California ICC UST Service Technician Practice Exam

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What should be checked daily in ethanol tanks to prevent issues?

Temperature levels
Water level
Fuel quality
Vapor pressure

The correct answer is: Water level

Daily checks on water levels in ethanol tanks are essential for several reasons. Ethanol is hygroscopic, meaning it readily absorbs moisture from the environment. This can lead to water accumulation in the tank, which can cause various operational issues such as phase separation, reduced fuel efficiency, and potential damage to equipment. When water mixes with ethanol, the resulting solution can become less effective as a fuel, affecting performance and leading to problems like engine knocking or starting difficulties in vehicles that use the fuel. Monitoring the water level regularly helps to identify any emerging issues early, allowing for appropriate measures to be taken to remove the water before it causes significant problems. While temperature levels, fuel quality, and vapor pressure are also important aspects of fuel tank management, they do not address the specific risks associated with water intrusion in ethanol tanks as directly as monitoring water levels does. Therefore, focusing on the water level is crucial for maintaining the integrity and performance of the fuel storage system.