Which test requires a vacuum check according to NFPA 1901?

The correct answer is the pump certification test, which mandates a vacuum check according to NFPA 1901. This test is crucial for ensuring that the fire pump maintains its ability to generate a vacuum, demonstrating that it can effectively draw water from a static source. A proper vacuum is essential for the pump's operational integrity, as it influences the pump's performance during actual emergency situations.

Conducting a vacuum check as part of the pump certification test helps verify that there are no leaks in the pump system and that all components function as designed. It ensures the equipment's reliability and safety, which are critical for firefighting operations.

In contrast, while hydrostatic tests, pumping tests, and engine speed checks are important for assessing various aspects of fire apparatus and equipment, they do not specifically require a vacuum check as part of their procedures. Each of those tests serves its purpose, focusing on different operational capabilities and performance metrics, but it is the pump certification test that uniquely emphasizes the need for this vital check.