California ICC UST Service Technician Practice Exam

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A Positive shut off overfill protection device must stop the flow of fuel when the tank is no more than what percent full?

The correct answer is: 95%

The requirement for a Positive shut off overfill protection device is based on ensuring the safety and integrity of underground storage tanks. According to regulatory standards, this type of device must be capable of stopping the flow of fuel before the tank reaches a critical fill level, thereby preventing overfilling and potential leaks or spills. When a tank is filled to 95% full, there is a reduced margin for error, and the risk of overfilling increases significantly. Stopping the flow at this level ensures that there is adequate space within the tank to accommodate fuel expansion due to temperature changes, as well as providing a buffer to account for inaccuracies in measuring the tank’s fuel level. In this context, the 95% threshold is considered a best practice to ensure that overfill incidents are effectively mitigated, making it the required standard for the activation of the shut-off device. Thus, it is crucial for the overfill protection system to function as intended to protect against environmental contamination and safety hazards.