E85 Fuel Tester Tool

The Holley E85 Fuel Tester Tool is an essential diagnostic instrument for any enthusiast or professional tuner running ethanol-blended fuel systems. As modern performance vehicles increasingly rely on E85 compatibility, verifying fuel quality and ethanol content becomes critical to engine safety and tuning accuracy. This compact, handheld tester eliminates guesswork at the pump, ensuring your fuel meets specification before it enters your fuel system.

Holley engineered this tool to quickly and reliably measure ethanol concentration in E85 and blended fuel samples, a function vital for calibrating fuel injector pulse width, ignition timing, and boost levels on tuned engines. The simple, durable design requires no batteries or digital displays—just a straightforward comparison method that works in any shop or track environment. Mechanics and tuners trust this instrument because it provides instant feedback without electronic dependency, making it indispensable during initial fuel system diagnosis, dyno sessions, and pre-event vehicle checks.

This tester is ideal for owners of turbocharged, supercharged, or naturally aspirated performance vehicles that run E85 as part of their fuel strategy. Whether you're validating fuel quality before a road course event, diagnosing cold-start or lean-condition issues, or commissioning a new fuel system build, the Holley E85 Fuel Tester Tool is a must-have for ensuring optimal performance.