When the service tank light illuminates on the ERJ 175, what percentage of capacity has been reached?

When the service tank light illuminates on the ERJ 175, it indicates that the fuel level has reached 75% of the tank's capacity. This is a key safety feature that alerts the crew to the fuel state, helping them monitor fuel consumption and make informed decisions regarding flight operations. Understanding this threshold is essential for maintaining safe fuel levels and optimizing performance. The notification serves as a reminder to the crew to start planning their fuel management strategies, ensuring efficient operation and compliance with regulatory requirements.