What is a common issue that can lead to vapor recovery system failures?

Blockages in vapor lines due to dirt or condensation is a common issue that can lead to vapor recovery system failures. In vapor recovery systems, the efficient movement of vapors is crucial for preventing emissions and ensuring that the system operates correctly. When dirt, debris, or condensation accumulate in the vapor lines, they can restrict or completely block the flow of vapors. This blockage can cause pressure imbalances, leading to a failure in the system to recover vapors effectively. As a result, the system can fall short of environmental compliance requirements, create safety hazards, and impact the performance of equipment in the system.

The other options highlight other potential concerns but do not directly focus on the primary mechanical failure aspect associated with vapor recovery systems. While inadequate fuel supply, excessive fuel pressure, and frequent changes in fuel type can lead to operational complications, they do not specifically entail the risk of blockages and subsequent failure within the vapor lines and recovery system itself. Effective vapor recovery relies on ensuring that pathways are clear and unobstructed to facilitate proper vapor management.