7 Best Electric Water Pumps for LS Engines (Researched and Compared)

Upgrading to an electric water pump on an LS engine can free up horsepower, improve cooling control, and reduce parasitic drag. We researched and compared the top models based on manufacturer specifications, published flow and pressure data, and aggregated owner feedback from forums and Amazon reviews. Our evaluation focuses on real-world performance, durability, and ease of installation to help you choose the right pump for your LS swap, track car, or daily driver.

1. Meziere WP136S: Best Overall

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The Meziere WP136S is a benchmark in the LS electric water pump market. Based on our research of spec sheets and owner feedback, this pump delivers a consistent 35 GPM flow, which is sufficient for most street and track LS engines up to 800+ horsepower. The sealed ball bearing motor and cast aluminum housing are built to withstand high heat and continuous duty. Owners consistently report trouble-free operation over many seasons, making it a top choice for serious builds.

However, the WP136S comes at a premium price. It may be overkill for a stock LS daily driver where a less expensive pump would suffice. Additionally, installation requires a dedicated relay and proper gauge wiring; skipping that can lead to underperformance or failure. If budget is a primary concern, consider our value pick instead.

• Proven reliability on high-horsepower LS builds and road race cars.
• Consistent 35 GPM flow rate ensures excellent cooling even under sustained load.
• Sealed motor and stainless steel shaft resist corrosion and leakage.

Pros: Exceptional build quality and track record.; Easy to install with included gasket and hardware.
Cons: Higher initial investment compared to budget pumps.; Requires proper wiring and relay for reliable operation.

2. CSR Electric Water Pump: Best Value

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The CSR Electric Water Pump offers a compelling mix of performance and affordability. Our evaluation of owner feedback and specifications shows it flows 30 GPM, which is adequate for LS engines up to around 600 horsepower. The brushless motor is a modern upgrade that improves efficiency and reduces the risk of brush wear. Many LS swappers on a budget have found this pump to be a reliable solution.

That said, durability is slightly behind the Meziere. A small number of owners reported seal weeping after a year or two of use, though CSR’s customer service is responsive. This pump is best for street and occasional track use. If you plan to race every weekend or push extreme power, stepping up to the Meziere or a high-end Davies Craig unit may be wise.

• Brushless motor design for longer life and less electrical noise.
• Flow rating of 30 GPM meets the needs of most moderate LS builds.
• Comes with a billet aluminum pulley for serpentine belt drive if needed.

Pros: Great balance of performance and price.; Brushless motor is quieter and more efficient.
Cons: Some users report occasional seal leaks after extended use.; Not recommended for extreme endurance racing without upgrades.

3. Davies Craig EWP150: Best for Track Use

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The Davies Craig EWP150 is a premium electric water pump designed for high-performance and racing applications. With a flow rating of 40 GPM, it outperforms most competitors and is capable of cooling LS engines producing over 1000 horsepower. The brushless motor is extremely durable, and when paired with the Davies Craig digital controller, you can maintain precise engine temperatures regardless of load. This pump is a favorite among track enthusiasts and serious builders.

However, the EWP150 pump itself does not include the controller, which is sold separately and adds significant cost. The installation is also more involved, requiring proper mounting, wiring, and hose routing. For a street-driven LS that rarely sees sustained high RPM, the EWP150 may be over-engineered. If you want a simpler plug-and-play solution, consider the Meziere or CSR pumps.

• High flow rate of 40 GPM ideal for high-power LS engines and demanding track sessions.
• Brushless motor with advanced controller allows variable speed control for precise cooling.
• Compact, lightweight design with integrated bypass for easy plumbing.

Pros: Excellent flow and pressure for extreme cooling needs.; Digital controller enables fine-tuning of coolant temperature.
Cons: Requires separate controller (EWP150 is pump only) adding to total cost.; Installation complexity is higher due to wiring and controller integration.

4. FlowKooler Electric Water Pump: Quiet Operation

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The FlowKooler Electric Water Pump is a solid mid-range option for LS owners who prioritize a quiet cabin experience. Our research indicates it flows around 28 GPM, which is adequate for stock to mildly modified LS engines. The ceramic seal and sealed motor contribute to a long service life, and the included hardware simplifies the swap. Owner feedback on Amazon and forums is generally positive for street-driven vehicles.

However, the 28 GPM flow is on the lower side. For engines over 500 horsepower or those used in hot climates, cooling may be marginal. Additionally, a few users mentioned occasional hiccups with the pump not priming consistently. If your LS is a daily driver with moderate power, this pump offers good value and quiet operation. For track use or high output, look elsewhere.

• Designed for quiet operation with a sealed DC motor and dampened mounting.
• Ceramic mechanical seal reduces wear and leak potential.
• Includes O-ring gasket and stainless steel hardware for easy installation.

Pros: Very quiet even at full speed, good for street cars.; Affordable price point without sacrificing quality.
Cons: Lower flow rate may not be sufficient for high-power builds.; Some owners report intermittent flow issues on startup.

5. JEGS Electric Water Pump: Budget Friendly

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The JEGS Electric Water Pump is the most affordable way to convert your LS engine to an electric pump. It provides 25 GPM of flow, enough for stock and lightly modified LS engines used for daily driving or cruising. The brushed motor is serviceable, and the aluminum housing is decently built for the price. Owner reviews on Amazon indicate it works well out of the box and is a popular choice for budget LS swaps.

That said, the brushed motor is inherently less efficient and noisier. Long-term durability is a concern, with some users reporting failure after a year or two of use. The 25 GPM flow is also insufficient for any serious performance driving or high ambient temperatures. If your LS build has over 400 horsepower or sees track time, skip this pump. It is best for a low-budget cruiser or a temporary solution.

• Budget-friendly entry point for LS electric water pump conversion.
• Brushed motor design with replaceable brushes for extended life.
• Direct fit for many LS applications with included gasket.

Pros: Lowest cost option, great for tight budgets.; Simple installation with basic tools.
Cons: Lower flow rate (25 GPM) limits use to mild street engines.; Brushed motor is noisier and less durable than brushless alternatives.

6. Mishimoto Electric Water Pump: Premium Build

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The Mishimoto Electric Water Pump is a premium option that combines a billet aluminum housing with a brushless motor and a built-in digital controller. It flows 32 GPM, which is sufficient for most LS builds up to 700 horsepower. The controller allows you to set target temperatures and monitor coolant temp, making it a comprehensive cooling solution. Owner feedback highlights the excellent build quality and reliable performance.

However, the price is high, and the flow rate is slightly less than the Meziere WP136S. The integrated controller, while convenient, adds complexity and potential failure points. Some users find the LED display too bright at night. This pump is ideal for enthusiasts who want a complete, high-quality system and are willing to pay a premium. For pure reliability and flow, the Meziere remains a strong competitor.

• Billet aluminum housing for superior strength and heat dissipation.
• Brushless motor rated for over 10,000 hours of continuous use.
• Includes a digital controller for adjustable speed and temperature display.

Pros: High-quality billet construction with excellent fit and finish.; Integrated controller simplifies setup and allows precise tuning.
Cons: Premium price point, similar to Meziere but with slightly lower flow.; Controller display can be bright for nighttime driving.

7. Edelbrock Electric Water Pump: Brand Trust

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The Edelbrock Electric Water Pump brings the brand’s reputation for quality to the LS electric pump market. It offers a reliable 30 GPM flow, suitable for street and mild track use. The ceramic seal and sealed DC motor are proven designs, and the pump includes everything needed for installation. Owner feedback on Amazon and forums is positive, with many praising the straightforward installation and consistent performance.

That said, the Edelbrock pump does not stand out in any particular metric. Its flow is average, and the price is higher than the CSR while offering similar specs. For high-horsepower builds, the Meziere or Davies Craig are better choices. This pump is a good choice for those who prioritize brand trust and want a no-fuss upgrade for a daily driver or mild LS swap.

• From a trusted brand in performance cooling, with decades of experience.
• Ceramic seal and sealed motor for leak resistance and long life.
• Direct fit for many LS engines, includes gasket and hardware.

Pros: Reputable brand with good customer support.; Reliable 30 GPM flow for moderate builds.
Cons: Not as high-flow as some competitors for extreme builds.; Price is mid-range but value lags behind CSR.

Frequently Asked Questions

Do electric water pumps work on LS engines?

Yes, electric water pumps are commonly used on LS engines. They eliminate parasitic drag from the mechanical pump, free up horsepower, and allow for better cooling control. Many aftermarket pumps are designed specifically for LS applications and bolt directly to the timing cover.

How much horsepower does an electric water pump free up on an LS?

Depending on the RPM, an electric water pump can free up 10 to 20 horsepower compared to a mechanical pump. The exact gain varies by engine speed and pump design, but the reduction in parasitic loss is significant, especially at high RPM.

Can I use an electric water pump on a street-driven LS?

Absolutely. Many owners use electric water pumps on daily drivers. However, you must ensure the pump has adequate flow for your engine’s cooling needs and that the electrical system (alternator, wiring, relay) can support it. Most pumps are designed for continuous duty.

Do I need a controller for an electric water pump?

Not always. Many pumps run at full speed with a simple on/off switch. However, a controller allows you to vary pump speed based on temperature, improving warm-up time and reducing noise. Some pumps, like the Davies Craig and Mishimoto, include or require a controller for optimal performance.

How do I wire an electric water pump on my LS?

You should use a dedicated relay and fuse, with power from the battery or a high-amp circuit. The pump can be triggered by a switch, a temperature sensor, or a controller. Always follow the manufacturer’s wiring diagram and use appropriate gauge wire (typically 10-12 AWG) to avoid voltage drop.

Our Verdict

After researching and comparing specifications, owner feedback, and durability, our top pick is the Meziere WP136S for its proven reliability and consistent 35 GPM flow. For those seeking the best value, the CSR Electric Water Pump offers a great balance of performance and price. If you need maximum flow for track use, the Davies Craig EWP150 is the best choice, though it requires a separate controller.