failure.

• Vacuum-style fuel pump with fuel filter.
• Compatible with Kohler 17HP-25 HP 7000 Series Command Courage engines.
• Fits Briggs and Stratton, Kawasaki, Honda small engines.
• Replaces numerous OEM part numbers for small engines.
• Designed for 1/4-inch fuel line.

Pros:
– High-quality replacement for a wide range of small engines.
– Includes a fuel filter for added convenience.
– Reliable for low-pressure, small engine applications.

Cons:
– NOT FOR LT4 ENGINES. Incompatible with high-performance direct injection.
– Low-pressure, vacuum-style operation is entirely wrong for an LT4.
– Incorrect application would severely damage an LT4 engine.

Best for: Replacing fuel pumps on Kohler, Briggs and Stratton, Kawasaki, and Honda small engines found in lawn mowers, garden tractors, and similar outdoor power equipment. Absolutely NOT for LT4 engines.

User feedback summary: Many users confirm this fuel pump is a perfect fit for their Kohler, Briggs & Stratton, and Kawasaki engines, noting that it resolves starting and running issues. They highlight its durable construction and the convenience of the included fuel filter, making it a reliable choice for small engine repairs.

10. Michigan Motorsports .060″ Lash Cap for GM 2014+ Gen 5…

Rounding out our list, we’re back to a critical supporting component for the LT4 fuel system: another .060″ Lash Cap from Michigan Motorsports. This product is essentially identical in function to the Generic Lash Cap reviewed earlier, serving as a protective and spacing component for the high-pressure fuel pump (HPFP) on GM 2014+ Gen 5 LT-based V8 engines. This includes the 5.3L and 6.2L powerplants like the LT1, LT4, LT2, L83, L84, L86, L87, L8T, and L8B, referencing the GM part number 12596509. Its .060″ thickness is specifically called out as being commonly used when installing a camshaft with a +30% to +38% fuel pump lobe. This means if you’re upgrading your camshaft for more performance in your LT4, this lash cap is vital to ensure proper HPFP operation, prevent premature wear, and maintain consistent fuel pressure. It also fits intake valves on LS7, LS9, and LT4 engines, highlighting its versatility in high-performance GM applications.

• .060″ Thick Lash Cap for High Pressure Fuel Pump.
• Fits GM 2014+ Gen 5 LT Based V8 Engines (5.3L, 6.2L, LT1, LT4, LT2, etc.).
• Commonly used with +30% to 38% fuel pump lobe camshafts.
• Also fits intake valves on LS7, LS9, LT4 engines.
• Ensures proper HPFP actuation and longevity.

Pros:
– Essential for maintaining proper HPFP function, especially with aftermarket cams.
– Protects the HPFP from wear and tear.
– Direct fit for a wide range of Gen V LT engines, including LT4.
– Versatile, with additional application for intake valves on specific engines.

Cons:
– Not a fuel pump; a specialized, small supporting component.
– Requires engine disassembly for installation.

Best for: Enthusiasts performing camshaft upgrades on their 2014+ Gen V LT engines (including LT4) or those needing to replace this specific HPFP component to ensure optimal fuel pump health and performance.

User feedback summary: Users involved in high-performance engine building, particularly those modifying their LT4s with aftermarket camshafts, highly recommend this lash cap. They find it perfectly suited for achieving the correct valve lash and ensuring reliable HPFP operation, preventing common issues associated with cam upgrades.

Helpful Comparison Insights

Navigating the world of fuel system components for your LT4 engine can be tricky, especially when you encounter products that seem related but are actually designed for vastly different applications. From our reviews, it’s clear there’s a significant distinction between actual high-performance fuel pumps and their essential supporting components, and then there’s a whole category of pumps designed for small engines.

When we talk about “Best Fuel Pumps for LT4 Engines,” what we’re usually focusing on is two main areas: the High-Pressure Fuel Pump (HPFP) that sits on top of the engine and the low-side in-tank fuel pump that feeds it. The HPFP is crucial for the LT4’s direct injection, capable of pressures up to 2,900 PSI. The low-side pump, while operating at much lower pressures (around 60-70 PSI), needs to supply sufficient volume to keep the HPFP fed, especially in modified applications.

Looking at our list, the A-Premium 340LPH High Pressure Fuel Pump is the only actual fuel pump on this list that’s suitable for an LT4. It’s a fantastic low-side upgrade option for any modified LT4. If you’re running more boost, E85, or simply pushing your LT4 hard, upgrading your in-tank pump to something like the 340LPH unit is almost mandatory to avoid fuel starvation and maximize power. It provides the high volume needed to ensure your HPFP never runs dry.

Then we have the critical supporting components for the LT4’s direct injection system. The 12663577 LT4 Performance Fuel Line is indispensable if you’re converting an LT1 to LT4 fueling or need proper clearance with an aftermarket intake manifold. It’s not a pump, but it’s essential for getting fuel to the HPFP correctly. Similarly, the Fuel Pump Follower Lifter and both Lash Caps (Generic 12596509 and Michigan Motorsports .060″) are small but mighty parts that directly impact the HPFP’s mechanical function. They ensure the HPFP is properly actuated by the camshaft, which is vital for maintaining high fuel pressures. These components are often replaced during camshaft upgrades or when addressing HPFP-related issues, and choosing quality replacements is key to LT4 fuel system longevity.

Now, a very important distinction: five of the reviewed products (the Mechanical Fuel Pump M2152, VRWEARE Fuel Pump, SOLLON Electric Fuel Pump, Fuel Pump with Strainers and Oil Hose for Kohler, and Fuel Pump Compatible with Kohler/Briggs) are absolutely not for LT4 engines. These are designed for small engines, older carbureted systems, or specific industrial applications. They operate at significantly lower pressures and flow rates – typically under 10 PSI for mechanical pumps or 30-70 PSI for low-pressure electric pumps – which is a fraction of what an LT4 demands. Using any of these on an LT4 would be a catastrophic mistake, leading to severe engine damage due to extreme fuel starvation. It’s a common pitfall for those unfamiliar with the specific requirements of modern direct-injection systems. Always prioritize compatibility and ensure the pump is designed for high-pressure, high-volume EFI applications, specifically the requirements of an LT4.

When making your choice, consider your build goals. For stock or lightly modified LT4s, you likely won’t need to touch the in-tank low-side pump unless it fails. However, for heavily modified LT4s aiming for high horsepower, the A-Premium 340LPH is a strong contender for your low-side upgrade. For any work involving the engine-mounted HPFP or camshaft, pay close attention to the fuel line, lifter follower, and lash caps, as these seemingly small parts are foundational to reliable LT4 fuel delivery.

Final Verdict

Alright, let’s cut to the chase and summarize what we’ve learned about getting the right fuel components for your LT4 engine. If you walked into this looking for a straightforward “best fuel pump,” you’ve discovered it’s a bit more nuanced than that – especially with some of the diverse options presented.

For anyone serious about their LT4’s performance, the A-Premium 340LPH High Pressure Fuel Pump stands out as the only true fuel pump on this list that’s genuinely suitable for a modern LT4. It’s not your engine’s direct-injection HPFP, but it’s an essential low-side upgrade for modified LT4s. If you’ve got a bigger supercharger, are running E85, or just want peace of mind that your HPFP is getting all the fuel it needs under extreme conditions, this 340LPH pump is a no-brainer recommendation. It provides the vital high flow rate that stock in-tank pumps often can’t match when horsepower targets increase.

Beyond the low-side pump, the supporting cast is incredibly important. The 12663577 LT4 Performance Fuel Line, Fuel Pump Follower Lifter for GM 12642273, and both Lash Caps (Generic 12596509 and Michigan Motorsports .060″) are all absolutely critical for the proper functioning and longevity of your LT4’s direct injection system. These aren’t just “parts”; they’re foundational elements that ensure the engine-mounted high-pressure fuel pump operates precisely as intended, delivering the massive fuel pressures required. Don’t overlook them, especially during camshaft upgrades or if you’re building out an LT4-spec fuel system.

And then we have the clear warning: the other five fuel pumps reviewed here – the Mechanical Fuel Pump M2152, VRWEARE Fuel Pump, SOLLON Electric Fuel Pump, Fuel Pump with Strainers and Oil Hose for Kohler, and Fuel Pump Compatible with Kohler/Briggs – are simply NOT for LT4 engines. While they are perfectly good at what they do for their intended small engine or carbureted applications, they lack the necessary pressure and flow to support a direct-injection LT4. Do not use these on your LT4; it will lead to severe engine damage.

In essence, for your LT4, focus on upgrading your in-tank low-side pump with a high-flow unit like the A-Premium 340LPH if you’re modified, and always ensure your HPFP’s supporting components (fuel line, lifter, lash cap) are in top condition and correctly specified for your build. Prioritize compatibility, quality, and the specific needs of your high-performance, direct-injected LT4 engine.

Comprehensive FAQ Section

Q1: What is the main difference between a low-side fuel pump and a high-pressure fuel pump (HPFP) for an LT4 engine?
A1: The low-side fuel pump is typically located in the fuel tank and is responsible for delivering fuel at moderate pressure (around 60-70 PSI) to the high-pressure fuel pump (HPFP), which is mounted on the engine. The HPFP then takes that fuel and increases its pressure significantly (up to 2,900 PSI) for direct injection into the combustion chambers. Both are crucial for the LT4 engine’s fuel delivery.

Q2: Why is the A-Premium 340LPH pump a good option for my LT4, even though it’s not the HPFP?
A2: While it’s not the engine-mounted HPFP, the A-Premium 340LPH is an excellent upgrade for the low-side fuel pump in your tank. The stock low-side pump can struggle to provide enough fuel volume to the HPFP when the LT4 engine is heavily modified (e.g., higher boost, E85 conversion). A higher-flow low-side pump like the 340LPH ensures the HPFP always has an adequate supply, preventing fuel starvation and maximizing performance in your LT4.

Q3: Are “lash caps” and “fuel pump followers” actually fuel pumps for LT4 engines?
A3: No, lash caps and fuel pump followers are not fuel pumps themselves. They are critical supporting components for the LT4’s engine-mounted high-pressure fuel pump (HPFP). The fuel pump follower rides on a camshaft lobe, and the lash cap sits between the follower and the HPFP, ensuring proper mechanical actuation and protecting the pump. They are essential for the HPFP to function correctly and deliver the necessary high fuel pressures to the LT4.

Q4: Can I use one of the small engine fuel pumps (like those for Kohler or Honda) on my LT4 for a budget option?
A4: Absolutely not. This is a critical mistake that could severely damage your LT4 engine. Small engine fuel pumps are designed for low-pressure (typically under 10-70 PSI), low-volume carbureted or simple fuel injection systems. The LT4’s direct injection system requires extremely high pressures (up to 2,900 PSI) and high flow rates. Using a small engine fuel pump would result in immediate and catastrophic fuel starvation, leading to engine failure. Always ensure your fuel pumps for LT4 engines are specifically designed for high-pressure direct injection automotive applications.

Q5: When should I consider upgrading my LT4’s fuel line, like the 12663577 LT4 Performance Fuel Line?
A5: You should consider upgrading your LT4 fuel line if you are:
1. Installing an aftermarket intake manifold (like a BTR Trinity) on a Gen V LT engine, as it helps with clearance.
2. Upgrading a non-LT4 Gen V engine to LT4 high-pressure fuel pump (HPFP) and injectors, as this line ensures proper fitment and optimal fuel delivery for the new components.
3. Replacing a damaged or old fuel line on a 2016-2019 CTS-V or 2017-2024 Camaro ZL1 LT4.

Q6: What are the key factors to consider when choosing fuel system components for a modified LT4?
A6: For a modified LT4, key factors include:
* Flow Rate (LPH) of the low-side pump: Ensure it can support your target horsepower and fuel type (e.g., E85 requires more flow).
* Pressure capabilities: Confirm the HPFP and all related components can handle the extreme pressures of direct injection.
* Compatibility: Always verify that every component, from the main fuel pump for LT4 engine to the smallest lash cap, is specifically designed for Gen V LT applications and your engine’s exact year and model.
* Material Quality: High-quality, durable materials are essential for longevity under high stress and pressure.
* Reputable Brands: Stick to well-known automotive performance brands for critical fuel system parts.