What is the required maximum fill level at which a positive shut-off overfill prevention device must stop fuel flow?

The required maximum fill level at which a positive shut-off overfill prevention device must stop fuel flow is 95%. This standard is in place to ensure safety and prevent overfilling of storage tanks, which can lead to spillage and potential environmental hazards.

Setting the maximum fill level at 95% provides a buffer that accounts for variations in fuel expansion, potential malfunctions, and inaccuracies in measuring instruments. By stopping at this level, the device helps maintain a safe operational environment.

Additionally, adhering to this standard can help operators comply with various regulations concerning fuel storage safety, further emphasizing the importance of implementing effective overfill prevention strategies.