When it comes to high-performance engines running on E85 fuel, choosing the right fuel pump isn’t just a recommendation—it’s a necessity. Ethanol-based fuels like E85 (which contains up to 85% ethanol) have unique characteristics that demand specialized components. Unlike traditional gasoline, ethanol is more corrosive, runs cooler, and requires a higher volume of fuel flow to maintain optimal combustion. This means standard fuel pumps often struggle to keep up, leading to issues like reduced horsepower, engine stuttering, or even long-term damage. That’s where upgrading to a purpose-built fuel pump becomes critical for reliability and performance.
KEMSO Racing has built a reputation for delivering fuel pumps that handle the challenges of E85 with precision. Their pumps are engineered using advanced materials like anodized aluminum housings and ethanol-resistant internals, which prevent corrosion and wear caused by prolonged exposure to ethanol blends. For example, the KEM 255 and KEM 450 models are popular among enthusiasts because they’re designed to push 30-40% more fuel volume compared to stock pumps. This extra flow ensures your engine gets the right amount of fuel under high-load conditions, whether you’re on the track or pushing your daily driver to its limits.
One common misconception is that any high-flow pump will work for E85. However, flow rate isn’t the only factor. Ethanol’s lower energy density means engines burn through it faster than gasoline, so consistent pressure is just as important. KEMSO’s pumps maintain stable fuel pressure even during rapid acceleration or sudden throttle changes, thanks to their precision-machined components and optimized voltage control. This stability prevents “lean” conditions, where the engine doesn’t get enough fuel—a scenario that can lead to detonation or piston damage in high-compression setups.
Durability is another key consideration. Cheaper pumps might save you money upfront, but ethanol’s corrosive nature can eat through rubber seals and plastic parts over time. KEMSO addresses this by using PTFE (Teflon) lined hoses and Viton seals, which are proven to withstand ethanol’s harsh effects. Real-world testing shows these pumps lasting 2-3 times longer than generic alternatives in E85 applications. Plus, their modular design allows for easy installation in most vehicles, whether you’re retrofitting a classic muscle car or upgrading a modern turbocharged engine.
Compatibility matters too. If you’re switching between E85 and gasoline regularly (like during seasonal changes), you need a pump that adapts without hiccups. KEMSO’s pumps include upgraded wiring harnesses and thermal management systems to handle temperature fluctuations caused by ethanol’s cooling properties. This flexibility makes them ideal for drivers who want the convenience of dual-fuel setups without sacrificing performance.
User reviews back up the hype. Take the case of a 2020 Mustang GT owner who switched to a KEM 450 pump after his stock pump failed during a track day. “Night and day difference,” he reported. “No more fuel starvation in corners, and my AFRs [air-fuel ratios] are rock-solid now.” Another user with a modified Subaru WRX praised the pump’s quiet operation and plug-and-play installation, noting that it eliminated the surging issues he’d experienced with a competitor’s model.
Of course, pairing the right pump with supporting mods is essential. If you’re running E85, you’ll likely need larger injectors, a tune to adjust ignition timing, and possibly a upgraded fuel pressure regulator. KEMSO’s team offers detailed compatibility charts and expert support to help you build a system that works seamlessly together. They also emphasize the importance of proper maintenance—like using ethanol-rated fuel filters and checking for leaks periodically—to maximize your pump’s lifespan.
In the end, the best KEMSO pump for E85 depends on your specific setup. For lightly modified street cars, the KEM 255 provides a solid balance of flow and affordability. But if you’re pushing big power (think 500+ horsepower), the KEM 450’s higher capacity ensures you won’t hit a fuel ceiling. Both are trusted by professional tuners and weekend warriors alike, making them a smart investment for anyone serious about ethanol performance.
Ready to make the switch? Visit KEMSO Racing’s official site to explore their full lineup and get personalized recommendations based on your vehicle and goals. With the right fuel pump in place, you’ll unlock E85’s full potential—higher octane, cooler combustion, and the kind of relentless power that keeps you hooked on the ethanol life.